Aetechron 7220 Series Operator's Manual
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Aetechron 7220 Series Operator's Manual

Single-channel industrial amplifiers
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7224
Operator's Manual
Single-Channel Industrial Amplifiers 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 Amplifiers for Demanding, High-Power Systems 574.295.9495 | www.AETechron.com 2507 Warren Street, Elkhart, IN 46516...
  • 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.c pack or equivalent which, if needed, may be obtained...
  • Page 4 For Compliance Questions Only: Larry Shank 2507 Warren Street 574-295-9495 Elkhart, IN 46516 lshank@aetechron.com 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 –...

  • Page 5: Table Of Contents

    Contents 1 Introduction ............................7 1.1 Features ..........................7 2  Amplifier Unpacking and Installation ....................8 2.1 Safety First ..........................8 2.2  Unpacking ..........................8 2.3 Installation ..........................8 3 Connections and Startup .......................9 3.1  Other Operation Modes and Configurations................9 3.2  Connecting the Load ......................9 3.3  Connecting the Input Signal ....................10 3.4  Connecting the AC Supply ....................3.5 Start-up Procedure ......................4 ...
  • Page 6 List of Figures Figure 1.1 – 7224 Front Panel ......................7 Figure 3.1 – 7224 Back Panel ......................9 Figure 3.2 – Closeup of the Output Terminal Resistor ...............10 Figure 3.3 – Connecting the Load .....................10 Figure 3.4 – Closeup of SIM card ......................10 Figure 3.5 – Wiring for Unbalanced or Balanced Input Connector ............11 Figure 3.6 – Closeup of AC Mains Outlet ..................11 Figure 3.7 – Sample of Configurations Setting Label ................11 Figure 4.1 – Power Switch.........................13 Figure 4.2 – Gain Control ........................13 Figure 4.3 – Push Buttons .........................14 Figure 4.4 – Indicators ........................14 Figure 4.5 – Main Status Indicators ....................14 Figure 4.6 – Fault Status Indicators....................15 Figure 4.7 – Back Panel Controls and Connectors ................16 Figure 5.1 – Access Panel Screw Locations ..................17 Figure 5.2 – Main Board Location Inside Access Panel ..............18 Figure 5.3 – Master/Follower Setting....................18 Figure 5.4 – Gain Trim Control ......................18 Figure 5.5 – Controlled-Voltage/Controlled-Current Mode Setting ............19 Figure 5.6 – Compensation Setting ....................19 Figure 5.7 – Run Mode/Stop Mode on Power-Up Setting ..............20 Figure 5.8 – Standby Mode on Over Load Setting ................20...

  • Page 7: Introduction

    7224 OPERATOR’S MANUAL – SECTION 1 Figure 1.1 – 7224 Front Panel 1 Introduction 1.1 Features Congratulations on your purchase of the 7224 AE  Techron power amplifier—one of the most precise  The 7224 is a single-channel linear amplifier de- power amplifiers ever produced for industrial ap- signed for use in demanding applications requir- plications and testing. The 7224 amplifier is built  ing low noise, low distortion, and accurate power  and tested to the most stringent quality standards  amplification from DC to 300 kHz. It features: for long life and outstanding performance. The AE  • Small-signal bandwidth of DC to 600 kHz. Techron brand is known throughout the world for  • Continuous output of over 900 watts RMS at 4 its robust precision amplifiers as well as its product  ohms. service and support. • 40 mSec pulses of up to 52 amperes peak into The 7224 is a 4-quadrant, 900VA, DC-enabled ...

  • Page 8: Amplifier Unpacking And Installation

    7224 OPERATOR’S MANUAL – SECTION 2 2 Amplifier Unpacking and Along with any additional accessories purchased  by the customer, all 7224 amplifiers ship with the  Installation following: The 7224 amplifier is a precision instrument that  • 7224 Amplifier can be dangerous if not handled properly. Lethal  • Accessories Kit (contains three 2.7-ohm resis- voltages are present in both the AC input supply  tors, and four rubber feet) and the output of these amplifiers. For this reason,  • Power Cord safety should be your primary concern when you • 7224 Quick Start sheet and electronic copy of setup and operate this amplifier.

  • Page 9: Connections And Startup

    7224 OPERATOR’S MANUAL – SECTION 3 Figure 3.1 – 7224 Back Panel 3 Connections and Startup This section details the wiring and startup pro- first be wired and tested individually in Controlled- cedures for a single 7224  amplifier operating in  Voltage mode to ensure proper operation.  Controlled-Voltage mode (factory default). Before  To configure two or more amplifiers for Series or connecting the amplifier, make sure the AC power  Parallel operation in Controlled-Voltage mode, refer cord is unplugged.  to the topic Multi-Amplifier Systems in the “Ap- WARNING plications” section of this manual. For Series operation in Controlled-Current ELECTRIC SHOCK HAZARD.

  • Page 10: Connecting The Input Signal

    7224 OPERATOR’S MANUAL – SECTION 3 Figure 3.2 – Closeup of the Output Terminal Resistor NOTE: The 7224 amplifier comes with a factory- Figure 3.3 – Connecting the Load installed 2.7-ohm, 2W, 5%, metal-oxide resis- tor connecting the terminals marked “COM and  “SIM (Specialized Input Module) Card” located on  “CHASSIS GROUND” (see Figure 3.2). This  the amplifier back panel (see Figure 3.4). The SIM  resistor should NOT be removed except when the  card offers the choice of BNC or “WECO” terminal  amplifier is being used as a Follower amplifier in a  Series multi-amp system. WARNING: Removing block input connectors. this resistor can cause dangerous output and/ The Input Select switch, located on the SIM mod- or damage to the load. ule between the input connectors, allows conve- 3.2.2 Connecting the Outputs nient selection of balanced or unbalanced input...

  • Page 11: Connecting The Ac Supply

    7224 OPERATOR’S MANUAL – SECTION 3 IMPORTANT: The Input Select switch can also function as a Ground Lift switch for the BNC Input connector. If circulating currents/ground loops/60-Hz Hum occur when using the BNC Input, move the Input Select switch to the right to lift the ground on the connector. We recommend that you use cables that are high ...

  • Page 12: Amplifier Operation

    7224 OPERATOR’S MANUAL – SECTION 4 4 Amplifier Operation 4.1.3 Push Buttons The 7224 provides three front-panel soft-touch 4.1 Front-Panel Controls push buttons that control two basic operating  This section provides an overview of Front-Panel conditions: (1) Run condition (the high-voltage  controls and indicators found on the 7224 ampli- transformers are energized and the unit will am- fier.  plify the input signal); and (2) Standby condition 4.1.1 Power Switch (the low-voltage transformer is energized but the ...

  • Page 13: Figure 4.3 - Push Buttons

    7224 OPERATOR’S MANUAL – SECTION 4 Enable, Stop and Reset Buttons The following details the results when each of the  three Push Buttons are pressed on the amplifier  front panel. See Figure 4.3 for Push Button loca- tions. Enable – When the amplifier is in Standby/Stop  mode, pressing the Enable button will release the  Figure 4.3 – Push Buttons amplifier from Standby and place the amplifier in  Run mode. Pressing the Enable button will also re- lease the amplifier from some Standby conditions.  Stop – Pressing the Stop button will place the  amplifier in Standby/Stop mode (both Standby and  Stop LEDs will be lit). Reset – When the amplifier has been placed  Figure 4.4 – Indicators in Standby/Fault mode due to a fault condition,  pressing the Reset button will return the amplifier  fier has been configured for startup in Stop mode,  to Run mode if the condition causing the fault con- pressing the Reset button will place the amplifier ...
  • Page 14 7224 OPERATOR’S MANUAL – SECTION 4 Front-Panel Indicators Figure 4.5 details the operational modes indicated 4.1.4 Main Status Indicators by the Main Status indicators. Four Main Status indicators are located on the am- NOTE: See the “Applications” section for main plifier’s front-panel (see Figure 4.4). These LEDs  status indicator interpretation when operating a  monitor the internal conditions of the amplifier and  multi-amp system.

  • Page 15: Back-Panel Controls And Connectors

    7224 OPERATOR’S MANUAL – SECTION 4 4.1.5 Fault Status Indicators from the load to this 3-position terminal strip with #8 screws. It accepts up to #10 AWG wire.  Four Fault Status indicators are located on the amplifier front panel (see Figure 4.4). These LEDs  BNC Input Connector – This input option pro- monitor the internal conditions of the amplifier  vides a standard unbalanced input. and will illuminate when a fault condition occurs.

  • Page 16: Advanced Configuration

    7224 OPERATOR’S MANUAL – SECTION 5 5 Advanced Configuration 5.1 Removing Amplifier Top Cover The 7224 amplifier was designed to offer excep- Most internal configuration settings can be made  tional versatility in operation. You can choose from a  by removing the amplifier’s top cover.  range of field-configurable options, including: IMPORTANT: Before removing the top cover, • Operate as a stand-alone amplifier or as part of make sure the amplifier is turned off for at a multiple-amplifier system.
  • Page 17 7224 OPERATOR’S MANUAL – SECTION 5 5.2.1 Master/Follower Setting To enable the amplifier for use as a single amplifier  or as the Master amplifier in a multi-amplifier  system, set jumpers P1 and P2 in the Master posi- tion (jumpers across top two pins of each set). The  Master setting is the factory default. To enable the  amplifier for use as a Follower amplifier in a multi- amplifier system, set jumpers P1 and P2 in the Fol- lower position (jumpers across bottom two pins of  each set). See Figure 5.1. Figure 5.1 – Master/Follower Setting For complete information on multi-amp system see the “Applications” section of this manual. 5.2.2 Fixed Gain/Variable Gain Setting The 7224 amplifier ships with an enabled Gain ...
  • Page 18 7224 OPERATOR’S MANUAL – SECTION 5 CAUTION In Controlled-Current Mode, the load is part of the ampli- 3. Never leave the load open. If you feel the load fier circuit, and the relationship of the load to the amplifier  must be fused, which could lead to a potential open is critical. For proper and safe operation in Controlled- circuit, please contact AE Techron Application Engi- Current mode, you must obverve the following guidelines: neering department. ...

  • Page 19: Configuration Settings Located On The Power Supply Board

    7224 OPERATOR’S MANUAL – SECTION 5 power-up, place jumper J11 in the Right position. See Figure 5.5. 5.2.6 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  circuit. The IOC Distortion Alert circuit continuously  compares the input waveform to the output wave- form. When a distortion of more than 0.5% occurs,  the IOC circuit will activate. The amplifier will re- main in Standby Mode until the Reset switch on the front panel is pushed or a Reset signal is received ...
  • Page 20 7224 OPERATOR’S MANUAL – SECTION 5 Figure 5.9 – J3 and J7 Plug Locations for  Figure 5.10 – J4 and J8 Plug Locations for  High-Current Output High-Voltage Output 5.9).                      3. For High Voltage (180V) Output (see Figure 5.10). 5.3.3 Changing Bi-Level Power Supply Function The amplifier provides three Bi-Level switch set- tings:  Automatic, High, or Low. The user can  select between settings via a switch on the Power  Figure 5.11 – Bi-Level Power Switch Location Supply board. 5.3.4 Selecting the Best Voltage Poten- To access and change the Bi-Level Power switch,  tial and Bi-Level Power Switch Settings for Your Application follow these steps: The output of the amplifier will be determined by ...

  • Page 21: Applications

    7224 OPERATOR’S MANUAL – SECTION 6 6 Applications AE Techron 7224 amplifiers come with a SIM-BNC  6.1 Remote Status and Control using input module that also contains a female, 25-pin the SIM Interlock I/O Connector D-Sub connector. This connector can be used  The procedures outlined in this section assume to provide remote control and monitoring of the  competence on the part of the reader in terms of amplifier. ...

  • Page 22: Figure 6.3 - Remote Status And Reset Schematic

    7224 OPERATOR’S MANUAL – SECTION 6 6.1.2 Remote Amplifier Status and Reset Use a male, 25-pin D-Sub connector and high- The SIM Interlock I/O Connector can be used to  quality wire to build the circuit. Figure 6.3 sche- create a circuit to monitor remotely one or more matic details the circuit and components required  amplifier conditions, including Run status, Over- for all status and reset functions. temperature, Overload and Overvoltage. The cir- cuit can also be constructed to allow remote reset of the amplifier when it is forced to Standby due to ...
  • Page 23 7224 OPERATOR’S MANUAL – SECTION 6 Remote Signal of Run Condition Remote Signal of OverVoltage 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 Level when Deasserted: 0V Remote Signal of OverLoad Condition Note: When amp is normal, this pin is pulled to...

  • Page 24: Figure 6.5 - Remote Current Monitoring

    7224 OPERATOR’S MANUAL – SECTION 6 chaining Interlock (PIN 4) across amps. Level when Deasserted: 10 to 15 V 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  Run condition. at startup. The Remote Enable/Standby circuit will  Signal Type: DC not function if the Startup to Standby Latch has  Level when Asserted: 0 to 8 V been activated on the amplifier. 6.1.4 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 ...

  • Page 25: Controlled Current Operation

    7224 OPERATOR’S MANUAL – SECTION 6 6.2 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. 6.2.1 Controlled-Voltage vs. Controlled- Current Modes of Operation AE Techron 7224 amplifiers can be field-config- ured to operate as Voltage Amplifiers (Voltage- Figure 6.7 – Input to Output Comparison, ...

  • Page 26: Figure 6.9 - Factory-Installed Default Rc Network

    7224 OPERATOR’S MANUAL – SECTION 6 default compensation setting will be sufficient  rent (CC) mode of operation. When operating the  for some applications, the compensation setting  amplifier in Controlled Voltage (CV) mode, com- may also be adjusted in the field. The following  pensation is not required. However, when operat- section describes methods for determining and  ing in Controlled Current (CC) mode, the amplifier  setting proper compensation when operating in  load becomes an integral part of the system. In  Controlled-Current mode. order to ensure system stability and to control available bandwidth, compensation via an RC 6.2.3 Controlling Compensation for network is required for CC operation. The following  CC Operation steps will allow you to compensate your amplifier  AE Techron 7224 amplifiers can be configured for  for operation in CC mode safely and effectively. either Controlled Voltage (CV) or Controlled Cur- STEP 1: Check Amplifier Operation in CV mode. We recommend that you power-up and enable the ables the factory-installed RC network (see Figure amplifier in Controlled Voltage mode without at-...
  • Page 27 7224 OPERATOR’S MANUAL – SECTION 6 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- ries and 1 milliHenry, and your load resistance  range, or if your load resistance is greater than  is less than 5 ohms, then you can likely use the 5 ohms, then you must calculate your required  default compensation provided by the amplifier’s  compensation. If, after calculating your required  factory-installed RC network. To select the factory- compensation, you determine that the default com- default compensation, please see STEP 4 below.

  • Page 28: Figure 6.10 - Custom Compensation Location

    7224 OPERATOR’S MANUAL – SECTION 6 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 6.10. is underdamped: You have too much gain and ...

  • Page 29: Multi-Amplifier Systems

    7224 OPERATOR’S MANUAL – SECTION 6 After final adjustments have been made to the  circuit because this can decrease stability and circuit, the final waveform for your planned appli- may increase inductance. cation should be tested to confirm the amplifier’s  • The parallel capacitor in the RC network serves compensation setting. to increase stability but can be removed, if it is not required for system stability. If the parallel  NOTE: capacitor is used, it will usually decrease the •...
  • Page 30 7224 OPERATOR’S MANUAL – SECTION 6 6.3.2 Accessory Recommendations by one ballast resistor with connection terminals and System Type mounting hardware. The 7224 Ballast Resistor  Push/Pull Systems Kit also contains the shunt required to defeat the  amplifier’s external level control.  7224 Two in Push/Pull Configuration: 7224 Parallel Wiring Kit (2-amp) (part number  (1) DB25 Push/Pull cable 69-8002448)  Parallel Systems 7224 Parallel Wiring Kit (3-amp) (part number  7224 Two in Parallel: 69-8002470) ...
  • Page 31 7224 OPERATOR’S MANUAL – SECTION 6 Use Only 7224 Amplifiers Operate with Safety in Mind Use only AE Techron 7224 amplifers to construct  Potentially lethal voltages and currents are pres- a 7224 multiamp system. Do not combine different  ent within the 7224 amplifiers. While the amplifiers’  models of AE Techron amplifiers in the same sys- chassis are earth-grounded, all internal grounds tem or use amplifiers made by another manufac- are floating. Particularly in series systems, all in- turer in a 7224 multiamp system. Such improper ternal grounds of Follower amplifiers could carry connections could damage the amplifiers. ...
  • Page 32 7224 OPERATOR’S MANUAL – SECTION 6 5. To replace the top cover, slide the cover in to WARNING place on the amplifier and replace the nine  screws. Do not attempt to access the Main Board 6. Position the grill near the front panel and snap  while the amplifier is running. Turn the amplifier off and disconnect the AC into place. Mains before opening the access panel.
  • Page 33 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.17 – Measuring DC Offset Figure 6.18 – Measuring Amplifier Gain Information subject to change 96-8005975 6-27-2021...
  • Page 34 7224 OPERATOR’S MANUAL – SECTION 6 2. Enable the amplifiers (place in Run mode), and  custom-configured may require that you press  then apply a sine wave of 5 Vrms at 100 Hz at  the Enable button to bring the amplifier to the  the Master amplifier input. Using a voltmeter,  Ready state.) Let the amplifiers run for several  measure across each amplifier’s back-panel  minutes in Ready state to allow DC offsets to  output connector terminals (OUTPUT to COM)  stabilize. to verify an output from each amplifier of ap- 5. Using a digital voltmeter set to DC, measure  proximately 100 Vrms (gain of 20). See Figure across each amplifier’s back-panel output con- 6.18. NOTE: If either amplifier’s gain varies  nector terminals (OUTPUT to COM) to verify  significantly from the set gain of 20, the amplifi- that the DC offset of each amplifier is less than  er may require servicing. Contact AE Techron 10 mVdc. See Figure 6.17. NOTE: If either  Technical Support. amplifier’s DC offset is greater than 10 mVdc,  Connect Load and Test System Output the amplifier may require servicing. Contact AE 1.
  • Page 35 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.20 – 7224 Push/Pull Configuration 5. Check the completed system diagram in Fig- DANGER ure 6.20 to verify proper system setup. 6. Turn input signal up to the level required for  Uninsulated terminals with AC mains potential are exposed when the top your application. cover is removed. Do not proceed until 6.3.5 Configuration and Wiring for Paral- AC Mains has been disconnected.
  • Page 36 7224 OPERATOR’S MANUAL – SECTION 6 Procedure 1. Remove the amplifier’s front grill cover by  firmly pulling the grill cover away from the front  panel. The grill is held by magnets. 2. 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  Figure 6.21 – Mounting the Ballast Resistor cover is removed. 3. Lift the cover straight up to remove it and set it  aside. 4. To replace the top cover, slide the cover in to place on the amplifier and replace the nine  screws. 5. Position the grill near the front panel and snap  into place. Figure 6.22 – Connecting the Ballast Resistor Mount and Connect Ballast Resistors Complete the following steps for each amplifier in ...
  • Page 37 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.24 – Gain Control Pin Settings fier’s output connectors labeled COM on  3. To set a fixed gain of 20, place a shunt (sup- plied) across pins 1 and 2 as shown in Figure the amplifier back panel. Important: Do  not connect this cable to the LOAD and do  6.24. not connect the red cable at this time. See 4. If preferred, a fixed gain can be set at another  Figure 6.25. level; place two resistors (not supplied) across  B. Starting with either end of the DB-25 Paral- pins 1 and 2 (resistor 1) and pins 2 and 3  lel Interlock cable found in the Parallel (resistor 2) as shown in Figure 6.24. Note:  Wiring Kit, connect the DB-25 connector to  these resistors can be mounted to a header or the INTERLOCK – I/O CONNECTOR on ...
  • Page 38 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.25 – Wiring and Test Points for Interlock Verification and DC Offset Adjustment C. On the first amplifier only, press the Stop  C. Ensure that all amplifier inputs are termi- button to place the amplifier in Standby  nated by using a resistor-terminated bar- mode. rier block connector (see Figure 6.26) or  D.  Verify that all amplifiers in the system enter  similar device. Standby mode (Standby LED is lit). D.  Power up all amplifiers in the system and  3. Adjust DC Offset run the amplifiers for several minutes in  A. Power down all amplifiers.  Ready state to allow DC offsets to stabi- B. On each amplifier main board, locate the  lize.  Amp Offset (R65) (see Figure 6.27). Figure 6.26 – Terminating the Amplifier Input Figure 6.27 – Amp Offset Location on the Main Board Information subject to change 96-8005975 6-27-2021...
  • Page 39 7224 OPERATOR’S MANUAL – SECTION 6 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 6.25. F. If the DC offset for any amplifier is greater  than 5 mVdc, adjust each amplifier using  the Amp Offset (R65) on the amplifier main  board. Adjust each amplifier’s DC offset to  read as closely as possible to zero. 4. Wire and Connect Parallel Inputs A. Power down the amplifiers.  Figure 6.28 – Barrier Block Connections for Parallel  B. Remove all amplifier input terminations. Inputs C. Use the jump wires included in the Paral- lel Wiring Kit and the Removable Bar- rier Block connectors that ship with each amplifier to create a paralleled input signal ...
  • Page 40 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.31 – Wiring and Test Points for Amp Gain Adjustment D.  Apply a sine wave to the amplifier input of  lesser than 100 Vrms, adjust Amp Gain  approximately 5Vrms (100-500 Hz). This  Trim (R210) to correct. should result in about 100Vrms output from F. Power up and repeat this procedure for the the amplifier (assuming a fixed gain of 20). second amplifier and all other amplifiers in  E. If voltmeter indicates an output greater or  your system. Information subject to change 96-8005975 6-27-2021...
  • Page 41 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.32 – Wiring and Test Points for Gain Matching 6. Amplifier Gain Matching A. Connect a digital voltmeter set to AC volts  C. Repeat the process of checking gain be- between the positive outputs of the first  tween the first amplifier and any additional  and the second amplifier (see Figure amplifiers in your system. 6.32). D.  Continue checking and adjusting until  B. Adjust Amp Gain Trim (R210) on the  the gain of all amplifiers in the system is  second amplifier for minimum AC voltage  matching to within millivolts.  (millivolts). Information subject to change 96-8005975 6-27-2021...
  • Page 42 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.33 – Wiring and Test Points for Circulating Currents 7. Verify Minimal Circulating Currents A. Power down the amplifiers.  the first and second amplifier (OUTPUT  B. On each amplifier, connect one ring  to OUTPUT). Starting with an input level  terminal end of your RED output cable to  of 0.5 Vrms, verify a meter reading of less  the ballast resistor on each amplifier back  than 50 mV. (50 mV corresponds to 0.5A of  panel. See Figure 6.33. Note: Do not con- circulating current.) Check any additional  nect the LOAD at this time. amplifiers in your system. C. Using a digital voltmeter set to AC volts,  D.  Continue to monitor the DVM readings  connect between the positive outputs of while turning signal input level up to the  level required for your application. Information subject to change 96-8005975 6-27-2021...
  • Page 43 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.34 – Wiring and Test Points to Verify Current Sharing 8. Verify Current Sharing A. Power down the amplifiers. E. Using a digital voltmeter set to AC volts,  B. Connect your load to the two output connect between the positive outputs of cables. Connect the positive terminal of the amplifiers (Amplifier #1 OUTPUT to  your load to the red cable connected to Amplifier #2 OUTPUT). Verify a meter ...
  • Page 44 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.35 – System Setup for Two-, Three-, or Four-Amplifier Parallel Systems Information subject to change 96-8005975 6-27-2021...
  • Page 45 7224 OPERATOR’S MANUAL – SECTION 6 6.3.6 Configuration and Wiring for Se- ries Operation Series multi-amp configurations for 7224 ampli- fiers require a SIM-BNC-OPTOC card be used  in place of the standard SIM-BNC input card that comes factory-installed in the amplifier. The SIM- BNC-OPTOC card can be ordered as a multi-amp accessory from AE Techron. You will need one  SIM-BNC-OPTOC card for each 7224 amplifier in  your Series amplifier system. Figure 6.36 – SIM-BNC-OPTOC Master/Follower  The SIM-BNC-OPTOC is a specialized input card  Jumpers Location that functions to synchronize the operation of all  amps in the system and provides for optical isola- OPTIONAL: Configure SIM-BNC-OPTOC tion. The input card allows you to designate (via ...
  • Page 46 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.39 – Ribbon Cable Connector Location on  SIM-BNC-OPTOC Figure 6.38 – Wiring Diagram for SIM-BNC-OPTOC  Input Connectors 5. For each amplifier, plug the ribbon cable into  the ribbon connector on the SIM-BNC-OPTOC Install SIM-BNC-OPTOC Input Cards in Amplifiers card. Install the new card into the card bay on the amplifier back panel and secure in place  After configuring the SIM-BNC-OPTOC card,  using the retained screws. install one card in each amplifier to be used in  6. (optional) We recommend labeling each SIM- your Series system. Before installing a card in an  BNC-OPTOC card as “Master” or “Follower” to  amplifier, make sure the amplifier is turned off for  identify the configuration of the installed input ...
  • Page 47 7224 OPERATOR’S MANUAL – SECTION 6 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. Tool Required #2 Phillips screwdriver Procedure 1.
  • Page 48 7224 OPERATOR’S MANUAL – SECTION 6 labeled COM. On the last Follower ampli- fier, connect the output wiring to the back- panel output connector labeled OUTPUT.  IMPORTANT: DO NOT connect the load at this time. D.  Terminate the input of the Master amplifier  using a resistor-terminated barrier block  connector (see Figure 6.42) or similar  Figure 6.42 – Terminating the Amplifier Input device. E. Power up each amplifier by switching to  output connector terminals (OUTPUT to  ON the front-panel ON/OFF switch. Allow  COM) to verify that the DC offset of each  the amplifiers to come to the Ready state.  amplifier is less than 10 mVdc. See Figure When Ready, the amplifier Ready and Run  6.43. NOTE: If any amplifier’s DC offset is  LEDs will be lit. Note: Some amplifiers that  greater than 10 mVdc, the amplifier may  have been custom-configured may require  require servicing. Contact AE Techron that you press the Enable button to bring ...
  • Page 49 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.44 – Wiring and Test Points for Amp Gain amplifiers enter Standby mode (Standby  servicing. Contact AE Techron Technical  LED is lit). Support. 2. Test Amplifier Gain 3. Test System Gain A. With the amplifiers in Standby mode,  A. Power down the amplifiers. remove the input signal termination and  B. Connect the two output wires leading from  connect a signal generator to the BNC  the Master amplifier’s COM connector and  or removable barrier block connector on last Follower amplifier’s OUTPUT connec- the SIM-BNC-OPTOC card of the Master tor to your load. amplifier ONLY.
  • Page 50 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.45 – Wiring and Test Points for System Gain 6.3.7 Multiamp System Operation Enable, Stop and Reset Buttons The following details the results when each of the  In multiamp systems, the Master amplifier controls  three Push Buttons are pressed on an amplifier  several operating functions for all amplifiers includ- front panel in a multi-amp system. ed in the system, so Follower amplifiers are said  to be “interlocked” with the Master amplifier. The  Enable – In multi-amp systems that have been functions controlled by the Master amplifer include configured to start up in Run mode (factory de- input signal, operating status, mode of operation ...
  • Page 51 7224 OPERATOR’S MANUAL – SECTION 6 Figure 6.46 – System Setup for Two- or Three-Amplifier Series Systems In multi-amp systems that have been configured to  the Enable button is pressed on each amplifier,  start up in Stop mode, when an amplifier is pow- that amplifier will be placed in Remote Standby  ered on, the amplifier will be placed in Standby/ mode (Ready and Standby LEDs lit) and remain  Stop mode (Stop and Standby LEDs lit). When  in Remote Standby mode until all amplifiers in the  Information subject to change 96-8005975 6-27-2021...
  • Page 52 7224 OPERATOR’S MANUAL – SECTION 6 system have been Enabled. The system will auto- If the amplifier reporting the fault condition has  matically proceed to Run mode when all amplifiers  been configured for startup in Stop mode, pressing  in the system achieve Remote Standby mode. the Reset button will place the amplifier in Stand- by/Stop mode. Press the Enable button to return  Stop – Pressing the Stop button on any amplifier  the amplifier system to Run mode. in the system will place that amplifier in Standby/ Main Status Indicators for Multi-amplifier Stop mode and place all other amplifiers in the  Systems system in Remote Standby mode. The Main Status indicators on each amplifier in  Reset –...
  • Page 53 7224 OPERATOR’S MANUAL – SECTION 6 Main Status Indicators for Multi-Amplifier Systems (cont.) Main Status of One or Main Status of More Amps in Other Amps in Action Needed to Return to the System the System State of Operation Run Mode Stop mode: When the Stop button on To release the system from Stop mode, any amplifier in the system is pressed, ...
  • Page 54 7224 OPERATOR’S MANUAL – SECTION 6 Fault Status Indicators for Multi-Amplifier Systems (cont.) 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 Load status: To remedy the Over...
  • Page 55 7224 OPERATOR’S MANUAL – SECTION 6 6.3.8 Multi-Amp System Output Capabilities Two 7224s in Series – High-Voltage Mode PEAK OUTPUT RMS OUTPUT 40 mSec Pulse, 5 Minutes, 1 Hour, 5 Minutes, 1 Hour, 20% Duty Cycle 100% Duty Cycle 100% Duty Cycle 100% Duty Cycle 100% Duty Cycle Ohms Volts Amps Volts Amps Volts Amps Volts Amps Volts Amps...
  • Page 56 7224 OPERATOR’S MANUAL – SECTION 6 Three 7224s in Series – High-Current Mode PEAK OUTPUT RMS OUTPUT 40 mSec Pulse, 5 Minutes, 1 Hour, 5 Minutes, 1 Hour, 20% Duty Cycle 100% Duty Cycle 100% Duty Cycle 100% Duty Cycle 100% Duty Cycle Ohms Volts Amps Volts Amps Volts Amps Volts Amps Volts Amps Watts 61.5 20.5 61.5 20.5...
  • Page 57 7224 OPERATOR’S MANUAL – SECTION 6 Three Paralleled 7224s – Mid-Level Mode PEAK OUTPUT RMS OUTPUT 40 mSec Pulse, 5 Minutes, 1 Hour, 5 Minutes, 1 Hour, 20% Duty Cycle 100% Duty Cycle 100% Duty Cycle 100% Duty Cycle 100% Duty Cycle Ohms Volts Amps Volts Amps Volts Amps Volts Amps Volts Amps Watts 1.34 49.2 49.2 34.8 34.8...

  • Page 58: Amplifier Signal Flow

    7224 OPERATOR’S MANUAL – SECTION 7 7 Amplifier Signal Flow 7.2 AC Mains Power Power to the amplifier is connected through a 20- 7.1 Input Signals amp IEC-type inlet connector with an integral EMI  The input signal is routed from the SIM (Specialized  filter network on the back panel.  AC mains power is  Input Module) on the back panel to the Main board.   first routed through the front panel switch/breaker,  From there, the signal is amplified through low-noise  then to the Power Supply board. From there, the AC operational amplifier gain stages, compensation  mains are distributed to the main power transform- networks, and current limiting/ODEP and then final  ers, and then from the transformers back through the ...

  • Page 59: Maintenance

    7224 OPERATOR’S MANUAL – SECTION 8 8 Maintenance 8.1 Clean Amplifier Filter and Grills 8.1.1 Tools Required Simple maintenance can be performed by the user The recommended equipment and supplies  to help keep the equipment operational. The fol- needed to perform the functions required for this  lowing routine maintenance is designed to prevent  task are described below. problems before they occur. See the “Trouble- shooting” section, for recommendations for •...

  • Page 60: Troubleshooting

    7224 OPERATOR’S MANUAL – SECTION 9 9 Troubleshooting 9.2 Visual Inspection Before attempting to troubleshoot the amplifier  9.1 Introduction & Precautions while it is operating, please take time to complete  This section provides a set of procedures for a visual inspection of the internal components of identifying and correcting problems with the 7224  the amplifier. amplifier. Rather than providing an exhaustive and  1. To perform a Visual Inspection, first turn the  detailed list of troubleshooting specifications, this  Breaker/Switch to the Off (O) position. section aims to provide a set of shortcuts intended 2.

  • Page 61: No Signal

    7224 OPERATOR’S MANUAL – SECTION 9 9.3 No Signal Missing Output signal may be caused by one of  the following: 5. Master/Follower Jumpers are set to the Follower  (down) position. The amplifier should only be  configured for Follower mode if it is in a multi- amplifier system; otherwise it should be set for  Master mode. See the “Advanced Configura- tion” section in this manual for more informa- tion. 6. Signal is not connected to any inputs on the  SIM card. See the “Amplifier Setup” section in this manual for more information. 9.4 No LEDs Illuminated or No Fans Figure 9.2 – Fuse F1 Location If none of the LEDs on the Display Panel are il-...

  • Page 62: Amplifier Overheats (Over Temp Fault Condition)

    7224 OPERATOR’S MANUAL – SECTION 9 9.7 Amplifier Overheats (Over Temp 9.7.3 Resetting After OverTemp Fault Condition) When the amplifier has cooled enough to eliminate  the OverTemp condition, it should automatically There are two possible reasons why the amplifier  is overheating: return to Run mode. If the amplifier fails to return  to Run mode, make sure fans are running, then  1. Excessive Power Requirements remove the input signal from the amplifier. Allow  2. Inadequate Airflow the fans to run for five minutes, and then push the  9.7.1 Excessive Power Requirements Reset button to reset the amplifier. If the amplifier  An amplifier will overheat if the required power ex- does not reset, it may require servicing. Please  ceeds the amplifier’s capabilities. High duty cycles  contact AE Techron Technical Support. and low-impedance loads are especially prone to 9.8 Fault LED is Illuminated cause overheating. To see if excess power require-...
  • Page 63 7224 OPERATOR’S MANUAL – SECTION 9 for one-way shipping charges as well as any cus- plifier for repair. It should be returned in its original  tom fees, duties, and/or taxes). Please review the  packaging or a suitable alternative. Replacement  Warranty at the beginning of this manual for more  packaging materials can be purchased for a nomi- information. nal fee. All service units must be given Return Authoriza- Please send all service units to the following ad- tion by AE Techron, Inc. before being returned.  dress and be sure to include your Return Authori- Return Authorizations can be requested on our  zation Number on the box. website or by contacting our Customer Service  AE Techron, Inc. Department. Attn: Service Department / RMA# 2507 Warren Street Please take extra care when packaging your am- Elkhart, IN 46516 Information subject to change 96-8005975 6-27-2021...
  • Page 64 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 ...
  • Page 65 7224 OPERATOR’S MANUAL – SECTION B Appendix B: Wire Current-Carrying Capacity Wire size or gauge should be selected to exceed  shows the minimum matching requirements of wire  the expected current it will carry. The chart below  gauge and continuous duty amperage limits. Continuous Duty Current* American Wire Gauge Diameter Diameter Mils (Amperes) (AWG) (mm) (.001 in) 10.40 9.27 8.25 7.35 6.54 5.19 4.12 3.26 2.59 2.05 1.63 1.29 1.02 *Minimum value for insulated wire in free air (i.e. not bundled). Figure B-1 – Wire Current-Carrying Capacity Chart Information subject to change 96-8005975...
  • Page 66 7224 OPERATOR’S MANUAL – SECTION C Appendix C: Critical Wire Lengths in Parallel Systems In Parallel applications, the output wiring branches  to each amplifier should match within ± ¼ inch.  Figure C-1 – Critical Wire Lengths in Parallel Systems Information subject to change 96-8005975 6-27-2021...
  • Page 67 7224 OPERATOR’S MANUAL – SECTION D Appendix D: Returning Follower Amplifiers to Stand-Alone Use The configuration settings required for Push/Pull  and Series system operation must be returned to the factory-default settings before a Follower  amplifier can be used as a stand-alone amplifier.  To reconfigure your Follower amplifiers for stand- alone use, complete the following. Change Amplifier Main Board Settings (Push/ Pull or Series configurations) WARNING Do not attempt to access the Main Board while the amplifier is running.
  • Page 68 7224 OPERATOR’S MANUAL – SECTION D Remove Follower Labels (optional) We recommended removing any “Follower” ampli- fier labels to avoid later confusion or errors.  Reconfigure SIM-BNC-OPTOC Cards (Series configurations) Refer to Figures D-3 and D-4 for SIM-BNC-OP- TOC factory-default settings. Note that for normal  stand-alone operation of an amplifier, the Master/ Follower jumpers should be returned to the factory Figure D.3 – SIM-BNC-OPTOC Master/Follower  defaults. Stand-alone amplifiers can operate with  Jumpers Location Input Connectors (Balanced/Unbalanced) jumpers  set to either OPEN or CLOSED, depending on the  user’s preference. 7224 amplifiers can operate as stand-alone ampli- fiers using the SIM-BNC-OPTOC as the input card.  Or, if you prefer, the SIM-BNC-OPTOC card can be removed and the standard SIM-BNC input card re-installed for stand-alone use.
  • Page 69 Appendix E: 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  AC or Can be great- Used for monitoring amplifier output  Voltage Monitoring: Connect a voltage meter to mon- 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 systems. Wired to am- Connect across PIN 1 (Amp Out) and PIN 10 (Sampled ...
  • Page 70 Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted OverTemp Over-temperature –24V When amp is normal, this pin Remote Signal of Over-Temperature Condition: LED,  output is pulled to –24V through a  when lit, signals Over Temperature condition. Use a 6  47.5K-ohm resistor; when amp is in mA series resistor of 4.7K-ohm for LED or OPTO, tie to  OverTemp state, this pin is ground- –24V source (PIN 13).
  • Page 71 Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted 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 I SUM3– Multiple Amplifier  Planned for use in multiple amplifier  Currently not used. Summing, Ampli- configurations - paralleled and run- fier 3 ning Controlled Current Mode OverLoad Out Overload output –24V When amp is normal, this pin Remote Signal of Overload Condition: LED, when lit, ...

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