Aetechron 7224 Operator's Manual
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Aetechron 7224 Operator's Manual

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7224
Operator's Manual
Single-Channel Industrial Amplifier for Demanding, High-Power Systems
574.295.9495 |
www.aetechron.com
2507 Warren Street, Elkhart, IN 46516

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  • Page 1 7224 Operator’s Manual Single-Channel Industrial Amplifier for Demanding, High-Power Systems 574.295.9495 | www.aetechron.com 2507 Warren Street, Elkhart, IN 46516...
  • Page 2 This Declaration of Conformity is issued under the sole responsibility of AE Techron, Inc., and belongs to the following product: Equipment Type: Industrial Power Amplifiers Model Name: 7224 EMC Standards: EN 61326-1: 2013 – Electrical Equipment for Measurement, Control and Laboratory use —...
  • Page 3 2507 Warren St. Elkhart, IN, 46516, U.S.A. receive an authorization to return the product for (574) 295-9495 service. All components must be shipped in a factory www.aetechron.com pack or equivalent which, if needed, may be obtained...

  • Page 4: Table Of Contents

    Contents 1 Introduction ............................5 1.1 Features ..........................5 1.2  Configuration Options......................5 2 How to Use this Manual .........................6 2.1  Determine Your Amplifier Version ..................6 2.2 Safety First ..........................7 3  Amplifier Unpacking and Installation ....................8 3.1  Unpacking ..........................8 3.2 Installation ..........................8 4  Connections and Startup .......................9 4.1  Other Operation Modes and Configurations................9 4.2  Connecting the Load ......................9 4.3 ...

  • Page 5: Introduction

    7224 OPERATOR’S MANUAL – SECTION 1 Figure 1.1 – 7224 Front Panel 1 Introduction Performance Overview* Congratulations on your purchase of the 7224 AE  Techron power amplifier—one of the most precise  Small Signal Bandwidth (8V p-p) DC - 600 kHz power amplifiers ever produced for industrial ap- plications and testing. The 7224 amplifier is built  Max Continuous Power, 20 kHz 900 watts RMS and tested to the most stringent quality standards  For High-Power Applications to: 100 kHz for long life and outstanding performance. The AE  Techron brand is known throughout the world for  DC Power: 16A at 13.5 VDC its robust precision amplifiers as well as its product ...

  • Page 6: How To Use This Manual

    7224 OPERATOR’S MANUAL – SECTION 2 2 How to Use this Manual 2.1 Determine Your Amplifier Version Version C has external DIP switches on the  This manual contains setup and operating informa- amplifier’s back panel, but does not have the two  tion for several versions of the 7224 amplifier. DB9 ports. It is configured using the external DIP  Version A is a 7224 amplifier with a serial num- swiches. ber ending in -2785 or lower. Version A units with  Version D has both external DIP switches and the  a serial number ending in -2628 and lower have  two DB9 ports on the back panel. It is configured  a removable access panel in the amplifier’s top  using the external DIP swiches. cover. The amplifier does not have external DIP  switches or the two DB9 ports on the back panel. It  See Figures 2.1 and 2.2 for assistance in identify- is configured using jumpers located on the ampli-...

  • Page 7: Safety First

    7224 OPERATOR’S MANUAL – SECTION 2 VERSION B Units with internal DIP switches. Remove the top cover to access the DIP switches. VERSION C Units with external DIP switches (on amplifier back panel). VERSION D Units with external DIP switches (on amplifier back panel). The amplifier also provides two DB9 Interconnect connectors on the amplifier back panel.

  • Page 8: Amplifier Unpacking And Installation

    Power Cord • 7224 Operator’s Manual and Quick Start sheet • CAUTION Do not operate the amplifier in a small sealed chamber of any kind. Improper operations and overheating will result. * The earliest version of the 7224 has an aluminum chassis. Information subject to change 96-8006348_05-31-2022...

  • Page 9: Connections And Startup

    7224 OPERATOR’S MANUAL – SECTION 4 Figure 4.1 – 7224 Back Panel (Version D shown) 4 Connections and Startup first be wired and tested individually in Controlled- This section details the wiring and startup pro- Voltage mode to ensure proper operation.  cedures for a single 7224 amplifier operating in  Controlled-Voltage mode (factory default). Before  For Series or Push/Pull operation in Controlled- connecting the amplifier, make sure the AC power  Voltage mode, refer to the topic “Multiamp Sys- cord is unplugged.  tems for Increased Current or Voltage” in the Ap- plications section of this manual for information WARNING on Series and Push/Pull system configuration. ELECTRIC SHOCK HAZARD. For Series or Push/Pull operation in Controlled- Output potentials can be lethal.

  • Page 10: Connecting The Input Signal

    7224 OPERATOR’S MANUAL – SECTION 4 Always use the appropriate wire size and insula- card can easily be removed and replaced with  tion for the maximum current and voltage expected  alternate SIM cards designed for special applica- at the output. Never connect the output of the  tions, when required. amplifier to any other model amplifier, power sup- The SIM BNC card provides both an unbalanced  ply, signal source, or other inappropriate load; fire  Input BNC jack and a balanced Input “WECO”  can result. terminal block connector. (Mating connector for the  WECO connector is provided.) Connect your input  WARNING signal to the unbalanced or balanced input con- nector as shown in Figure 4.3. Use cables that are ELECTRIC SHOCK HAZARD. high quality and shielded to minimize noise and to  Output potentials can be lethal. Make guard against possible feedback. connections only with AC Power OFF and input signals removed.

  • Page 11: Other Back Panel Controls And Connectors

    7224 OPERATOR’S MANUAL – SECTION 4 connecting multiple amps in push/pull or parallel  configurations. See the Applications section of this manual for more information. INTERLOCK I/O CONNECTOR: The Interlock Connector can be used to provide remote control  and monitoring of the amplifier, and for connecting  amps in multiamp configurations. See the Applica- tions section of this manual for information. 4.5 Connecting the AC Supply The power cord connects to a standard 20A 3-pin  IEC-type male connector on the back panel (see  Figure 4.5). Make sure the Breaker/Switch on the  front panel is switched to the OFF (O) position.  Figure 4.4 – Input Select Switch Settings for  Unbalanced or Balanced Input Connectors Make sure the power cord is inserted and seated  fully into the IEC connector by moving it slightly ...

  • Page 12: Amplifier Operation

    7224 OPERATOR’S MANUAL – SECTION 5 5 Amplifier Operation 5.1 Front-Panel Controls This section provides an overview of Front-Panel  controls and indicators found on the 7224. 5.1.1 Power Switch The Power Switch controls the AC mains power to  the amplifier. Switch to the ON position (|) to turn  Figure 5.1 – Power Switch the amplifier on. Switch to the OFF position (O) to  turn the amplifier off. See Figure 5.1. The Power Switch also serves as a Breaker. When  the Breaker is tripped, the Power Switch moves to  a neutral position between ON and OFF. To reset  the Breaker, turn the amplifier OFF (O) and then  turn it back ON (I). Figure 5.2 – Gain Control 5.1.2 Gain Control factory-default setting and configure the amplifier  The Gain Control Knob increases/decreases the  to power-up in Standby/Stop mode, please see the  gain from 0 – 100% of the overall Gain. Turn the  Advanced Configuration section.

  • Page 13: Front-Panel Indicators

    7224 OPERATOR’S MANUAL – SECTION 5 If an amplifier is disabled using a Remote Standby  dition has been cleared and the amplifier has been  switch, the amplifier will be placed in Remote  configured for startup in Run mode. If the amplifier  Standby mode. To return the amplifier to a Run  has been configured for startup in Standby/Stop  condition, release the Standby condition using the  mode, pressing the Reset button will place the  remote switch. See the Applications section of amplifier in Standby/Stop mode. Press the Enable  this manual for more information on remote ampli- button to return the amplifier to Run mode.  fier operation. 5.2 Front-Panel Indicators Standby/Fault mode (Standby and one or more 5.2.1 Main Status Indicators Fault LEDs lit): The amplifier has been placed in  Four Main Status indicators are located on the am- Standby due to an Output, Overload, Over Temp ...
  • Page 14 7224 OPERATOR’S MANUAL – SECTION 5 Figure 5.5 – Main Status Indicators Indicator is lit Indicator is not lit Indicator may be lit Main Status Indicators State of Operation Action Needed to Return to Run Mode Run mode: The amplifier’s high-voltage  transformers are energized and the unit will  amplify the input signal. Run mode is initiated  Ready by: (1) the Enable push button, or (2) when  Standby the amplifier powers up in Run mode (factory   Stop default). See the Advanced Configuration...
  • Page 15 7224 OPERATOR’S MANUAL – SECTION 5 Figure 5.6 – Fault Status Indicators Indicator is lit Indicator is not lit Indicator may be lit Action Needed to Clear Fault Main Status Fault Status Condition and Return to Indicators Indicators State of Operation Run Mode Output Fault status: This indicates This fault condition cannot be cleared that an Output Fault condition has oc-...

  • Page 16: Back-Panel Controls And Connectors

    7224 OPERATOR’S MANUAL – SECTION 5 Back-Panel Controls CAUTION and Connectors This section provides an overview of Back-Panel  Turn the amplifier OFF before chang- controls and connectors found on the 7224. Please  ing DIP switch positions. Some switch changes could result in amplifier damage. refer to Figure 5.7 for visual locations. AC Supply – Standard 20 amp 3-pin IEC-type  DIP Switches* (Versions B, C and D only): The eight back-panel DIP switches can be used to en-...

  • Page 17: Advanced Configuration

    Version A main board configuration instructions. for DIP switch settings and descriptions. CAUTION *These features not available on Version A 7224 amplifiers. The gain on Version A amplifiers may be configured as vari- able (default) or fixed, but the 6:1 gain setting is not available. Turn the amplifier OFF before chang- **DIP switches are not available on Version A.
  • Page 18 SW#6: Master/Follower* of a 68.1 kΩ resistor in series with a 47 nF capaci- When the Master/Follower DIP switch is in the Up tor. Place the DIP switch in the Down position to  position (default), the amplifier will function as a  select CC2 network. This network is unpopulated,  stand-alone amplifier or as a Master amplifier in  but can be populated with a custom compensation  a multi-amp system. When this switch is in the  Down position, the amplifier will function as a Fol- *On Version A 7224 amplifier, this function is configured on lower amplifier in a multi-amp system. the amplifier main board. See Appendix B for more informa- tion. Information subject to change 96-8006348_05-31-2022...

  • Page 19: Internal Configurations

    7224 OPERATOR’S MANUAL – SECTION 6 For more information on multi-amplifier system  Main Board (Versions B, C and D only): configuration and operation, see the Applications Install a custom compensation network for use  • in Controlled-Current operation,  section. Configure the amplifier to operate with a fixed  SW#7: Voltage Input (Low/High) • gain instead of the default variable gain,  When the Voltage Input DIP switch is in the Up Configure the amplifier to enter Standby on  position (default), the voltage input is set to line  • startup instead of entering Run mode (default) level and the amplifier can be configured for use  Configure the amplifier to enter Standby when  in a Parallel or Push/Pull multi-amp system. When  • an Overload fault condition occurs.  this switch is in the Down position, voltage input is  set to high, and the amplifier can be configured for  Power Supply Board (All Versions): use in a Series multi-amp system. ...
  • Page 20 #2 Phillips screwdriver tion” in the Applications section of this manual. Procedure Enable/Stop on Power-up 1. Remove power from the amplifier and discon- The 7224 amplifier will power-up to Run Mode  nect any load from the amplifier outputs. Wait a  when a shunt is placed across pins 1 and 2 on the  minimum of three minutes to allow the ampli- Enable/Stop jumper (default setting). See Figure fier’s capacitors to discharge. 6.3. To cause the 7224 amplifier to enter Standby  2. Remove the amplifier’s front grill cover by  (Stop Mode) on power-up, place the shunt across  firmly pulling the grill cover away from the front  pins 2 and 3.  panel. The grill is held by magnets. 3. Use the Phillips screwdriver to remove nine (9)  screws: a.  Three (3) screws from each side b.  One (1) screw from the back c.  Two (2) screws from the front (after the grill  cover is removed.
  • Page 21 7224 OPERATOR’S MANUAL – SECTION 6 Fixed or Variable Gain The 7224 amplifier ships with an enabled Gain  forms observed at the amplifier input and output.  Control knob, which is located on the amplifier  When a distortion between the two waveforms front panel. To disable the Variable Gain control  of more than 0.5% occurs, the IOC circuit will  and set for a Fixed Gain, locate the Gain Control  activate, and the Overload LED will light, but the  Bypass jumper, remove the gain control wire, and  amplifier will continue to operate. To configure the  place a shunt across the two pins at that location.  7224 to move to Standby (Fault mode) when the  See Figure 6.4. IOC circuit is activated, locate the Overload Latch  (see Figure 6.5) and place a shunt across the two  Standby on Overload pins of the jumper. The 7224’s IOC (Input/Output Comparator) Distor- tion Alert circuit continuously compares the wave- Figure 6.4 – Configure for Fixed or Variable Gain Figure 6.5 – Configure for Standby (Fault Mode) on Overload Information subject to change...
  • Page 22 7224 OPERATOR’S MANUAL – SECTION 6 6.2.3 Configuration Settings Located on During normal operation, the 7224 will use the  the Power Supply Board (All Versions) signal received at input to calculate the expected  voltage requirements of the application. When  The following custom settings are configured on  voltages higher than 90V are required, the trans- the Power Supply Board: formers will automatically be switched to a series Amplifier Voltage Potential setting (high current  • configuration to provide up to 180V output. or high voltage) Bi-Level Power Supply setting When the 7224 senses that the voltage required  • has dropped below the 90V limit, the transformers  Power Supply Settings for Increased will automatically be returned to a parallel configu- Voltage or Current ration, reducing heat output and increasing operat-...
  • Page 23 7224 OPERATOR’S MANUAL – SECTION 6 LOAD (ohms) BI-LEVEL POWER SUPPLY OUTPUT RECOMMENDED VOLTAGE RAILS APPLICATIONS Continuous Pulse SWITCH High current operation 0.5 - 1 0.25 - 0.75 Mid-level operation 45-90 2 - 4 1 - 2 Auto High Not recommended Fastest rise to >45V; <90V 2 - 4 1 - 2 High voltage operation...
  • Page 24 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.9 – Location of Amplifier High-Voltage  Figure 6.10 – J3 and J7 Plug Locations for  High-Current Output Transformer Sockets Figure 6.11 – J4 and J8 Plug Locations for  High-Voltage Output To access and change the Bi-Level Power Switch,  5. Move the black switch to the desired setting. If  follow these steps: necessary, use a pointed, non-metallic object  (such as a pen) to help in moving the switch. 1. Locate the SIM Input Card on the right side of  the rear panel of the amplifier.   a.  Automatic – Left 2. Using a #2 Phillips screwdriver, remove the two  screws located at the edges of the SIM card.    b.  Low – Middle 3. Keeping the ribbon cable attached, remove the    c.  High – Right SIM card from the amplifier until it is completely  clear from the card bay. 4. Locate the Bi-Level Power Switch, S1, a black,  three-position switch at the rear of the card ...

  • Page 25: Applications

    7224 OPERATOR’S MANUAL – SECTION 7 7 Applications Remote Enable/Standby The procedures outlined in this section assume  • Temperature monitor competence on the part of the reader in terms of  • amplifier systems, electronic components, and  • Current monitor Voltage monitor good electronic safety and working practices. • Figure 7.1 maps the pins used for these applica- 7.1 Remote Status and Control using tions. NOTE: Both 9-pin D-Sub connectors have the  the Interconnect Ports (Version D same pin-outs and either port can be used for remote  only) applications. AE Techron 7224 amplifiers come with two back- panel female 9-pin D-Sub connectors that can be  used to provide remote control and monitoring of  the amplifier.  The information provided here will instruct you in  the wiring of several control and status applica- Figure 7.1 – Remote Status and Control Pin-outs ...
  • Page 26 7224 OPERATOR’S MANUAL – SECTION 7 7.1.2 Remote Monitoring of Temperature Using one of the 9-pin D-Sub connectors located  on the back panel of the amplifier, you can remote- ly monitor the temperature at the heat-sinks of the  amplifier.  Remote Monitoring of Temperature Purpose: Use a voltage meter to monitor tempera- ture at the heat-sinks. Method: Connect a voltage meter to monitor the  temperature at the heatsinks of the amplifier. Con- nect across Temp (PIN 4) and Ground (PIN 3 or 6).  See Figure 7.3. Figure 7.3 – Remote Temperature Monitor Signal Type: AC Level: (VDC X 100) - 273 = degrees Celsius Most digital multimeters have an input impedance  IMPORTANT: This circuit has a 1K build-out resis- of 1 megohm and would work well for this applica- tor. Make sure the monitor function has sufficient  impedance to avoid accidentally influencing status.   ...

  • Page 27: Remote Status And Control Using The Sim Interlock I/O Connector (All Versions)

    7224 OPERATOR’S MANUAL – SECTION 7 7.2 Remote Status and Control using the SIM Interlock I/O Connector (All Versions) D-Sub connector. This connector can be used to provide remote control and monitoring of the  AE Techron 7224 amplifiers come with a SIM-BNC  amplifier.  input module that also contains a female, 25-pin  The information provided here will instruct you in  the wiring of several control and status applica- tions including: Run/Standby status • Amplifier status: Run, Over-temperature, Over- • load, Overvoltage; and Reset after Overload  error Remote Enable/Standby • • Current monitor Temperature monitor •...
  • Page 28 7224 OPERATOR’S MANUAL – SECTION 7 7.2.2 Remote Amplifier Status & Reset of the amplifier when it is forced to Standby due to  The SIM Interlock I/O Connector can be used to  Over-load conditions.  create a circuit to monitor remotely one or more Use a male, 25-pin D-Sub connector and high- amplifier conditions, including Run status, Over- quality wire to build the circuit. Figure 7.8 sche- temperature, Overload and Overvoltage. The cir- matic details the circuit and components required  cuit can also be constructed to allow remote reset for all status and reset functions.
  • Page 29 7224 OPERATOR’S MANUAL – SECTION 7 Remote Signal of OverVoltage Condition Remote Signal of Run Condition Purpose: LED, when lit, signals Run state.  Purpose: LED, when lit, signals Overvoltage condition.  Method: Use a 6mA series resistor of 4.02K-ohm  Method: Use a 6mA series resistor of 4.02K-ohm  for LED or OPTO, tie Run (PIN 12) to –24V source  for LED or OPTO, tie OverVoltage Out (PIN 24) to  (PIN 13).  –24V source (PIN 13).  Signal Type: DC Signal Type: DC Level when Asserted: –24V Level when Asserted: –24V Level when Deasserted: 0V...
  • Page 30 7224 OPERATOR’S MANUAL – SECTION 7 When Interlock (PIN 4) is shorted to Digital Ground  IMPORTANT: The amplifier must be configured for  (PIN 17), amplifier is placed in Standby mode.  Ready mode at startup (factory default) or the Run  When switch is open, amplifier is released to the  button must be pressed at the amplifier front panel  at startup. The Remote Enable/Standby circuit will  Run condition. Signal Type: DC not function if the Startup to Standby Latch has  Level when Asserted: 0 to 8 V been activated on the amplifier. Level when Deasserted: 10 to 15 V 7.2.4 Remote Monitoring of Current Using the SIM-BNC Interlock connector located on  the back panel of the amplifier, you can remotely  monitor current output.  Remote Monitoring of Current Output Purpose: Use a voltage meter to monitor output  current.
  • Page 31 7224 OPERATOR’S MANUAL – SECTION 7 7.2.5 Remote Monitoring of Tempera- ture Using the SIM-BNC Interlock connector located on  the back panel of the amplifier, you can remotely  monitor the temperature at the heat-sinks of the  amplifier.  Remote Monitoring of Temperature Purpose: Use a voltage meter to monitor temper- ature at the heat-sinks. Method: Connect a voltage meter to monitor the  temperature at the heatsinks of the amplifier. Con- nect across PIN 9 (TEMP MONITOR) and PIN 10  (Sampled Common). See Figure 7.12. Signal Type: DC Level: (VDC * 100) - 273 = degrees Celsius IMPORTANT: This circuit has a 1K build-out resis- tor. Make sure the monitor function has sufficient  Figure 7.12 – Remote Monitoring of Temperature impedance to avoid accidentally influencing status.    Most digital multimeters have an input impedance  of 1 megohm and would work well for this applica- tion.

  • Page 32: Controlled Current Operation

    7224 OPERATOR’S MANUAL – SECTION 7 7.3 Controlled Current Operation The procedures outlined in this section assume  competence on the part of the reader in terms of  amplifier systems, electronic components, and  good electronic safety and working practices. 7.3.1 Controlled-Voltage vs. Controlled- Current Modes of Operation AE Techron 7224 amplifiers can be field-configured  to operate as Voltage Amplifiers (Voltage-Con- Figure 7.14 – Input to Output Comparison,  trolled Voltage Source) or as Transconductance Controlled-Voltage Operation Amplifiers (Voltage-Controlled Current Source).  The mode selection is made via a DIP switch on  the amplifier’s back panel. See the Advanced Configuration section for more information. When configured as a Controlled-Voltage source (voltage amplifier), the amplifier will provide an  output voltage that is constant and proportional  to the control (input) voltage. If the load’s imped- ance changes, the amplifier will seek to maintain  this ratio of input to output voltage by increasing or  Figure 7.15 – Input to Output Comparison,  decreasing the current it produces, as long as it is ...
  • Page 33 7224 OPERATOR’S MANUAL – SECTION 7 for some applications, the compensation setting  ing in Controlled Current (CC) mode, the amplifier  may also be adjusted in the field. The following  load becomes an integral part of the system. In  section describes methods for determining and  order to ensure system stability and to control setting proper compensation when operating in  available bandwidth, compensation via an RC  network is required for CC operation.  Controlled-Current mode. 7.3.3 Controlling Compensation for Versions B, C and D only: Complete the following  CC Operation steps to compensate your amplifier for operation in  AE Techron 7224 amplifiers can be configured for  CC mode safely and effectively. either Controlled Voltage (CV) or Controlled Cur- Version A: Please refer to Appendix B for instruc- rent (CC) mode of operation. When operating the ...
  • Page 34 7224 OPERATOR’S MANUAL – SECTION 7 STEP 3: Determine if Default or Custom Compensation is Required. 5 ohms, then you must calculate your required  If your load inductance is between 200 microHen- compensation. If, after calculating your required  ries and 1 milliHenry, and your load resistance compensation, you determine that the default com- is less than 5 ohms, then you can likely use the default compensation provided by the amplifier’s ...
  • Page 35 7224 OPERATOR’S MANUAL – SECTION 7 Amplifier Top Cover Removal 4. Lift the cover straight up to remove it and set it  Tool Required aside. #2 Phillips screwdriver 5. To replace the top cover, slide the cover in to  place on the amplifier and replace the nine  DANGER screws. 6. Position the grill near the front panel and snap  Uninsulated terminals with AC mains into place. potential are exposed when the top cover is removed. Do not proceed until the amplifier has been turned off and the CAUTION AC Mains has been disconnected.
  • Page 36 7224 OPERATOR’S MANUAL – SECTION 7 sure the amplifier is turned OFF. Then, locate  (SW#2). Move the switch to the Down position to  back panel Compensation (CC1/CC2) DIP switch  enable the path to the custom network (CC2).  STEP 7: Optimizing the Compensation Values. If the output current waveform is rounded, the  Remember the load you are connecting is a circuit is overdamped: You have too little compen- part of the system and the amplifier should not sation and should increase resistance (see Figure be turned on without the load being connected.

  • Page 37: Multi-Amp Systems For Increased Voltage Or Current

    The 7224 amplifier may be used with other 7224  One Master Amplifier amplifiers to increase voltage or current. Because  the internal circuitry of a 7224 amplifier is not  Typical multiamp configurations require one ampli- connected to chassis ground, the amplifier is well  fier configured as a Master amplifier, and all other  suited for use in series or parallel with other 7224  amplifiers in the system configured as Follower  amplifiers. amplifiers. Do not operate with more than one  Master in your multiamp system unless instructed  7224 multi-amplifier configurations include: Push/ by AE Techron Technical Support. Pull, Series, or Parallel. Two 7224 amplifiers can  Use Only 7224 Amplifiers of the Same be wired in a Push/Pull configuration for approxi- Version mately double the output voltage. Up to three 7224  Use only AE Techron 7224 amplifers of the same  amplifiers may be configured in series for up to  version to construct a 7224 multiamp system. Do  three times the continuous output voltage. Up to  not combine different versions or models of AE  four 7224 amplifiers may be configured in parallel  Techron amplifiers in the same system or use am- for up to four times the continuous current output.  plifiers made by another manufacturer in a 7224  See Figure 7.22 for the approximate output levels  multiamp system. Such improper connections ...
  • Page 38 NOT ground-refer- enced. Accessories Required For routine, Controlled-Voltage  applications, Push/ Pull amplifier systems can be configured using two  Figure 7.23 – DIP Switch Settings for  standard 7224 amplifiers and the following acces- Push/Pull Configuration sory available from AE Techron: 7224/7234 Push/Pull DB9 Cable (part number only need to adjust these settings on the Master  69-8005917) amplifier.  SW#3 - Low-Pass Filter (50 kHz): Set DIP switch  Please contact AE Techron’s Sales Department #3 on the Master amplifier in the DOWN position to  for more information. enable. Amplifier Labeling SW#4 - Gain (20 / 6): Set DIP switch #4 on the ...
  • Page 39 1 2 3 4 5 6 7 8 KEY FOR DIP SWITCH SETTINGS: SYSTEM REQUIREMENTS: WECO REQUIRED (2) 7224 Amplifiers DEFAULT (1) 7224 PUSH/PULL DB-9 CABLE KIT OPTIONAL 3110A or other (69-8005917) NOT RECOMMENDED Signal Generator Figure 7.24 – Configuration and Wiring for Push/Pull Operation (Version D only) 3. Using wiring appropriate for your application,  4. Using wiring appropriate for your application ...
  • Page 40 Accessories Required For routine, Controlled-Voltage  applications, Par- Figure 7.25 – DIP Switch Settings for  allel amplifier systems can be configured using up  Parallel Configuration to four standard 7224 amplifiers and the following  accessories available from AE Techron: back-panel DIP switches for the Master and all  Follower amplifiers. 7224/7234 Parallel Wiring Kit (2-amp) (part number 69-8005918) Optional DIP Switch Settings 7224/7234 Parallel Wiring Kit (3-amp) (part DIP switches 3, 4 and 8 control amplifier func- number 69-8005919) tions that can be optionally enabled for use during  7224/7234 Parallel Wiring Kit (4-amp) (part multi-amp operation. The Master amplifier controls  number 69-8005920) these functions for the multi-amp system, so you ...
  • Page 41 7224 OPERATOR’S MANUAL – SECTION 7 PARALLEL CONFIGURATION 7224 AMPLIFIERS 7224 AMP #4 - FOLLOWER AMPLIFIER OUTPUTS INPUT & MULTIAMP CONNECT OUTPUT COMMON 2.7-ohm resistor CHASSIS GROUND DIP SWITCH SETTINGS: 1 2 3 4 5 6 7 8 7224 AMP #3 - FOLLOWER AMPLIFIER OUTPUTS INPUT &...
  • Page 42 3. Connect from a signal generator to the BNC or  (Master, Follower #1, Follower #2). WECO signal input connector on the Master  Make sure all amplifiers are disconnected from amplifier’s back panel SIM-BNC input card. 4. Using the red and black output cables from the  AC power. 7224/7234 Parallel Wiring Kit, connect one CAUTION cable leg of the black (ground) output cable to  each of the amplfier’s back-panel SAMPLED  Turn the amplifier OFF before chang- COMMON connectors, and then connect the  ing DIP switch positions. Some switch changes could result in amplifier damage.
  • Page 43 7224 OPERATOR’S MANUAL – SECTION 7 SW#3 - Low-Pass Filter (50 kHz): Set DIP switch  Jumper Configuration: For all except one SIM- #3 on the Master amplifier in the DOWN position to  BNC OPTOC input cards, remove the shunts from  Jumpers 4 and 5 to configure the cards to function  enable. as Followers. Place a label reading “Master” or  SW#4 - Gain (20 / 6): Set DIP switch #4 on the  “Follower” on the front of each input card to clarify  Master amplifier in the DOWN position to change  the function of each card. the system gain to 6.. SW#8 - DC/AC Coupling: Set DIP switch #8 on  Jumper J12: When Open, this option lifts the  the Master amplifier in the DOWN position to block ...
  • Page 44 3. Unplug the ribbon cable from the back of the  1. Connect the DB9M Series Cable (part number  input card; remove the card from the amplifier  69-8004125) from the MASTER OUTPUT con- card bay. TWO AMPLIFIERS 7224 IN SERIES CONFIGURATION AMPLIFIERS 7224 AMP #2 - FOLLOWER AMPLIFIER OUTPUTS INPUT & MULTIAMP CONNECT OUTPUT COMMON REMOVE DIP SWITCH SETTINGS: 2.7-ohm CHASSIS 1 2 3 4 5 6 7 8...
  • Page 45 7224 OPERATOR’S MANUAL – SECTION 7 THREE AMPLIFIERS 7224 IN SERIES CONFIGURATION AMPLIFIERS 7224 AMP #3 - FOLLOWER AMPLIFIER OUTPUTS INPUT & MULTIAMP CONNECT OUTPUT COMMON REMOVE DIP SWITCH SETTINGS: 2.7-ohm CHASSIS 1 2 3 4 5 6 7 8 resistor GROUND 7224 AMP #2 - FOLLOWER AMPLIFIER OUTPUTS INPUT &...
  • Page 46 7224 OPERATOR’S MANUAL – SECTION 7 7.4.5 Multiamp System Start-up mode (Ready and Standby LEDs lit) and remain  Procedure (All Versions) in Remote Standby mode until all amplifiers in the  1. Turn down the level of your signal source. system have been powered on. The system will  2. Make sure the Gain Control on both amplifiers  automatically proceed to Run mode when all am- is turned fully clockwise (100%). plifiers in the system are powered on and achieve  3. Depress the POWER switches on both the  Remote Standby mode. Master and the Follower amplifiers (in any  In multi-amp systems that have been configured to  order) to turn the power ON.  start up in Stop mode, when an amplifier is pow- 4. Wait for the yellow READY and green RUN  ered on, the amplifier will be placed in Standby/ LEDs to illuminate on both amplifiers. Stop mode (Stop and Standby LEDs lit). When  5. Adjust the input signal level to achieve the  the Enable button is pressed on each amplifier,  desired output level. that amplifier will be placed in Remote Standby  7.4.6 Multiamp System Operation (All mode (Ready and Standby LEDs lit) and remain ...
  • Page 47 7224 OPERATOR’S MANUAL – SECTION 7 Figure 7.33 – Main Status Indicators for Multi-Amplifier Systems Indicator is lit Indicator is not lit Indicator may be lit Main Status of One or Main Status of More Amps in Other Amps in Action Needed to Return to...
  • Page 48 7224 OPERATOR’S MANUAL – SECTION 7 Figure 7.34 – Fault Status Indicators for Multi-Amplifier Systems Indicator is lit Indicator is not lit Indicator may be lit One or More Amps in System Other Amps in System Action Needed to Clear Fault Main Status Fault Status...
  • Page 49 7224 OPERATOR’S MANUAL – SECTION 7 One or More Amps in System Other Amps in System Action Needed to Clear Fault Main Status Fault Status Main Status Fault Status Condition and Re- Indicators Indicators Indicators Indicators State of Operation turn to Run Mode Over Temp status: To reset after an Over ...

  • Page 50: Maintenance

    7224 OPERATOR’S MANUAL – SECTION 8 To clean the amplifier grills and filter, complete the  8 Maintenance following steps: Simple maintenance can be performed by the user  1. Turn completely down (counter-clockwise) all  to help keep the equipment operational. The fol- level controls and turn the amplifier OFF. Dis- lowing routine maintenance is designed to prevent  connect the amplifier from its power source. problems before they occur. See the Trouble- 2. Using a vacuum cleaner, vacuum the front ven- shooting section, for recommendations for re- tilation grill and the back ventilation exit grill.  storing the equipment to operation after an error  3. Versions B, C and D: Remove the front grill by  condition has occurred. pulling the grill firmly away from the amplifier. Preventative maintenance is recommended after  Version A: Use a 1/16-inch hex driver to  the first 250 hours of operation, and every three  remove the six screws from the front grill.  months or 250 hours thereafter. If the equipment ...

  • Page 51: Troubleshooting

    7224 OPERATOR’S MANUAL – SECTION 9 9 Troubleshooting 6. Look for any foreign objects lodged inside the  unit. 9.1 Introduction & Precautions 7. Inspect the entire lengths of wires and ribbon  cables for breaks or other physical damage. This section provides a set of procedures for  8. If there is any physical damage to the amplifier,  identifying and correcting problems with the 7224  please return it to AE Techron for repair. amplifier. Rather than providing an exhaustive and  detailed list of troubleshooting specifications, this  9.3 No Signal section aims to provide a set of shortcuts intended  Missing Output signal may be caused by one of  to get an inoperative amplifier back in service as  the following: quickly as possible. 1. Versions B, C and D: The Master/Follower DIP  The procedures outlined in this section are direct- switch (SW#6) is set to the Follower (Down)  ed toward an experienced electronic technician;  position. The amplifier should only be configured  it assumes that the technician has knowledge of ...

  • Page 52: Standby And Stop Leds Remain Illuminated

    7224 OPERATOR’S MANUAL – SECTION 9 button to return the amplifier to Run mode. If the  2. Faulty output connections and load. 3. Undesired DC offset at the Output and Input  amplifier does not reset, the amplifier’s internal  signal. transformers may need to be replaced. Please see  If the amplifier chronically overheats with suitable  the Factory Service information at the end of this section. power/load conditions, then the amplifier may not  be receiving adequate airflow. To check for ad- 9.6 Standby and Stop LEDs Remain equate airflow, proceed with the following steps: Illuminated 9.8.2 Check for Inadequate Airflow A Remote Standby switch will cause the amplifier  1. Check air filters. Over time they can become  to enter Standby mode.

  • Page 53: Factory Service

    7224 OPERATOR’S MANUAL – SECTION 9 3. Turn AC mains power back on. If the Fault LED  tom fees, duties, and/or taxes). Please review the  Warranty at the beginning of this manual for more  doesn’t illuminate again, turn the signal source  information. 4. If the Fault LED is still illuminated and the Fault  All service units must be given Return Authoriza- condition doesn’t clear, return the amplifier for  tion by AE Techron, Inc. before being returned.  Factory Service. See the Factory Service infor- Return Authorizations can be requested on our  website or by contacting our Customer Service  mation at the end of this section. Department. CAUTION Please take extra care when packaging your am- plifier for repair. It should be returned in its original  Shut off the signal source before reset- packaging or a suitable alternative. Replacement ...
  • Page 54 7224 OPERATOR’S MANUAL – SECTION 9 Information subject to change 96-8006348_05-31-2022...
  • Page 55 7224 OPERATOR’S MANUAL – SECTION A Appendix A: Voltage Spike Caused by the High-Voltage Supply mode, the user should either: A voltage spike (signal “pop”) will occur when the  7224 amplifier is Enabled (changed from Standby  1. Turn the input signal level down to 0V, or to Run status) or when the amplifier is powered on  2. Turn the amplifier’s front-panel gain control  by pressing the front breaker switch. See Figure knob all the way counter-clockwise (0%). A-1. This voltage spike is caused by the activation  If the amplifier needs to be in Standby mode for  of the amplifier’s high-voltage supply. safety reasons, it is recommended that the user leave sensitive loads disconnected until the ampli- To prevent this voltage spike from affecting the  fier has been turned on, or removed from Standby. load, instead of placing the amplifier in Standby  Figure A.1 – Voltage Spike Caused by the High-Voltage Supply Information subject to change...
  • Page 56 7224 OPERATOR’S MANUAL – SECTION A Information subject to change 96-8006348_05-31-2022...

  • Page 57: Configuration Settings Located On The Main Board

    7224 OPERATOR’S MANUAL – SECTION B Appendix B: Version A Amplifier Contains the following information: Advanced Configuration, Configuration Settings Located on the Main Board • Applications, Controlled Current Operation • Applications, Configuration and Wiring for Multiamp Operation (Push/Pull, Parallel, and Series) • 1 Advanced Configuration 1.2 Accessing the Main Board Through...

  • Page 58: Accessing The Main Board Through The Top Cover

    7224 OPERATOR’S MANUAL – SECTION B 1.3 Accessing the Main Board Through Procedure 1. Remove the amplifier’s front grill cover by  the Top Cover firmly pulling the grill cover away from the front  Complete the following instructions if your 7224  panel. The grill is held by magnets. amplifier does not contain an access panel built  2. Use the Phillips screwdriver to remove nine (9)  into the top cover.  screws: a.  Three (3) screws from each side DANGER b.  One (1) screw from the back c.  Two (2) screws from the front (after the grill  Uninsulated terminals with AC mains potential are exposed when the top cover is removed.
  • Page 59 7224 OPERATOR’S MANUAL – SECTION B 1.3.2 Fixed Gain/Variable Gain Setting The 7224 amplifier ships with an enabled Gain  Control knob (located on the amplifier front panel).  To disable the Variable Gain control and set for a Fixed Gain of 20, locate and unplug the red  connector from jumper J10. Then place a jumper on the left two pins at that location. See Figure B.1.3. Figure B.1.3 – Configuring Fixed/Variable Gain 1.3.3 Controlled-Voltage/ Controlled-Current Mode Setting To allow the amplifier’s output voltage to be con-...
  • Page 60 7224 OPERATOR’S MANUAL – SECTION B 1.3.5 Run Mode/Stop Mode on Power-Up Setting The amplifier will power-up to Run Mode when jumper J11 is in the Left position (default setting).  To cause the amplifier to enter Stop Mode on power-up, place jumper J11 in the Right position.  See Figure B.1.6. Figure B.1.6 – Configuring the Run Mode/Stop Mode  on Power-Up Setting 1.3.6 Standby on Overload Setting When this latch is enabled, the amplifier will move  into Standby mode when it senses an activation of the IOC (Input/Output Comparator) Distortion Alert ...
  • Page 61 7224 OPERATOR’S MANUAL – SECTION B 2 Applications 2.1 Controlled Current Operation The procedures outlined in this section assume  competence on the part of the reader in terms of  amplifier systems, electronic components, and  good electronic safety and working practices. 2.1.1 Controlled-Voltage vs. Controlled- Current Modes of Operation Figure B.2.1 – Input to Output Comparison,  AE Techron 7224 amplifiers can be field-configured  Controlled-Voltage Operation to operate as Voltage Amplifiers (Voltage-Con- trolled Voltage Source) or as Transconductance Amplifiers (Voltage-Controlled Current Source).  The mode selection is made via a jumper setting  located on the amplifier main board. See the “Ad- vanced Configuration” section in this Appendix  for more information. When configured as a Controlled-Voltage source (voltage amplifier), the amplifier will provide an  output voltage that is constant and proportional  to the control (input) voltage. If the load’s imped- Figure B.2.2 – Input to Output Comparison, ...
  • Page 62 7224 OPERATOR’S MANUAL – SECTION B 2.1.3 Controlling Compensation for When operating in Controlled Current (CC) mode,  CC Operation a compensation circuit is required to ensure ac- curate output current. Since the load is a critical  AE Techron 7224 amplifiers can be configured for  circuit component in CC mode, the inductive and  either Controlled Voltage (CV) or Controlled Cur- rent (CC) mode of operation. When operating the  resistive values of the load will determine the required compensation values. While the factory- amplifier in Controlled Voltage (CV) mode, com- default compensation setting will be sufficient  pensation is not required. However, when operat- for some applications, the compensation setting  ing in Controlled Current (CC) mode, the amplifier  may also be adjusted in the field. The following  load becomes an integral part of the system. In  section describes methods for determining and  order to ensure system stability and to control setting proper compensation when operating in ...
  • Page 63 7224 OPERATOR’S MANUAL – SECTION B STEP 3: Determine if Default or Custom Compensation is Required. If your load inductance is between 200 microHen- If your load inductance falls outside of the mid- range, or if your load resistance is greater than  ries and 1 milliHenry, and your load resistance 5 ohms, then you must calculate your required  is less than 5 ohms, then you can likely use the default compensation provided by the amplifier’s ...
  • Page 64 7224 OPERATOR’S MANUAL – SECTION B STEP 7: Optimizing the Compensation Values. Once an approximate Rc and Cc have been  If a change in compensation is necessary, an ad- computed, these values will need to be evaluated.  justment to the resistor component of the Compen- To do this, install components with the required  sation circuit is probably required.  values in the main board at locations R82 and C25 If the output current waveform is ringing, the circuit  as shown in Figure B.2.4. is underdamped: You have too much gain and  should lower the resistance (see Figure B.2.6). Figure B.2.6 – Square Wave Showing a  Decrease in R is Required If the output current waveform is rounded, the  Figure B.2.4 – Custom Compensation Location circuit is overdamped: You have too little gain and  should increase resistance (see Figure B.2.7). Remember the load you are connecting is a part of the system and the amplifier should not be turned on without the load being connected.
  • Page 65 Do not attempt to access the Main Board while the amplifier is running. Turn the 7224 DB25 Push/Pull Cable (part number 69- amplifier off and disconnect the AC Mains before opening the access panel. 8005951) IMPORTANT: Before removing the access Please contact AE Techron’s Sales Department...
  • Page 66 7224 OPERATOR’S MANUAL – SECTION B CAUTION After turning the amplifier off, let the unit sit for 3-5 minutes before removing the access panel. This will allow the electri- cal charge in the Power Supply capaci- tors to discharge. 6. On the Follower amplifier, locate the Access  Panel as shown in Figure B.2.9. Make sure Figure B.2.9 – Access Panel Screw Locations...
  • Page 67 7224 OPERATOR’S MANUAL – SECTION B 7. Using a digital voltmeter set to DC, measure  to verify an output from each amplifier of ap- across each amplifier’s back-panel output con- proximately 100 Vrms (gain of 20). See Figure nector terminals (OUTPUT to COM) to verify  B.2.13. NOTE: If either amplifier’s gain varies  that the DC offset of each amplifier is less than  significantly from the set gain of 20, the amplifi- 10 mVdc. See Figure B.2.12. NOTE: If either  er may require servicing. Contact AE Techron amplifier’s DC offset is greater than 10 mVdc,  Technical Support. the amplifier may require servicing. Contact AE Connect Load and Test System Output 1. Power down the amplifiers. Techron Technical Support. 8. On the Master amplifier only, press the Stop  2. Connect the two output cables leading from the  button to place the amplifier in Standby mode. Master and Follower amplifier’s OUTPUT con- 9. Verify that both Master and Follower amplifier  nectors to your load.
  • Page 68 7224 OPERATOR’S MANUAL – SECTION B Figure B.2.13 – Measuring Amplifier Gain Figure B.2.14 – Measuring System Gain B-12 Information subject to change 96-8006348_05-31-2022...
  • Page 69 Kit also contains the shunt required to defeat the  These Parallel multi-amp systems are configured  amplifier’s external level control.  with all amplifiers configured as Master amplifiers.  7224/7226/2105 Parallel Wiring Kit, 2 Amplifiers To avoid problems that might occur with signal  (part number 69-8002448)  latency, the input signal is sent through a parallel  7224/7226/2105 Parallel Wiring Kit, 3 Amplifiers input cable that delivers the signal simultaneously  (part number 69-8002470)  to all amplifiers in the system.  7224/7226/2105 Parallel Wiring Kit, 4 Amplifiers Accessories Required (part number 69-8002471) ...
  • Page 70 7224 OPERATOR’S MANUAL – SECTION B The kits also include the wire(s) needed for wiring  CAUTION the parallel inputs through the Removable Barrier  Block (WECO) connectors and the input termina- After turning the amplifier off, let the unit tors required during system setup. Parallel wiring  sit for 3-5 minutes before removing the kits are recommended for all Parallel configura- top cover. This will allow the electrical charge in the Power Supply capacitors tions. to discharge. Please contact AE Techron’s Sales Department 1.
  • Page 71 7224 OPERATOR’S MANUAL – SECTION B Figure B.2.17 – Mounting the Ballast Resistor 4. Slide a second washer over the threaded por- tion of each bolt (inside the amplifier case). Figure B.2.19 – Gain Control Connection  5. Apply thread-lock to the threads of each bolt. on the Main Board 6. Thread a nut onto each bolt and tighten down,  tion, the variable gain controls located on the  securing the bracket to the back panel. amplifier front panels must be disabled. Once dis- 7. Connect the resistor’s terminal lead to the  abled, each amplifier will have a fixed gain of 20. If  output connector labeled OUTPUT as shown in  preferred, the gain for each amplifier can be fixed  Figure B.2.18. Tighten the screw to secure. at a lower level. 8. DO NOT replace the top cover until you have  1. On the amplifier main board, locate the con- completed the additional preparation steps for  nector that connects the external gain control  this configuration. to the main board by following the wire leading  from the gain control (see Figure B.2.19).  2. Pull gently upward to remove the 3-pin con- nector from the main board. Secure the gain- control cable within the amplifier cabinet.
  • Page 72 7224 OPERATOR’S MANUAL – SECTION B 1. Connect for Balancing these resistors can be mounted to a header or soldered directly to the pins.   A. For each amplifier in your system, connect  a leg of the black output cable found in  Parallel System Balancing the Parallel Wiring Kit to one of the ampli- Before operating a paralleled amplifier system, the  fier’s output connectors labeled COM on  system first must be “balanced” to ensure system  the amplifier back panel. Important: Do  stability. The balancing process seeks to calibrate  not connect this cable to the LOAD and do  the amplifiers so they operate as similar as pos- not connect the red cable at this time. See sible. To prevent unwanted current and dissipation  Figure B.2.21.
  • Page 73 7224 OPERATOR’S MANUAL – SECTION B C. Ensure that the inputs of all of the ampli- C. Ensure that all amplifier inputs are termi- fiers are terminated by using a resistor- nated by using a resistor-terminated barrier  terminated barrier block connector (see  block connector (see Figure B.2.22) or  Figure Figure B.2.22) or similar device.  similar device. D. Power up all amplifiers in the system and  run the amplifiers for several minutes in  Ready state to allow DC offsets to stabi- lize. E. Using a digital voltmeter set to DC, mea- sure across the amplifier’s back-panel out- put connector terminals (OUTPUT to COM)  to verify that the DC offset of each amplifier  is less than 5 mVdc. See Figure B.2.21. Figure B.2.22 – Terminating the Amplifier Input F. If the DC offset for any amplifier is greater  than 5 mVdc, adjust each amplifier using  2. Verify Interlock Operation the Amp Offset (R65) on the amplifier main  A. Power up each amplifier by switching to  board. Adjust each amplifier’s DC offset to  ON the front-panel ON/OFF switch.
  • Page 74 7224 OPERATOR’S MANUAL – SECTION B D. You can use balanced wiring (shown),  or you can build the wire for unbalanced input. If using unbalanced wiring, switch  the INPUT SELECT switch located on the  SIM-BNC input card on each amplifier to  the LEFT position (unbalanced setting). E. Alternately, you can connect an unbal- anced input signal to the SIM-BNC’s BNC  input connector using the BNC wires and  T-connectors provided in the Parallel Wir- ing Kit as shown in Figure B.2.25. Set the INPUT SELECT switch located on the SIM- BNC input card on each amplifier to the  LEFT position (unbalanced setting).  F. Connect the input wire to a signal genera- tor and to each amplifier in your system.  Figure B.2.25 – BNC Connections for Parallel Inputs 5. Verify and Adjust Amplifier Gain A.
  • Page 75 7224 OPERATOR’S MANUAL – SECTION B Figure B.2.27 – Wiring and Test Points for Amp Gain Adjustment Figure B.2.28 – Wiring and Test Points for Gain Matching B-19 Information subject to change 96-8006348_05-31-2022...
  • Page 76 7224 OPERATOR’S MANUAL – SECTION B than 50 mV. (50 mV corresponds to 0.5A of  D. Starting with a signal input approximately  circulating current.) Check any additional  10% of the typical input required for your  amplifiers in your system. application, power up the amplifiers. D. Continue to monitor the DVM readings  E. Using a digital voltmeter set to AC volts,  while turning signal input level up to the  connect between the positive outputs of  level required for your application. the amplifiers (Amplifier #1 OUTPUT to  8. Verify Current Sharing Amplifier #2 OUTPUT). Verify a meter  A. Power down the amplifiers. reading of less than 200 mV, up to the typi- B.  Connect your load to the two output  cal power level for the application. (200 mV  cables. Connect the positive terminal of  corresponds to 2A of circulating current.)  Check additional amplifiers in your system. your load to the red cable connected to the amplifier ballast resistors. Connect the  F. Continue to monitor the DVM readings ...
  • Page 77 7224 OPERATOR’S MANUAL – SECTION B Figure B.2.30 – Wiring and Test Points to Verify Current Sharing B-21 Information subject to change 96-8006348_05-31-2022...
  • Page 78 7224 OPERATOR’S MANUAL – SECTION B Figure B.2.31 – System Setup for Two-, Three-, or Four-Amplifier Parallel Systems B-22 Information subject to change 96-8006348_05-31-2022...
  • Page 79 7224 OPERATOR’S MANUAL – SECTION B 2.1.3 Configuration and Wiring for Se- labels on each amplifier’s back panel to clarify the  ries Operation amplifier designation during setup and operation  (Master, Follower #1, Follower #2). Series multiamp configurations for 7224 ampli- fiers require a SIM-BNC-OPTOC card be used  Consider placing a “Master” or “Follower” label on  in place of the standard SIM-BNC input card that  the front panel of each SIM-BNC-OPTOC card,  comes factory-installed in the amplifier. The SIM- as well, to clarify the designation during setup and  BNC-OPTOC card can be ordered as a multi-amp  operation. accessory from AE Techron. You will need one Configure SIM-BNC-OPTOC Input Cards SIM-BNC-OPTOC card for each 7224 amplifier in  for Follower Operation your Series amplifier system. The SIM-BNC-OPTOC card that will be used in  The SIM-BNC-OPTOC is a specialized input card ...
  • Page 80 7224 OPERATOR’S MANUAL – SECTION B Install SIM-BNC-OPTOC Input Cards in leg (–) on both input connectors. This allows the  Amplifiers removable barrier block to be used as a balanced input and the BNC connector to be used as an  After configuring the SIM-BNC-OPTOC card,  unbalanced floating input.  install one card in each amplifier to be used in  your Series system. Before installing a card in an  To configure both input connectors with the nega- amplifier, make sure the amplifier is turned off for  tive leg tied to ground through a 2.7-ohm resistor,  at least 3-5 minutes and the AC mains are discon- place a shunt across the pins at jumper J4 on the  nected. input card to be installed in the Master amplifier  of the system. This allows either the BNC or the  WARNING removable barrier block connector to be used as an unbalanced grounded input.
  • Page 81 7224 OPERATOR’S MANUAL – SECTION B 4. Remove the card from the amplifier card bay. 5. For each amplifier, plug the ribbon cable into  the ribbon connector on the SIM-BNC-OPTOC  card. Install the new card into the card bay on the amplifier back panel and secure in place  using the retained screws. 6. (optional) We recommend labeling each SIM- BNC-OPTOC card as “Master” or “Follower” to  Figure B.2.36 – Access Panel Screw Locations identify the configuration of the installed input  card. Make sure that all 8 screws are accessible. Configure Amplifiers’ Main Boards for Remove the unit from its rack, if necessary.
  • Page 82 7224 OPERATOR’S MANUAL – SECTION B nals labeled COM and CHASSIS GROUND on  D. Terminate the input of the Master amplifier  the output connector. See Figure B.2.38. using a resistor-terminated barrier block  connector (see Figure B.2.39) or similar  2. Retain the resistor for later use. device. Figure B.2.38 – Output Terminal Resistor Location Amplifier Connections Figure B.2.39 – Terminating the Amplifier Input Complete the following procedures to connect your  E. Power up each amplifier by switching to  amplifiers for Series operation. ON the front-panel ON/OFF switch. Allow  1. Connect and Test Amplifier Interlock and the amplifiers to come to the Ready state.  DC Offset When Ready, the amplifier Ready and Run  A. Using a DB-9M high-voltage interlock ca- LEDs will be lit. Note: Some amplifiers that ...
  • Page 83 7224 OPERATOR’S MANUAL – SECTION B Figure B.45 – Terminating the Amplifier Input Figure B.2.40 – Wiring and Test Points for DC Offset B.  Apply a sine wave of 5Vrms at 100 Hz at  last Follower amplifier’s OUTPUT connec- the Master amplifier input. Using a voltme- tor to your load. ter measure across each amplifier’s back- C. Power up all amplifiers and allow them to  panel output connector terminals (OUT- come to the Ready state. PUT to COM) to verify an output from each  D. Apply a sine wave of 5Vrms at 100 Hz at  amplifier of approximately 100Vrms (gain  the Master amplifier input. Using a volt- of 20). See Figure B.2.41. NOTE: If any  meter, measure across the system load to amplifier’s gain varies significantly from the  verify an output from the system of approx- set gain of 20, the amplifier may require  imately 200Vrms. See Figure B.2.42.
  • Page 84 7224 OPERATOR’S MANUAL – SECTION B Figure B.2.41 – Wiring and Test Points for Amp Gain Figure B.2.42 – Wiring and Test Points for System Gain B-28 Information subject to change 96-8006348_05-31-2022...
  • Page 85 7224 OPERATOR’S MANUAL – SECTION B Figure B.2.43 – System Setup for Two- or Three-Amplifier Series Systems 2.1.4 Multiamp System Start-up Procedure and Multiamp System Opera- tion Please refer to Sections 7.45 and 7.46 in the main  manual for Multiamp System start-up and opera- tion. B-29 Information subject to change 96-8006348_05-31-2022...
  • Page 86 Appendix C: 7224 SIM - Interlock I/O Connector Pinouts and Functions Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted Amplifier  Used for driving  Can be great- Used for monitoring amplifier output  Voltage Monitoring: Connect a voltage meter to mon- AC or Output Follower amplifiers;  er than ±200V  voltage; driving Follower amplifiers  itor the output voltage being produced by the amplifier.  monitoring amplifier  peak in multi-amp Push/Pull and Parallel ...
  • Page 87 Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted Blanking Input Blanking control  0Vdc 5-6 Vdc The blanking circuit shuts down the  Blanking (Customer Mute): Build a switchable circuit  (Customer Mute) amplifier output stage in less than  using an external, isolated 5V power supply that can  10 µs. apply a +5V signal to PIN 8. Connect across PIN 8  (Blanking) and PIN 18 (Blanking Return). Temperature  Temperature Mon- (VDC * 100) –  3.5 - 5Vdc  This circuit has a 1K build-out resis- Temperature Monitoring: Connect a voltage meter to  273 = degrees  output is  monitor the temperature at the heatsinks.  Monitor itor tor.
  • Page 88 I MON –  Differential Current  5A/V  Inverted I MON+ (PIN 6). Output  Current Monitoring: Connect a voltage meter to  AC or (alt.: OEM  Monitor – ; current produced per voltage  monitor the output current being produced by the  App) (- Input Monitor,  amplifier. For each 1V detected, current output is 5A  detect. OEM only) (7212/7224/7226) or 20A (7548/7794/7796/7796HC). I SUM1– Multiple Amplifier  Planned for use in multiple amplifier  Currently not used. Summing, Ampli- configurations - paralleled and run- fier 1 ning Controlled Current Mode I SUM2– Multiple Amplifier  Planned for use in multiple amplifier  Currently not used. Summing, Ampli- configurations - paralleled and run- fier 2 ning Controlled Current Mode...

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