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- Page 1 7548/7794/7796/7796HC Operator’s Manual Single-Channel Industrial Amplifiers for Demanding, High-Power Systems APPLIES TO UNITS WITH MAINBOARD PART NUMBER 65-8005300-H 574.295.9495 | www.aetechron.com 2507 Warren Street, Elkhart, IN 46516...
- Page 3 This includes any damage to ITEMS EXCLUDED FROM WARRANTY This AE Techron Warranty is in effect only for failure another product or products resulting from such a defect. of a new AE Techron product which occurred within the Warranty Period.
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Page 4: Declaration Of Conformity
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: 7548 EMC Standards: EN 61326-1: 2013 – Electrical equipment for measurement, control and laboratory use —... - Page 5 574-295-9495 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: 7794 EMC Standards: EN 61326-1: 2013 – Electrical equipment for measurement, control and laboratory use —...
- Page 6 574-295-9495 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: 7796 EMC Standards: EN 61326-1: 2013 – Electrical equipment for measurement, control and laboratory use —...
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Page 7: 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 2.4 Connecting the Load ......................9 2.5 Connecting the Input Signal ....................10 2.6 Connecting the AC Supply ....................2.7 Start-up Procedure ......................3 Amplifier Operation ........................12 3.1 Front-Panel Controls & Display ...................12 3.2 Front-Panel Indicators ......................13... - Page 8 Figure 5.7 – Remote Monitoring of Temperature ........................27 Figure 5.8 – Blanking Activation .............................27 Figure 5.9 – Input to Output Comparison, Controlled-Voltage Operation ................28 Figure 5.10 – Input to Output Comparison, Controlled-Current Operation ................28 Figure 5.11 – Factory-installed Default RC Network ......................29 Figure 5.12 – Custom Compensation Component Locations ....................31 Figure 5.13 – Compensation Effects on Waveform ........................32 Figure 5.14 – Square Wave Showing a Decrease in R is Required ..................32 Figure 5.15 – Square Wave Showing an Increase in R is Required ..................32 Figure 5.16 – Square Wave Showing an Increase in C is Required ..................32 Figure 5.17 – Typical Output Levels for 7548, 7794, 7796 & 7796HC Multiamp Systems .............33 Figure 5.18 – DIP Switch Settings for Push/Pull Configuration ....................34 Figure 5.19 – System Configuration for Push-Pull Multi-amp Operation ................35 Figure 5.20 – DIP Switch Settings for Parallel Configuration ....................37 Figure 5.22 – Locations for Balancing Controls on the Main Board ..................38 Figure 5.21 – Terminating the Amplifier Input .........................38 Figure 5.23– Parallel Balanced Input Wiring Using Removable Barrier Block Connectors (Four in Parallel Shown) ....39 Figure 5.24– Parallel Unbalanced Input Wiring Using BNC Wiring and Connectors (Three in Parallel Shown) ....39 Figure 5.25 – System Configuration for Parallell Multi-amp Operation ..................41 Figure 5.26 – DIP Switch Settings for Series Configuration ....................42 Figure 5.27 – SIM-BNC-OPTOC jumper locations .........................42...
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Page 9: Introduction
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 1 Figure 1.1 – 7548 Front Panel 1 Introduction Congratulations on your purchase of the 7548, can be created to provide additional features 7794, 7796 or 7796HC AE Techron power amplifi- for unique applications. er—a single -channel industrial amplifier designed • Built-in protection circuitry safely provides for for use in the most demanding high-power sys- sustained, full-power output. Full protection tems. The 7548, 7794, 7796 and 7796HC ampli- includes: fiers are built and tested to the most stringent Over-Voltage • quality standards for long life and outstanding Over-Temperature • performance. The AE Techron brand is known • Temperature monitor of heat-sinks, trans- throughout the world for its robust precision ampli- formers and output transistors fiers as well as its product service and support. -
Page 10: Amplifier Unpacking And Installation
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 2 2 Amplifier Unpacking and Along with any additional accessories purchased by the customer, all 7548/7794/7796/7796HC Installation amplifiers ship with the following: The 7548, 7794, 7796 and 7796HC amplifiers are Toolkit (contains one 1/8-inch Allen driver and • precision instruments that can be dangerous if not three 2.7-ohm resistors) handled properly. Lethal voltages are present in both NEMA connector for Power Cord • the AC input supply and the output of these ampli- Operator’s Manual USB drive and Quick Start • fiers. For this reason, safety should be your primary sheet concern when you setup and operate this amplifier. WARNING 2.1 Safety First Throughout this manual special emphasis is Never attempt to lift the amplifier with- placed on good safety practices. The following ... -
Page 11: Connecting The Load
NOT be removed. WARNING: Removing this re- Output potentials can be lethal. Make sistor can cause dangerous output and/or damage connections only with AC Power OFF and input signals removed. to the load unless configuring multiple amplifiers in series. See the AE Techron Multi-Amplifier Con- 2.4 Connecting the Load figuration Guide for more information on these Before connecting the amplifier, make sure the AC advanced configurations. power cord is unplugged. ... -
Page 12: Connecting The Outputs
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 2 2.4.1 Connecting the Outputs The four-position terminal barrier block accepts up to #4 AWG wire. Always use the appropriate wire size and insulation for the maximum current and voltage expected at the output. Never connect the output of the amplifier to any other model amplifier, power supply, signal source, or other inappropriate Figure 2.3 – Close-up of SIM card load; fire can result. on the amplifier back panel (see Figure 2.3). The 1. Connect the negative terminal of the load to standard SIM card includes both an Unbalanced the SAMPLED COMMON terminal. Input BNC jack and a Balanced Input “WECO” ter- NOTE: Alternately, the COMMON terminal minal block connector, an Input Select switch, and may be used when operating in Controlled- an Interlock – I/O Connector. See the Applica- Voltage mode; however, the integrated tions section for information on using the Interlock current monitor will not function if the COM- – I/O Connector. MON terminal is used, since it depends on feedback from the Sampled Common ter- Position the Input Select switch to the left to select the Unbalanced Input connector and to the ... -
Page 13: Connecting The Ac Supply
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 2 Connect your input signal to the amplifier’s unbal- The amplifier includes a NEMA style locking AC connector as standard equipment. Connect the anced or balanced input connector as shown in amplifier to the proper 3-phase AC mains with this Figure 2.4. Use cables that are high quality and shielded to minimize noise and to guard against connector. See Figures 2.5 and 2.6 for proper AC possible feedback. Mains wiring. The connector then plugs into the amplifier. 2.7 Start-up Procedure DANGER 1. Turn down the level of your signal source. 2. Check to make sure the AC Mains Switch/ The risk of lethal ELECTRICAL SHOCK Circuit Breaker is in the off position exists when connecting AC mains! Dis- connect the source before connecting (DOWN). -
Page 14: Amplifier Operation
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 3 3 Amplifier Operation Stop – For stand-alone amplifiers, Stop will place 3.1 Front-Panel Controls & Display the amplifier in Stop mode (both Standby and Stop This section provides an overview of Front- LEDs will be lit). When the amplifier is part of a Panel controls and display screen found on the 7548/7794/7796/7796HC amplifier. Please refer to multi-amp system, pressing the Stop button on any amplifier in the system will place that amplifier in Figure 3.1 for item locations. Stop mode and all other amplifiers in the system 3.1.1 Input Buttons in Standby mode. When an amplifier is in Stop or ... -
Page 15: Multi-Function Lcd Display
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 3 3.1.2 Multi-Function LCD Display The multi-function LCD display provides vari- ous displays of peak and RMS values for voltage and current measured directly from the amplifier output. The amplifier’s model name is displayed on the model display screen in the display rotation. If the amplifier experiences a fault condition, the LCD display will automatically change to display details of the fault condition and prescribed correc- Figure 3.2 – Front Panel Indicators tive actions. NOTE: The Enter button has been provided for On startup, the LCD Display will provide readings future expansion and has no function at this time. for all four measurements: Volts peak, Volts RMS, Current peak, and Current RMS. Use the Naviga- 3.2 Front-Panel Indicators tion buttons to scoll to other available displays, This section provides an overview of Front-Panel indi- such as model name, peak voltage and peak ... -
Page 16: Figure 3.4 - Fault Status Indicators For Stand-Alone Amplifiers
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 3 a fault condition occurs. Depending on the fault 3.3 details the operational modes indicated by the condition and the configuration of the unit, the Main Status indicators. amplifier may be placed in Standby mode when a 3.2.2 Fault Status Indicator fault condition occurs. Refer to the chart in Figure The Fault Status indicator is located on the ampli- 3.4 to determine the fault condition being indicated fier front panel. This LED monitors the internal and the action required to clear the fault condition. conditions of the amplifier and will illuminate when Figure 3.4 – Fault Status Indicators for Stand-Alone Amplifiers Indicator may be lit... -
Page 17: Figure 3.5 - Main Status Indicators For Multi-Amplifier Systems
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 3 3.2.3 Main Status Indicators for along with the statuses of other amplifiers in the Multi-amplifier Systems system, the Main Status indicators can be used The Main Status indicators on each amplifier in to determine the system status and the action required to return the system to Run mode. See a multi-amp system are used to determine the operational status of the amplifier. When evaluated Figure 3.5. Figure 3.5 – Main Status Indicators for Multi-Amplifier Systems Indicator may be lit... -
Page 18: Figure 3.6 - Fault Status Indicators For Multi-Amplifier Systems
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 3 playing the Fault status. Refer to the chart below to the action required to clear the fault condition and determine the fault condition being indicated and return the system to Run mode. Figure 3.6 – Fault Status Indicators for Multi-Amplifier Systems Indicator may be lit Indicator is lit Indicator is not lit One or More Amps in System Main Status Fault Status Indicators of Action Needed to Clear... -
Page 19: Back-Panel Controls And Connectors
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 3 One or More Amps in System Main Status Fault Status Indicators of Action Needed to Clear Main Status Reported on Other Amps Fault Condition and Re- Indicators LCD Display in System State of Operation turn to Run Mode Overvoltage status: This To clear an Overvoltage fault ... -
Page 20: Advanced Configuration
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 4 4 Advanced Configuration If you need to make changes to your amplifier’s configuration, please follow the instructions con- The 7548/7794/7796/7796HC amplifier was de- tained in this chapter for accessing the main board signed to offer exceptional power and versatility in DIP switches and jumpers, and the power supply operation. You can choose from a range of field- board settings.. configurable options, including: The main and power supply boards can be ac- Operate as a stand-alone amplifier or as part of • cessed by removing the amplifier front panel. To a multiple-amplifier system. remove the amplifier front panel, complete the • Select DC-coupled or AC-coupled operation. steps detailed in the following section. Select Controlled-Current or Controlled-Voltage • modes of operation. -
Page 21: Figure 4.1 - Main Board Configuration Locations
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 4 Figure 4.1 – Main Board Configuration Locations Figure 4.2 – DIP Switch Settings and Descriptions board. Most configuration settings can be made nal. When this switch is in the DOWN position, the using these DIP switches. amplifier will operate in Controlled-Current mode, and the amplifier’s output current will be controlled Please refer to Figure 4.1 for main board DIP by its input voltage signal. switch locations. See Figure 4.2 for DIP switch IMPORTANT: Controlled-Current operation re- settings and descriptions. quires the use of a compensation network, and the SW#1: Operation (CV/CC) amplifier’s default compensation network may not be suitable for your application. For more informa- When the Operation DIP switch is in the UP posi- tion (default), the amplifier will operate in Con- tion on Controlled-Current operation, including how trolled-Voltage mode, and the amplifier’s output to determine and configure a custom compensa- voltage will be controlled by its input voltage sig- tion network, see the Applications section. - Page 22 3. Never leave the load open. If you feel the load must be operate in parallel without the use of separate fused, which could lead to a potential open circuit, please contact AE Techron Technical Support. ballast resistors in multi-amp applications up to 20 4. Make sure the load has some inductive component.
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Page 23: Configuration Settings Controlled By Jumpers
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 4 4.4 Configuration Settings Controlled Standby on Overload The 7548/7794/7796/7796HC’s IOC (Input/Output by Jumpers Comparator) Distortion Alert circuit continuously The following settings can be made via jumper compares the waveforms observed at the ampli- settings on the Main Board. Please refer to Figure fier input and output. When a distortion between 4.1 for main board jumper locations. the two waveforms of more than 0.5% occurs, the Custom Compensation Network IOC circuit will activate, and the Overload LED will When the 7548/7794/7796/7796HC amplifier is light, but the amplifier will continue to operate. To used in Controlled-Current mode, the current con- configure the amplifier to move to Standby (Fault ... -
Page 24: Figure 4.5 - Bi-Level Power Switch Location
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 4 1. Turn the power to the amplifier “OFF”. 2. Remove the four hex-head screws, located along the left and right edges of the amplifier front panel using a Torx T15 driver. 3. Remove the front cover by pulling straight towards you. 4. Locate the Bi-level Power Supply Switch as shown in Figure 4.5. 5. Adjust the switch setting based on your op- erating requirements, as described below: AUTO (left position) – power supply will switch • Figure 4.5 – Bi-Level Power Switch Location depending on voltage requirements (factory- default setting). LOCKED LOW (center position) – power sup- •... -
Page 25: Applications
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 5 Applications AE Techron 7548, 7794, 7796 and 7796HC ampli- 5.1 Remote Status and Control using fiers come with a SIM-BNC input module that also the SIM Interlock I/O Connector contains a female, 25-pin D-Sub connector. This The procedures outlined in this section assume connector can be used to provide remote control competence on the part of the reader in terms of and monitoring of the amplifier. amplifier systems, electronic components, and good electronic safety and working practices. The information provided here will instruct you in the wiring of several control and status applica-... -
Page 26: Figure 5.3 - Remote Status And Reset Schematic
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 5.1.2 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 5.3 sche- create a circuit to monitor remotely one or more matic details the circuit and components required amplifier conditions, including Run status, Over- temperature, Overload and Overvoltage. The cir- for all status and reset functions. cuit can also be constructed to allow remote reset of the amplifier when it is forced to Standby due to Overload conditions. Figure 5.3 – Remote Status and Reset Schematic Remote Signal of Over Temperature Condition Note: When amp is normal, this pin is pulled to Purpose: LED, when lit, signals Over Temperature ... -
Page 27: Figure 5.4 - Remote Enable/Standby
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 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... -
Page 28: Figure 5.5 - Remote Current Monitoring
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 When Interlock (PIN 4) is shorted to Digital Ground IMPORTANT: The amplifier must be configured for (PIN 17), the amplifier is placed in Standby mode. Ready mode at startup (factory default) or the Run When switch is open, the amplifier is released to button must be pressed at the amplifier front panel at startup. The Remote Enable/Standby circuit will the 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 5.1.4 Remote Monitoring of Current Using the SIM-BNC Interlock connector located on the back panel of the amplifier, you can remotely monitor current output. -
Page 29: Figure 5.7- Remote Monitoring Of Temperature
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 5.3.7 Remote Monitoring of Temperature 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 tempera- ture 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 5.7. 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 ... -
Page 30: Controlled Current Operation
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 5.2 Controlled Current Operation age. If the load’s impedance changes, the amplifier The procedures outlined in this section assume will seek to maintain this transconductance (ratio competence on the part of the reader in terms of amplifier systems, electronic components, and of input voltage to output current) by increasing or good electronic safety and working practices. decreasing the voltage it produces, as long as it is within the amplifier’s ability to create the required 5.2.1 Controlled-Voltage vs. Controlled- voltage. Use this mode if you want the output cur- Current Modes of Operation rent waveform to be like the input waveform (see AE Techron 7548, 7794 and 7796 amplifiers ... -
Page 31: Figure 5.11 - Factory-Installed Default Rc Network
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 (CV) or Controlled Current (CC) mode of opera- resistive values of the load will determine the required compensation values. While the factory- tion. When operating the amplifier in Controlled default compensation setting will be sufficient Voltage (CV) mode, compensation is not required. for some applications, the compensation setting However, when operating in Controlled Current may also be adjusted in the field. The following (CC) mode, the amplifier load becomes an inte- section describes methods for determining and gral part of the system. In order to ensure sys- setting proper compensation when operating in tem stability and to control available bandwidth, compensation via an RC network is required for Controlled-Current mode. CC operation. The following steps will allow you 5.2.3 Controlling Compensation for to compensate your amplifier for operation in CC CC Operation mode safely and effectively. AE Techron 7548/7794/7796/7796HC amplifiers can be configured for either Controlled Voltage STEP 1: Check Amplifier Operation in CV mode. - Page 32 7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 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 compensation. If, after calculating your required default compensation provided by the amplifier’s compensation, you determine that the default com- factory-installed RC network.
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Page 33: Tool Required
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 Procedure WARNING 1. Turn the power to the amplifier “OFF”. 2. Remove the four hex-head screws, located Do not attempt to access the Main Board along the left and right edges of the amplifier while the amplifier is running. Turn the amplifier off and disconnect the AC front panel using a Torx T15 driver. Mains before removing the amplifier 3. Remove the front cover by pulling straight front panel. towards you. -
Page 34: Figure 5.13 - Compensation Effects On Waveform
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 STEP 7: Optimizing the Compensation Values should increase resistance (see Figure 5.15). 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. After installing the components, check to ensure that the Operation DIP switch (SW#1) is set to Current mode, then power up the amplifier without Figure 5.15 – Square Wave Showing an signal input. Increase in R is Required If the output current waveform is neither under- To begin testing, input a square wave with a fre-... -
Page 35: Multi-Amplifier Systems
Use only AE Techron amplifers of the same version 7548/7794/7796/7796HC amplifiers may be con- to construct a multiamp system. Do not combine figured in parallel for up to four times the continu- different versions or models of AE Techron ampli- fiers in the same system or use amplifiers made by ous current output. See Figure 5.17 for the ap- proximate output levels you can expect from each another manufacturer in an AE Techron multiamp system. Such improper connections could damage multi-amp system. the amplifiers. While it is possible to operate a multi-amp system Use Correct Wiring in either Controlled Voltage or Controlled Current Never directly connect one amplifier’s OUTPUT modes of operation, multi-amp operation in Con- terminal to another amplifier’s OUTPUT terminal. ... -
Page 36: Accessories Required
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 one amplifier should only be directly connected to WARNING the next amplifier’s COM terminal or to the load. Operate with Safety in Mind Do not attempt to access the Main Board while the amplifier is running. Turn the Potentially lethal voltages and currents are present amplifier off and disconnect the AC within the amplifiers. While the amplifiers’ chas- Mains before removing the amplifier front panel. sis are earth-grounded, all internal grounds are floating. -
Page 37: Optional Dip Switch Settings
WECO DIP SWITCH SETTINGS: 1 2 3 4 5 6 7 8 SYSTEM REQUIREMENTS: KEY FOR DIP SWITCH (2) 7548 Amplifiers or SETTINGS: (2) 7794 Amplifiers or REQUIRED (2) 7796 Amplifiers or DEFAULT (2) 7796HC Amplifiers 3110A or other OPTIONAL... -
Page 38: Amplifier Wiring
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 Two cables to connect from the amplifier’s OUT- connect from the Master amplifier’s back-panel PUT connectors to the load, and one cable to SAMPLED COMMON connector to the Follow- connect (bridge) the two amplifier’s COM output er amplifier’s back-panel SAMPLED COMMON connectors. connector. 11. Using wiring appropriate for your application WARNING and your load, connect from the Master and Follower amplifiers’ OUTPUT connectors to the ELECTRIC SHOCK HAZARD. load. Output potentials can be lethal. Make 12. Power up your system and confirm the expect- connections only with AC Power OFF and input signals removed. ed system output. 5.3.3 Configuration and Wiring for Paral-... -
Page 39: Figure 5.20 - Dip Switch Settings For Parallel Configuration
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 Optional DIP Switch Settings the amplifier front panel. See Figure 4.1 for DIP DIP switches 3, 4 and 8 control amplifier functions switches location on the main board. that can be optionally enabled for use during multi- WARNING amp operation. Be sure to configure any optional settings the same for all amplifiers in the system. Do not attempt to access the Main Board SW#3 - Low-Pass Filter (50 kHz): Set DIP switch while the amplifier is running. Turn the amplifier off and disconnect the AC #3 on all amplifiers in the DOWN position to en-... -
Page 40: Verify Interlock Operation
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 the INTERLOCK – I/O CONNECTOR on the SIM-BNC input card of additional amplifiers in your system. 3. Ensure that the inputs of all of the amplifiers are terminated by using a resistor-terminated barrier block connector (see Figure 5.21) or similar device. Verify Interlock Operation Figure 5.21 – Terminating the Amplifier Input 1. Power up each amplifier by switching to ON Adjust DC Offset the back-panel AC Mains Switch/Circuit Break- 1. Power down all amplifiers. On each amplifier er to the ON (up) position. Allow each amplifier main board, locate the Offset Adjust potenti- to power up and come to Ready state. When ometer (see Figure 5.22). Ready, the amplifier Ready and Run LEDs will ... -
Page 41: Verify And Adjust Amplifier Gain
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 connector terminals (OUTPUT to SAMPLED COMMON) to verify that the DC offset of each amplifier is less than 5 mVdc. 5. If the DC offset for any amplifier is greater than 5 mVdc, adjust each amplifier using the Offset Adjust potentiometer on the amplifier main board. Adjust each amplifier’s DC offset to read as closely as possible to zero Input Wiring 1. Power down the amplifiers. 2. Remove all amplifier input terminations. Figure 5.23– Parallel Balanced Input Wiring 3. Use the wires included in the Parallel Wiring Kit Using Removable Barrier Block Connectors and the Removable Barrier Block connectors (Four in Parallel Shown) that ship with each amplifier to create a paral- leled input signal wire as shown in Figure 5.23. Wire one input connector for each amplifier in your system. You can use balanced wiring (shown), or you can build the wire for unbal- anced 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). 4. Alternately, you can connect an unbalanced input signal to the SIM-BNC’s BNC input con- nector using the BNC parallel input wiring as shown in Figure 5.24. Set the INPUT SELECT ... -
Page 42: Verify Minimal Circulating Currents
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 the first amplifier and any additional amplifiers amplifiers (Amplifier #1 OUTPUT to Amplifier #2 OUTPUT). Verify a meter reading of less in your system. 4. Continue checking and adjusting until the gain than 200 mV, up to the typical power level for of all amplifiers in the system is matching to the application. (200 mV corresponds to 2A of circulating current.) Check additional amplifiers within millivolts. in your system. WARNING 6. Continue to monitor the DVM readings while turning signal input level up to the level re- ELECTRIC SHOCK HAZARD. quired for your application. Output potentials can be lethal. Make 5.3.4 Configuration and Wiring for Se-... -
Page 43: Parallel Configuration
WECO DIP SWITCH SETTINGS: 1 2 3 4 5 6 7 8 SYSTEM REQUIREMENTS: (2 to 4) 7548 Amplifiers or (2 to 4) 7794 Amplifiers or 3110A or other KEY FOR DIP SWITCH (2 to 4) 7796 Amplifiers or SETTINGS:... -
Page 44: Figure 5.26 - Dip Switch Settings For Series Configuration
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 Required DIP Switch Settings SW#8 - DC/AC Coupling: Set DIP switch #8 on DIP switch settings required for Series operation the Master amplifier in the DOWN position to block in Figure 5.26. Configure these DC signals. are shown in back-panel DIP switches for the Master and all Configure SIM-BNC-OPTOC cards Follower amplifiers. Each amplifier in a 7548/7794/7796/7796HC Series multi-amp system uses a specialized input card (SIM-BNC-OPTOC)that helps to synchronize the operation of all amps in the system and pro- vides for optical isolation. -
Page 45: Figure 5.28 - Sim-Bnc-Optoc Input Connectors' Internal Wiring
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 2. Use a #2 Phillips screwdriver to remove and retain the two (2) screws located at the edges of the input card. 3. Unplug the ribbon cable from the back of the input card; remove the card from the amplifier card bay. 4. For each amplifier, plug the ribbon cable into the ribbon connector on the SIM-BNC-OPTOC Figure 5.28 – SIM-BNC-OPTOC input connectors’ card. Reinstall the card into the card bay on the internal wiring amplifier back panel and secure in place using the retained screws. as Followers. Place a label reading “Master” or Remove 2.7-ohm Resistors from Follower “Follower” on the front of each input card to clarify Outputs the function of each card. -
Page 46: Figure 5.30 - System Configuration For Two In Series Multi-Amp Operation
1 2 3 4 5 6 7 8 CHASSIS GROUND SYSTEM REQUIREMENTS: KEY FOR DIP SWITCH (2) 7548 Amplifiers or SETTINGS: (2) 7794 Amplifiers or (2) 7796 Amplifiers or REQUIRED (2) 7796HC Amplifiers DEFAULT 3110A or other (2) SIM-BNC-OPTOC Cards (69-1875020) -
Page 47: Figure 5.31 - System Configuration For Three In Series Multi-Amp Operation
1 2 3 4 5 6 7 8 CHASSIS GROUND SYSTEM REQUIREMENTS: KEY FOR DIP SWITCH (3) 7548 Amplifiers or WECO SETTINGS: (3) 7794 Amplifiers or (3) 7796 Amplifiers or REQUIRED (3) 7796HC Amplifiers DEFAULT 3110A or other (3) SIM-OPTOC Cards (69-1875020) OPTIONAL... - Page 48 7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 Stop – Pressing the Stop button on any amplifier Enable – In multi-amp systems that have been configured to start up in Run mode (factory de- in the system will place that amplifier in Standby/ Stop mode and place all other amplifiers in the fault setting), when an amplifier is powered on, system in Remote Standby mode. the amplifier will be placed in Remote Standby mode (Ready and Standby LEDs lit) and remain Reset – Pressing the Reset button on the ampli- in Remote Standby mode until all amplifiers in the fier reporting a fault condition will return all of the system have been powered on. The system will amplifiers to Run mode if the condition causing the automatically proceed to Run mode when all am- fault condition has been cleared and the ampli- plifiers in the system are powered on and achieve fier has been configured for startup in Run mode. Remote Standby mode. However, pressing the Reset button on other am- plifiers in the system (not reporting a fault condi- In multi-amp systems that have been configured to tion) will NOT clear the fault condition. Refer to the start up in Stop mode, when an amplifier is pow- “Fault Status Indicators” section for information ered on, the amplifier will be placed in Standby/...
- Page 49 7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 Main Status Indicators for Multi-amplifier Systems The Main Status indicators on each amplifier in system, the Main Status indicators can be used a multi-amp system are used to determine the to determine the system status and the action operational status of the amplifier. When evaluated required to return the system to Run mode. See along with the statuses of other amplifiers in the Figure 5.32. Figure 5.32 – Main Status Indicators for Multi-Amplifier Systems Indicator may be lit...
- Page 50 7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 Fault Status Indicators for Multi-Amp Systems dition and the configuration of the system. Typi- The four Fault Status indicators located on each cally, the system can be released from Standby amplifier’s front panel are used to monitor the in- mode by pressing the Reset button on the amplifi- ternal conditions of the amplifier and will illuminate er displaying the Fault status. Refer to the chart in when a fault condition occurs. All amplifiers in the system may be placed in Standby mode when a Figure 5.33 to determine the fault condition being indicated and the action required to clear the fault fault condition occurs, depending on the fault con- condition and return the system to Run mode. Figure 5.33 – Fault Status Indicators for Multi-Amplifier Systems Indicator may be lit...
- Page 51 7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 5 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 52: Maintenance
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 6 6.1 Clean Amplifier Filter and Grills 6 Maintenance 6.1.1 Tools Required Simple maintenance can be performed by the The recommended equipment and supplies user to help keep the equipment operational. needed to perform the functions required for this The following routine maintenance is designed task are described below. to prevent problems before they occur. See the Troubleshooting section for recommendations for Torx T15 driver • restoring the equipment to operation after an error • Vacuum cleaner condition has occurred. Damp cloth (use water only or a mild soap • diluted in water) Preventative maintenance is recommended after To ensure adequate cooling and maximum ef-... -
Page 53: Troubleshooting
Inspect the entire lengths of wires and ribbon • Main board undergoes periodic engineering modifi- cables for breaks or other physical damage. cations that may make interchangeability between 6. If there is any physical damage to the amplifier, units impossible. please return it to AE Techron for repair. 7.3 No Signal CAUTION Missing Output signal may be caused by one of the following: Before you begin, make sure your ampli- fier is disconnected from the power 1. Master/Follower Jumpers are set to the Follower source, with power switch in the OFF position and the level control turned (down) position. The amplifier should only be ... -
Page 54: Overvoltage Warning Message
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 7 Figure 7.2 – Fuse F1 Location 2. Back Panel Breaker is not in the UP position. eration, see the Applications section in this 3. Fuse F1 is open. manual. 3. If the connection to the Interlock – I/O Connec- To Inspect Fuse F1 follow these steps: tor or other input/output connection isn’t fully 1. Turn Off the amplifier and disconnect the AC secure. Check all wiring and connections. mains. 7.7 Amplifier Overheats (Over Temp 2. Locate Fuse Cover on the amplifier back panel Fault Condition) (see Figure 7.2). Remove Fuse Cover. 3. Remove fuse and inspect. Replace, if neces- There are two possible reasons why the amplifier ... -
Page 55: Fault Led Is Illuminated
Try resetting the Fault equate airflow, proceed with the following steps: condition only once. If the Fault condi- tion does not clear after one reset, STOP. Contact AE Techron Support for further 1. Check air filters. Over time they can become assistance. Repeated resetting can dam- dirty and worn out. It is a good idea to clean age the amplifier. -
Page 56: Appendix A: Interlock I/O Connector Pinouts And Functions
0V (not ready) to -15V (ready), with an OPTOC BNC card the signal will go from 0V (not ready) to -1.2Vdc (ready) I MON + Differential Current Output current produced per voltage Current Monitoring: Connect a voltage meter to AC or 7212, 7224, Monitor + 7224RLY, 7234: monitor the output current being produced by the detect. 5A/V amplifier. For unbalanced, for each 1V detected, cur- rent output is 5A (7212/7224/7224RLY/7234) or 20A 7548, 7548RLY, (7548/7548RLY/7794/7796/7796RLY/7796HC). 7794, 7796, 7796RLY, 7796HC: 20A/V None No connection Currently not used. - Page 57 Pin # Function Description Signal Level when Level when Notes Applications Type Asserted Deasserted Blanking Input Blanking control The blanking circuit shuts down the Blanking (Customer Mute): Build a switchable cir- 0Vdc 5-6 Vdc (Customer Mute) amplifier output stage in less than cuit using an external, isolated 5V power supply that 10 µs. can apply a +5V signal to PIN 8. Connect across PIN 8 (Blanking) and PIN 18 (Blanking Return). Temperature Monitoring: Connect a voltage meter Temperature Mon- (VDC * 100) – This circuit has a 1K build-out resis- Temperature 3.5 - 5Vdc Monitor 273 = degrees ...
- Page 58 AC or 7212, 7224, (alt.: OEM Monitor – ; 7224RLY, 7234: current produced per voltage detect. to monitor the output current being produced App) (- Input Monitor, 5A/V by the amplifier. For each 1V detected, current OEM only) output is 5A (7212/7224/7224RLY/7234) or 20A 7548, 7548RLY, (7548/7548RLY/7794/7796/7796RLY/7796HC). 7794, 7796, 7796RLY, 7796HC: 20A/V 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.
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