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Summary of Contents for Aetechron 7228
- Page 1 7228 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 United States and all taxes, duties, and other customs AE Techron, Inc. fees for such foreign shipments.) Customer Service Department 2507 Warren Street HOW TO OBTAIN WARRANTY SERVICE Elkhart, IN 46516 When you notify us of your need for warranty service, U.S.A. 574.295.9495 www.aetechron.com...
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Page 3: Declaration Of Conformity
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: 7228 EMC Standards: EN 61326-1: 2013 – Electrical Equipment for Measurement, Control and Laboratory use —... -
Page 4: Table Of Contents
Contents 1 Introduction ............................5 1.1 Features ..........................5 1.2 Configuration Options......................5 2 Amplifier Unpacking and Installation ....................6 2.1 Safety First ..........................6 2.2 Unpacking ..........................6 2.3 Installation ..........................6 3 Connections and Startup .......................7 3.1 Other Operation Modes and Configurations................7 3.2 Connecting the Load ......................7 3.3 Connecting the Input Signal ....................8 3.4 Other DIP Switch Settings .....................9 3.5 Using the Expansion Port ......................9 3.6 Connecting the AC Supply ....................9 3.7 ... -
Page 5: Introduction
7228 OPERATOR’S MANUAL – SECTION 1 Figure 1.1 – 7228 Front Panel 1 Introduction Congratulations on your purchase of the 7228 Performance Overview power amplifier. The 7228 was developed to bring performance improvements and an extended fea- Small Signal Bandwidth DC - 1 MHz ture set when compared to AE Techron’s industry standard 7224 amplifier. The 7228 amplifiers are Max Continuous Power, 20 kHz 1000 watts built and tested to the most stringent quality stan- dards for long life and outstanding performance. Max Continuous Power, 150 kHz 400 watts The AE Techron brand is known throughout the world for its robust precision amplifiers as well as Current Limit its product service and support. 100V/µs Slew Rate 1.1 Features The 7228 is a single-channel linear amplifier de-... -
Page 6: Amplifier Unpacking And Installation
7228 OPERATOR’S MANUAL – SECTION 2 2 Amplifier Unpacking and Installation The 7228 amplifier is a precision instrument that Along with any additional accessories purchased can be dangerous if not handled properly. Lethal by the customer, all 7228 amplifiers ship with the voltages are present in both the AC input supply following: and the output of the amplifier. For this reason, 7228 Amplifier • safety should be your primary concern when you Toolkit (contains one #2 Phillips screwdriver • setup and operate this amplifier. and four rubber feet) Power Cord • 2.1 Safety First 7228 Operator’s Manual and Quick Start sheet • Throughout this manual special emphasis is 2.3 Installation placed on good safety practices. The following graphics are used to highlight certain topics that The 7228 amplifiers are packaged in a rugged require extra precaution. powder-coated aluminum chassis. This chassis is 2U (rack units) tall, and has rack “ears” on each DANGER side of the front panel for mounting to a standard EIA (Electronic Industries Association) rack. Use DANGER represents the most severe standard rack mounting hardware to mount the ... -
Page 7: Connections And Startup
7228 OPERATOR’S MANUAL – SECTION 3 Figure 3.1 – 7228 Back Panel 3 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 7228 amplifier operating in Controlled-Voltage mode (factory default). Before For Series operation in Controlled-Voltage connecting the amplifier, make sure the AC power mode, refer to the topic “Multiamp Systems for cord is unplugged. Increased Current or Voltage” in the Applications WARNING section of this manual for information on Series system configuration. ELECTRIC SHOCK HAZARD. For Series operation in Controlled-Current Output potentials can be lethal. Make mode, you should select one amplifier to be oper-... -
Page 8: Connecting The Input Signal
7228 OPERATOR’S MANUAL – SECTION 3 Always use the appropriate wire size and insula- tion for the maximum current and voltage expected at the output. Never connect the output of the amplifier to any other model amplifier, power sup- ply, signal source, or other inappropriate load; fire can result. 3.2.2 Connecting the Outputs Connection to the output of the amplifier is to a 3-position terminal strip with #8 screws. Wires terminated with #8 ring terminals, tinned wires up to 10 AWG in size, or bus bars with 0.18 in. (4.6 Figure 3.3 – Wiring for Unbalanced or Balanced mm) holes are recommended when connecting to Input Connector the output terminals. Connect the load across the terminals marked “OUTPUT” (positive) and “COM” high quality and shielded to minimize noise and to (negative/ground). The third terminal, “CHASSIS guard against possible feedback. GROUND” can be connected to an external ground DIP switch #5, located on the DIP switch panel point such as the rack chassis. See Figure 3.2. above the SIM card, can be used to select bal- IMPORTANT: DO NOT connect the load to the anced or unbalanced input wiring, and also can “CHASSIS GROUND” terminal. -
Page 9: Other Dip Switch Settings
7228 OPERATOR’S MANUAL – SECTION 3 3.6 Connecting the AC Supply tions by connecting/disconnecting the inverting (–) pin on each input connector to the amplifier ground The power cord connects to a standard 20A 3-pin through a 5-ohm resistor (see Figure 3.5). IEC-type male connector on the back panel (see Figure 3.6). Make sure the Breaker/Switch on the When DIP switch #5 is placed in the UP position front panel is switched to the OFF (O) position. (factory default), the shield on the BNC connector Make sure the power cord is inserted and seated and the inverting (–) pin on ther terminal block con- fully into the IEC connector by moving it slightly nector are tied to the amplifier ground, allowing the back and forth and up and down while pushing connectors to be used for Unbalanced input wiring. in. The power cord is relatively stiff and should be When DIP switch #5 is placed in the DOWN posi- routed so that there is no excessive force pulling to tion, the inverting pin on the terminal block connec- the sides or up or down that would stress the pins tor is floating, allowing the connector to be used for or internal connections. balanced input wiring. 3.7 Start-up Procedure IMPORTANT: DIP switch #5 can also function 1. -
Page 10: Amplifier Operation
7228 OPERATOR’S MANUAL – SECTION 4 4 Amplifier Operation 4.1 Front-Panel Controls This section provides an overview of Front-Panel controls and indicators found on the 7228. 4.1.1 Power Switch The Power Switch controls the AC mains power to the amplifier. Switch to the ON position (|) to turn the amplifier on. Switch to the OFF position (O) to turn the amplifier off. See Figure 4.1. Figure 4.1 – Power Switch 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). 4.1.2 Gain Control The Gain Control Knob increases/decreases the gain from 0 – 100% of the overall Gain (factory default Gain is 20V/V in voltage mode and 5A/V in current mode). Turn the Gain Control fully clock- wise for maximum amplifier output. See Figure Figure 4.2 – Gain Control 4.2. See the Advanced Configuration section for information on how to make the amplifier fixed-... - Page 11 7228 OPERATOR’S MANUAL – SECTION 4 to the UP position and the amplifier will automatically return to Run mode. Remote Standby mode (Ready and Standby LEDs lit): The amplifier is functioning properly and all Fault Status modes are clear, but the unit has been placed in Standby by an external condition. If the amplifier has been configured as a Series Slave (DIP switch #1 DOWN), it will enter Remote Standby mode when the Enable button is pressed Figure 4.3 – Push Buttons and remain in that mode until it receives the En- able signal from an interlocked Master amplifier. If an amplifier is disabled using a Remote Standby switch, the amplifier will be placed in Remote ...
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Page 12: Front-Panel Indicators
7228 OPERATOR’S MANUAL – SECTION 4 4.2 Front-Panel Indicators Figure 4.5 details the operational modes indicated 4.2.1 Main Status Indicators by the Main Status indicators. Four Main Status indicators are located on the am- plifier’s front-panel (see Figure 4.4). These LEDs NOTE: See the “Applications” section for main monitor the internal conditions of the amplifier and status indicator interpretation when operating a indicate the current state of operation. The chart in multi-amp system. Figure 4.5 – Main Status Indicators Indicator is lit Indicator is not lit Indicator may be lit... -
Page 13: Fault Status Indicators
7228 OPERATOR’S MANUAL – SECTION 4 4.2.2 Fault Status Indicators Depending on the fault condition and the configu- Four Fault Status indicators are located on the ration of the unit, the amplifier may be placed in amplifier front panel (see Figure 4.4). These LEDs Standby/Fault mode when a fault condition oc- monitor the internal conditions of the amplifier curs. Refer to the chart in Figure 4.6 to determine and will illuminate when a fault condition occurs. Figure 4.6 – Fault Status Indicators Indicator is lit... -
Page 14: Back-Panel Controls And Connectors
7228 OPERATOR’S MANUAL – SECTION 4 the fault condition being indicated and the action Output Terminal Strip – Connect output lines required to clear the fault condition. from the load to this 3-position terminal strip with #8 screws. It accepts up to 10 AWG wire. NOTE: See the “Applications” section for fault status indicator interpretation when operating a Unbalanced BNC Input Connector – This input multi-amp system. option provides a standard unbalanced input. Balanced WECO Input Connector – This input Back-Panel Controls option provides a balanced input. and Connectors This section provides an overview of Back-Panel Expansion Port – This 62-pin, D-sub connector ... -
Page 15: Advanced Configuration
7228 OPERATOR’S MANUAL – SECTION 5 5 Advanced Configuration Enable DC Servo to ensure DC offset remains • at zero and safely drive coils and transformers. The 7228 amplifier was designed to offer excep- Change the maximum amplifier gain from 20:1 tional versatility in operation. You can choose from • to 6:1. a range of field-configurable options, including: Operate with variable gain control or at a fixed • Operate as a stand-alone amplifier or as part of • gain setting of 20. a multiple-amplifier system. Configure the amplifier to enter Standby on • Select DC-coupled or AC-coupled operation. • startup Select Controlled-Current or Controlled-Voltage • Configure the amplifier to enter Standby when • modes of operation. an overload condition occurs. Configure the bi-level power supply for use in • Configure the automatic multi-speed fans to • high voltage applications, high current applica- operate always on high-speed, or always on tions, or for applications requiring mid-level ... - Page 16 7228 OPERATOR’S MANUAL – SECTION 5 amplifier from Standby/Stop mode and enter Re- When the Parallel Matching DIP switch is in the UP position (default), the Parallel Matching function is mote Standby mode. The amplifier will remain in disabled. When this switch is in the DOWN posi- Remote Standby mode until it receives the Enable tion, Parallel matching is enabled. signal from an interlocked Master amplifier. SW#4: Signal Ground If the Series Mode DIP switch is placed in the When the Signal Ground DIP switch is in the UP DOWN position while the Parallel Mode DIP switch position (default), the amplifier’s negative (–) is also in the DOWN position, the amplifier will output terminal is connected to ground through a be placed in Standby/Stop mode. Pressing the PTC (resettable fuse) that protects the amplifier Enable button will not release the amplifier until at from ground loops, circulating currents, and other least one of the Series Mode or Parallel Mode DIP potentially harmful conditions. The PTC will toler- switches is placed in the UP position. ate up to 30V delta between signal and chassis For more information on multi-amplifier system ground before a fault condition is triggered and configuration and operation, see the Applications the amplifier is placed in Standby. To release the section. amplifier from Standby, remedy the cause of the SW#2: Parallel Mode fault condition, and the amplifier will automatically When this switch is in the UP position (default), the be returned to operational conditions. amplifier will function as a stand-alone amplifier or When this switch is in the DOWN position, the ...
- Page 17 7228 OPERATOR’S MANUAL – SECTION 5 and allows the WECO connector to function as a suitable for your application. For more information balanced input. on Controlled-Current operation, including how to determine and configure a custom compensation SW#6: Input Coupling When the Input Coupling DIP switch is in the UP network, see the Applications section. position (default), the amplifier can receive and NOTE: If the Controlled Mode DIP switch set- amplify both DC and AC signal. When this switch ting is changed while the amplifier is enabled, the is in the DOWN position, a 2-Hz high-pass filter on amplifier will temporarily be placed in Standby/ the inputs prevents the transmission of DC signal. Stop mode. Press the Enable button to release the amplifier. NOTE: Both the Input Coupling and DC Servo DIP switches must be placed in the DOWN position SW#8: Bi-level Mode when activating the DC Servo function. Placing the When the Bi-level Mode DIP switch is in the UP Input Coupling DIP switch in the UP position and position (default), the amplifier will automatically the DC Servo DIP switch in the DOWN position will switch the power supply transformers between a cause the amplifier to be placed in Standby/Stop series and a parallel configuration, depending on mode. To return the amplifier to operational condi- the present voltage requirements of the applica-...
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Page 18: Internal Jumpers And Settings
7228 OPERATOR’S MANUAL – SECTION 5 increased voltage or current, see the Applications ON = DIP Switch UP OFF = DIP Switch DOWN Current section. SW#13 SW#14 SW#15 SW#16 Limit NOTE: If the Power Supply Rail Mode DIP switch setting is changed while the amplifier is enabled, the amplifier will temporarily be placed in Standby/ Stop mode. Press the Enable button to release the amplifier. SW#11: DC Servo The DC Servo function ensures that no DC offset is present at the signal output (-3 dB at 20 Hz). Select DC Servo when driving transformers or other coils. When the DC Servo DIP switch is in the UP position (default), the DC Servo function is disabled. When this switch is in the DOWN posi- tion, the DC Servo function is enabled. NOTE: Both the Input Coupling and DC Servo DIP switches must be placed in the DOWN position when activating the DC Servo function. Placing the FAULT Input Coupling DIP switch in the UP position and Figure 5.2 – Current Limit Switch Configurations the DC Servo DIP switch in the DOWN position will to operational conditions, set at least one of the cause the amplifier to be placed in Standby/Stop current-limit DIP switches in the UP position. mode. To return the amplifier to operational condi- tions, set both the DC Servo and the Input Cou- 5.2 Internal Jumpers and Settings pling DIP switches in the DOWN position or place ... - Page 19 7228 OPERATOR’S MANUAL – SECTION 5 2. Use the T-15 Torx wrench to remove the eight DANGER (8) Torx screws, as shown in Figure 5.3. 3. Lift the cover straight up to remove and set Uninsulated terminals with AC mains potential are exposed when the top aside. cover is removed. Do not proceed until 4. To replace the top cover, slide the cover in to the amplifier has been turned off and the place on the amplifier and replace the eight AC Mains has been disconnected.
- Page 20 2 and 3. When a distortion between the two waveforms of more than 0.5% occurs, the IOC circuit will Remove the shunt from the jumper to disable both activate, and the Overload LED will light, but the CC1 and CC2 networks. A small feedback capaci- amplifier will continue to operate. To configure the tor remains in the circuit to provide stability when 7228 to move to Standby (Fault mode) when the operating into an 8-ohm load. For more information IOC circuit is activated, locate the Overload Latch on Controlled-Current operation and installing a (see Figure 5.5) and place a shunt across the two custom RC network, see the “Applications” sec- pins of the jumper. tion of this manual.
- Page 21 7228 OPERATOR’S MANUAL – SECTION 5 ensure that signals above 50 kHz are not ampli- temperature of 44°C and/or the ODEP circuit fied. senses high current above 5V. When these conditions occur, the fans are turned ON HIGH. To enable the low pass filter, locate the Low Pass/ When the amplifier heat sinks cool to a temper- • LP Bypass jumpers (see Figure 5.5) and move the ature of 40°C, the fans are reduced to LOW. shunt from pins 2 and 3 (LP Bypass) and place If an Overtemp Fault occurs, the fans will be • across pins 1 and 2 (Low Pass). turned ON HIGH and operate in that state until ...
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Page 22: Applications
7228 OPERATOR’S MANUAL – SECTION 6 6 Applications 6.1 Power Supply Settings for Increased formers will automatically be switched to a series Voltage or Current configuration to provide up to 180V output. The 7228 amplifier features a bi-level power sup- When the 7228 senses that the voltage required ply that contains two, dual-secondary transform- has dropped below the 90V limit, the transformers ers. The secondary rails of each transformer and will automatically be returned to a parallel configu- the two transformers themselves can be placed in ration, reducing heat output and increasing operat- a series or parallel configuration, as shown in Fig- ing efficiency. ure 6.1, providing a range of options for operating ... -
Page 23: Multi-Amp Systems For Increased Voltage Or Current
7228 OPERATOR’S MANUAL – SECTION 6 Refer to the chart in Figure 6.2 for recommended In the same way, the two secondaries in each transformer can be configured for a fixed series applications and expected output voltage based on or parallel operation. Use the Power Supply Rail the various DIP switch settings. Mode DIP switch to select the HV setting for a series configuration (default), or the HC setting for a parallel configuration. LOAD (ohms) DIP SWITCH SETTING OUTPUT MANUAL RECOMMENDED VOLTAGE SW#8 SW#9 SW#10 BI-LEVEL APPLICATIONS Continuous Pulse RAIL Down Down Down High current operation... - Page 24 Potentially lethal voltages and currents are pres- amplifiers in the system configured as Slave ampli- ent within the 7228 amplifiers. While the amplifiers’ fiers. Do not operate with more than one Master chassis are earth-grounded, all internal grounds in your multiamp system unless instructed by AE are floating. Particularly in series systems, all Techron Technical Support. internal grounds of Slave amplifiers could carry lethal voltages. Use Only 7228 Amplifiers Use only AE Techron 7228 amplifers to construct a 7228 multiamp system. Do not combine different models of AE Techron amplifiers in the same sys- WARNING tem or use amplifiers made by another manufac- turer in a 7228 multiamp system. Such improper ELECTRIC SHOCK HAZARD. connections could damage the amplifiers. Output potentials can be lethal. Make Use Correct Wiring connections only with AC Power OFF and input signals removed.
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Page 25: Dip Switch Settings
7228 OPERATOR’S MANUAL – SECTION 6 6.2.2 Two in Series, Single-Ended 69-8004125) from the back-panel Expansion Configuration Port on the Master amplifier to the Expansion To configure and connect two amplifiers for opera- Port on the Slave amplifier. tion in a series configuration, begin by designating 2. Connect from a signal generator to the BNC one amplifier as the Master amplifier, and the other signal input connector on the Master amplifier’s amplifier as the Slave amplifier. Consider placing a back panel. “Master” or “Slave” label on each amplifier’s back 3. Using wiring appropriate for your application, panel to clarify the amplifier designation during connect from the Master amplifier’s back-panel setup and operation. OUTPUT connector to the Slave amplifier’s back-panel COM connector. Make sure both amplifiers are disconnected from 4. Using wiring appropriate for your application AC power. and your load, connect from the Slave ampli- DIP Switch Settings fier’s OUTPUT connector to the load’s positive On the amplifier designated as the Slave amplfier, terminal. make the following changes to the back-panel DIP 5. Connect from the load’s negative terminal to ... - Page 26 7228 OPERATOR’S MANUAL – SECTION 6 6.2.5 Multiamp System Operation fier’s back panel to clarify the amplifier designation during setup and operation. In multiamp systems, the Master amplifier controls Make sure both amplifiers are disconnected from several operating functions for all amplifiers in- AC power. cluded in the system, so Slave amplifiers are said to be “interlocked” with the Master amplifier. The DIP Switch Settings functions controlled by the Master amplifer include On the amplifier designated as the Slave amplfier, input signal, operating status, mode of operation set DIP switch #2 in the DOWN (Master Slave) (controlled-voltage or controlled-current operation) position and amplifier compensation. On both amplifiers, set DIP switch #3 in the Because the amplifiers in a multiamp system are DOWN (Parallel Matching ON) position...
- Page 27 7228 OPERATOR’S MANUAL – SECTION 6 Stop mode and place all other amplifiers in the operational status of the amplifier. When evaluated system in Remote Standby mode. along with the statuses of other amplifiers in the system, the Main Status indicators can be used Reset – Pressing the Reset button on the ampli- to determine the system status and the action fier reporting a fault condition will return all of the required to return the system to Run mode. See amplifiers to Run mode if the condition causing the Figure 6.6. fault condition has been cleared and the ampli- Fault Status Indicators for Multi-Amp fier has been configured for startup in Run mode. Systems However, pressing the Reset button on other am- plifiers in the system (not reporting a fault condi- The four Fault Status indicators located on each tion) will NOT clear the fault condition. Refer to the ...
- Page 28 7228 OPERATOR’S MANUAL – SECTION 6 Figure 6.6 – 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 29 7228 OPERATOR’S MANUAL – SECTION 6 Figure 6.7 – 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 30 7228 OPERATOR’S MANUAL – SECTION 6 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 ...
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Page 31: Expansion Port Applications
7228 OPERATOR’S MANUAL – SECTION 6 6.3 DB-62 Expansion Port Applications SIM2 Breakout Accessory All amplifier configurations that can be performed AE Techron 7228 amplifiers come with a SIM2- using the back-panel DIP switches, as well as all BNC input module that also contains a female, status conditions reported by the amplifier’s front- 62-pin D-Sub connector labeled as the Expansion panel LEDs, can also be performed remotely using Port. The Expansion Port is used to provide the the Expansion Port and the SIM2 Breakout Acces- amplifier interconnect for multi-amplifier applica- sory (part number 69-8004155) (see Figure 6.9). tions and also can be used to provide remote con- figuration, control and monitoring of the amplifier. 6.3.1 Expansion Port Accessories AE Techron offers three accessories to be used with the Expansion Port to aid in these extended applications. DB-62 Multi-amp Cables The Series cable (part number 69-8004125) and Parallel cable kit (part number 69-8004164) con- tain 36-inch Expansion Port cables that can be used for amplifier interlock and signal sharing for Two-in-Series or Two-in-Parallel multiamp appli- cations. For installation instructions, refer to the topic “Multiamp Systems for Increased Voltage or ... - Page 32 7228 OPERATOR’S MANUAL – SECTION 6 6.3.2 SIM2 Breakout Accessory In addition, control functions such as Blanking, Applications Reset and Enable from Standby can be performed remotely using the Expansion Port and the SIM2 The following suggested applications show some of the possible uses of the SIM2 Breakout Ac- Breakout Accessory. cessory. Note that the procedures outlined in this Refer to Figure 6.10 for a quick reference of the section assume competence on the part of the Expansion Port pinouts. A detailed chart of all Ex- reader in terms of amplifier systems, electronic pansion Port pinouts and suggested applications is components, and good electronic safety and work- provided in Appendix 1. ing practices. REMOTE AMPLIFIER STATUS Use T-1 LEDs and high-quality wire to build the The SIM2 Breakout Accessory can be used to circuit. Figure 6.11 details the circuit required for create a circuit to monitor remotely one or more amplifier conditions, including Run status, Fault, ...
- Page 33 7228 OPERATOR’S MANUAL – SECTION 6 Remote Signal of Run Condition set command. See the “Troubleshooting” section Purpose: LED, when lit, signals a Run state. for more information on diagnosing and clearing Method: Tie Run (PIN 46) to Analog Ground (PIN this fault condition. 22, 23 or 24). Remote Signal of Over Temp Condition Signal Type: DC Purpose: LED, when lit, signals an over tempera- Level when Asserted: 15V ture condition. Level when Deasserted: 0V Method: Tie Over Temp Output (PIN 49) to Analog ...
- Page 34 7228 OPERATOR’S MANUAL – SECTION 6 REMOTE VOLTAGE OUTPUT MONITOR The SIM2 Breakout Accessory can be used to monitor remotely the voltage output of the ampli- fier. See Figure 6.12. Purpose: Use a voltage meter to monitor output voltage. Method: Connect a voltage meter to monitor the output voltage being produced by the amplifier. Connect across PIN 2 (Amp Out) and PIN 22,23 or 24 (Analog Ground). Do not connect to any imped- ance of less than 10k ohm. NOTE: Output is fused. Signal Type: AC or DC Level: Can be greater than ±200V peak. Figure 6.12 – Remote Voltage Output Monitor REMOTE CURRENT MONITOR The SIM2 Breakout Accessory can be used to monitor remotely the current output of the ampli- fier. See Figure 6.13. Purpose: Use a voltage meter to monitor output current. Method: Connect a voltage meter to monitor the output current being produced by the amplifier. Connect across PIN 52 (I MON+ Output) and PIN 22,23 or 24 (Analog Ground). For each 1V detect- ed, current output is 5A. Signal Type: AC or DC Level: 5A/V.
- Page 35 7228 OPERATOR’S MANUAL – SECTION 6 REMOTE CURRENT MONITOR, DIFFERENTIAL METHOD The SIM2 Breakout Accessory can be used to monitor remotely the current output of the amplifier when the output is not balanced. See Figure 6.14. Purpose: Use a voltage meter to monitor output current. Method: Connect a voltage meter to monitor the output current being produced by the amplifier. Connect across PIN 52 (I MON+ Output) and PIN 51 (I MON– Output). For each 1V detected, current output is 2.5A. Signal Type: AC or DC Level: 2.5A/V. Figure 6.14 – Remote Current Monitor, Differential Method REMOTE STANDBY/ENABLE/INTERLOCK The SIM2 Breakout Accessory can be used to remotely place the amplifier in Standby mode and return the amplifier to Run mode. See Figure 6.15. Purpose: Use a switch or optocoupler to remotely disable the amplifier and place it in Standby mode. Also, return the amplifier from Standby mode to the Run condition. Method: Short PIN 21 of amplifier to Interlock Ground (PIN 20) using a dry contact switch or optocoupler. When Interlock (PIN 21) is shorted ...
- Page 36 7228 OPERATOR’S MANUAL – SECTION 6 REMOTE RESET/ENABLE/BLANKING The SIM2 Breakout Accessory can be used to remotely mute the amplifier, release from Standby mode, and Reset the amplifier after a fault condi- tion has occurred. See Figure 6.16. Blanking Control Purpose: Use switch or optocoupler to remotely mute the amplifier. Method: Assert 5-15VDC between ISO-GND (PIN 62) and BLANKING INPUT (PIN 59) to activate the blanking feature. Signal Type: DC Level when Asserted: 5 - 15V Level when Deasserted: 0V Note: Amplifier output is muted when asserted. Normal amplifier operation when deasserted. Reset after Fault Purpose: Reset the amplifier after a fault condition has occurred.
- Page 37 7228 OPERATOR’S MANUAL – SECTION 6 Figure 6.17 – All DIP switch functions can be controlled remotely using the SIM2 Breakout Accessory Figure 6.18 – Remote DIP Switch Control Sample Application Information subject to change 97-8004188-B_04-03-18...
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Page 38: Controlled Current Operation
7228 OPERATOR’S MANUAL – SECTION 6 6.4 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. 6.4.1 Controlled-Voltage vs. Controlled- Current Modes of Operation Figure 6.19 – Input to Output Comparison, AE Techron 7228 amplifiers can be field-config- Controlled-Voltage Operation ured to operate as Voltage Amplifiers (Voltage- Controlled Voltage Source) or as Transconduc- tance Amplifiers (Voltage-Controlled Current Source). The mode selection is made via jumpers on the amplifier’s UFEB board. 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 Figure 6.20 – Input to Output Comparison, to the control (input) voltage. If the load’s imped- Controlled-Current Operation ance changes, the amplifier will seek to maintain ... - Page 39 7228 OPERATOR’S MANUAL – SECTION 6 6.4.3 Controlling Compensation for ing in Controlled Current (CC) mode, the amplifier CC Operation load becomes an integral part of the system. In AE Techron 7228 amplifiers can be configured for order to ensure system stability and to control available bandwidth, compensation via an RC either Controlled Voltage (CV) or Controlled Cur- network is required for CC operation. The following rent (CC) mode of operation. When operating the steps will allow you to compensate your amplifier amplifier in Controlled Voltage (CV) mode, com- for operation in CC mode safely and effectively. pensation is not required. However, when operat- STEP 1: Check Amplifier Operation in CV mode. We recommend that you power-up and enable Once this initial check is completed, power down the amplifier in Controlled Voltage mode without the amplifier, attach your load, and move the back- attaching a load before configuring your amplifier panel Controlled Mode DIP switch (SW#7) to the ...
- Page 40 7228 OPERATOR’S MANUAL – SECTION 6 STEP 4: (Optional) Verify Suitability of Default Compensation (CC1) If desired, the following values of the components Compensation Resistor: 75k ohms contained in the default RC network can be used Compensation Capacitor: 47 nF with the formulas provided in STEP 5 below to Parallel Capacitor: 100 pF verify the suitability of the default compensation for your uses. STEP 5: Calculating Values for an RC Network for Custom Compensation If the default RC network does not provide suit-...
- Page 41 7228 OPERATOR’S MANUAL – SECTION 6 Figure 6.22 – Custom Compensation Component Locations Figure 6.25 – Square Wave Showing an Increase in R is Required If the output current waveform is neither un- Figure 6.23 – Compensation Effects on Waveform derdamped or overdamped, but the top of the If the output current waveform is ringing, the circuit squarewave is not level, then you should instead is underdamped: You have too much compensa- decrease the capacitor value (see Figure 6.26). tion and should lower the resistance (see Figure 6.24). Figure 6.26 – Square Wave Showing a Decrease in C is Required Figure 6.24 – Square Wave Showing a Decrease in R is Required When making adjustments: Resistor: Increase or decrease resistance values If the output current waveform is rounded, the in increments of +/- 10%. circuit is overdamped: You have too little compen- Capacitor: Incrementally decrease capacitor val- sation and should increase resistance (see Figure 6.25). ues by a factor of 2 or 3.
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Page 42: Dc Servo
7228 OPERATOR’S MANUAL – SECTION 6 After final adjustments have been made to the Use the DC Servo function when powering coils or circuit, the final waveform for your planned appli- transformers to minimize circulating DC currents cation should be tested to confirm the amplifier’s and avoid harmful overheating. Especially when compensation setting. using coupling transformers like the AE Techron T- Series transformers, use of the DC Servo function NOTE: is recommended. If possible, use 1% metal film resistors. AE • NOTE: The DC Servo and AC Coupling functions Techron discourages installation of potentiome- work together to achieve the best control of DC ters in the resistor location of the compensation offset and drift. While AC Coupling can be enabled circuit because this can decrease stability and individually, if the DC Servo function is enabled may increase inductance. while the AC Coupling function is disabled, the The parallel capacitor in the RC network serves • amplifier will automatically be placed in Standby to increase stability but can be removed, if it is mode. To return the amplifier to operational condi-... -
Page 43: Maintenance
7228 OPERATOR’S MANUAL – SECTION 7 7.1 Clean Amplifier Filter and Grills 7 Maintenance 7.1.1 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 problems before they occur. See the Trouble- task are described below. shooting section, for recommendations for re- Vacuum cleaner • storing the equipment to operation after an error Damp cloth (use water only or a mild soap • condition has occurred. diluted in water) To ensure adequate cooling and maximum ef- Preventative maintenance is recommended after ficiency of the internal cooling fans, the amplifier’s ... -
Page 44: Troubleshooting
7228 OPERATOR’S MANUAL – SECTION 8 8 Troubleshooting 6. Look for any foreign objects lodged inside the unit. 8.1 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 7228 please return it to AE Techron for repair. amplifier. Rather than providing an exhaustive and detailed list of troubleshooting specifications, this 8.3 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. 9. One or both of the Master/Slave DIP switches The procedures outlined in this section are direct- are set to the Slave (down) position. The amplifi- ed toward an experienced electronic technician; er should only be configured for Slave operation it assumes that the technician has knowledge of if it is in a multi-amplifier system; otherwise both typical electronic repair and test procedures. the Series Master/Slave and the Parallel Master/ Slave DIP switches should be set to the Master Please be aware that the 7228 will undergo fre- (up) position. See the Advanced Configuration... -
Page 45: Standby And Stop Leds Remain Illuminated
8.8.1 Excessive Power Requirements amplifier until one or both of these switches is An amplifier will overheat if the required power ex- placed in the UP position. 15. If the Expansion Port is being used, the ampli- ceeds the amplifier’s capabilities. High duty cycles fier might be held in Remote Standby mode by and low-impedance loads are especially prone to cause overheating. To see if excess power require- another device. For more information on 7228 Remote Operation, see the Applications sec- ments are causing overheating, check the follow- tion in this manual. ing: 8.7 Standby LED Remains Illuminated 21. The application’s power requirements fall within the specifications of the amplifier. See Activation of the Ground-Loop Protection Circuit the Specifications section. -
Page 46: Fault Led Is Illuminated
7228 OPERATOR’S MANUAL – SECTION 8 8.8.2 Check for Inadequate Airflow CAUTION 24. Check air filters. Over time they can become dirty and worn out. It is a good idea to clean the air filters periodically with a mild detergent Shut off the signal source before reset- ting the amplifier. Try resetting the Fault and water. condition only once. If the Fault condi- 25. Visually inspect fans to assure correct op- tion does not clear after one reset, STOP. -
Page 47: Specifications
Front Panel LED Displays indicate: Performance Ready, Standby, Fault, Over Temp, Over Voltage, Overload Testing was done at 100 Hz. Continuous DC power levels are lower. See DC Specifications chart. Soft Touch Switches for: Run, Stop, Reset 7228 accuracy was measured when driven into a 10-ohm load with between 0.1VDC and 6VDC or between 0.2VAC and 5VAC Gain Control, when enabled: presented at its inputs. Voltage gain adjustable from 20 to 0 Small Signal Frequency Response: DC - 400 kHz, +0.0 to -1.0 dB On/Off Breaker Series configuration supported to 200 kHz... - Page 48 7228 OPERATOR’S MANUAL – SECTION 9 Dimensions: 19” x 22.75” x 3.5” (48.3 cm x 57.8 cm x 8.9 cm) DC Specifications – Protection High-Current Mode Over/Under Voltage: OUTPUT (Amperes) ± 10% from specified supply voltage amplifier is 5 Minutes, 1 Hour, 100% Duty Cycle 100% Duty Cycle forced to Standby Over Current: Breaker protection on both main power and low volt- age supplies 13.5 Over Temperature: Separate Output transistor, heat sink, and transform- er temperature monitoring and protection AC Specifications – High-Voltage Mode PEAK OUTPUT RMS OUTPUT 40 mSec Pulse, 5 Minutes,...
- Page 49 7228 OPERATOR’S MANUAL – SECTION 9 Information subject to change 97-8004188-B_04-03-18...
- Page 50 Appendix A: Accessory Connector Pinouts and Functions Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted Amplifier Used for driving Used for driving slave amplifiers in Multi-amplifier Series Slave Output: Connect to the AC or Can be Output slave amplifiers in greater than multi- amp systems. Wired to am- Series Slave In + (Pin 44) when used in Multi-amplifier (Fused) ±200V peak plifier output. Do not connect to any ...
- Page 51 Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted Current Limit 5V to 15V The DIP switch needs to be in the Remote Control: Remote control to set the Current Same function as bit 2 (16A) DIP Switch of same UP position for this input to function. Limit Reference Isolation Ground (Pin 62). name Current Limit 5V to 15V The DIP switch needs to be in the Remote Control: Remote control to set the Current Same function as bit 3 (32A) DIP Switch of same UP position for this input to function. ...
- Page 52 Asserted Deasserted Gain 20:1/6:1 5V to 15V The DIP switch needs to be in the Remote Control: Remote control to set the Gain to 6:1. Same function as DIP Switch of same UP position for this input to function. Default is 20:1. When Asserted, the Gain will be set to Reference Isolation Ground (Pin 62). 6:1. name Unit ID Output The amplifier model 7228: 4V The Unit ID is based on a voltage Identifies which model the amplifier is. ID via voltage level. divider circuit between 0 to 15V. +24V Output +24V DC Output +24 V DC, 30 mA max, referenced Used in status reporting applications. See Run (PIN (Fused) to Analog Ground (PINS 22, 23, and 46), OverVoltage (PIN 47), OverLoad (PIN 48), Over- 24). Actual output is between 21V Temp (PIN 49) and Amp Fault (PIN 50). and 24V. Output is fused.
- Page 53 Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted Differential Slave Used in multiple amplifier configura- Multi-amplifier: Connect to Analog Ground (Pin 22, 23, Series Slave AC or Can be Input greater than tions in Series Mode. or 24) when the amplifier is in Slave Mode. In - ±200V peak Differential Slave Used in multiple amplifier configura- Multi-amplifier: Connect to Amplifier Output (Pin 1) Series Slave AC or Can be Input greater than tions in Series Mode. ...
- Page 54 Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted Amp Fault When the amplifier is in a Fault Remote Signal of Amplifier Fault Condition: Output Indicates a fault Output indicates if a fault condition exists. condition state, the level is asserted and the output is tied to 15V through a 2k ohm resistor. When the amplifier is in normal operation, the output level is at 0V (Analog Ground). The output is limited to 7 mA. Reference ...
- Page 55 Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted Amp Reset Reset 5V to 15V Used to Reset the amplifier. Reset from Standby: When asserted for at least 100 Input milliseconds, will return the amplfier to Ready/Run con- dition after Overload. Amp Enable 5V to 15V Used to Enable amplifier from Amplifier Enable: When asserted for at least 100 milli- Enable Input seconds, Enables the amplfier from standby. standby. Isolated Ground Attach the ground from the power Ground reference for use with Blanking, Amp Reset, and Isolated Ground supply when used for Blanking, Amp Amp Enable signals and DIP Switch pins. Reset, Amp Enable, and/or DIP Switch Functions to this pin. Gray shaded areas indicate pin not used / Blue shaded areas indicate used only Green shaded areas indicate DIP switch equivalent.
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