PARALLEL MULTI-AMP KIT for 7200 Series AMPLIFIERS INSTRUCTION SHEET

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1 W a r r e n S t r e e t, E l k h a r t, I N U S A w w w. A E T e c h r o n. c o m PARALLEL MULTI-AMP KIT for 7200 Series AMPLIFIERS INSTRUCTION SHEET Kit Contents: see Figure 1 (1) Parallel Interconnect Box (2) SIM-BNC-OPTOC input cards (1) DB-9 cable (2) jumpers to enable fixed gain Important This Instruction Sheet explains how to use your Parallel Multi-amp Kit to configure and setup previously purchased 7200-Series amplifiers. If you received this kit along with factoryconfigured and tuned amplifiers, refer to Section 4 for quick wiring instructions. Safety First Throughout these instructions special emphasis is placed on good safety practices. The WARNING and CAUTION graphics are used to highlight certain topics that require extra precaution. 1 Install SIM-BNC-OPTOC Input Cards Before installing the SIM-BNC-OPTOC input cards in the amplifiers, make sure the amplifier s AC power cord is unplugged and the input level controls are turned fully down. Figure 1 Parallel Multi-amp Kit for 7200-Series Amplifiers 1 Locate the standard SIM-BNC Input Card on the right side of the rear panel of each amplifier. 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, and remove the card from the amplifier card bay. 4 (Optional) The SIM-BNC-OPTOC input cards contained in the Parallel Multi-amp kit have been factory configured with the ground leg enabled on the Weco Terminal Block input connector, allowing it to receive Balanced Input signal. To configure the SIM-BNC-OPTOC input cards to receive Unbalanced signal on the Weco Terminal Block connectors (ground lifted), set jumper J4 on the SIM-BNC-OPTOC card to CLOSED (see Figure 2). After turning the amplifier off, let the unit sit for 3-5 minutes before removing the input card or access panel. This will allow the electrical charge in the power supply capacitors to discharge. Figure 2 Weco Terminal Strip Input Connector, Balanced/Unbalanced Option

2 7200-Series Parallel Multi-Amp Kit Instructions Page 2 of 7 5 For each amplifier, plug the ribbon cable into the ribbon connector on the SIM-BNC-OPTOC card. Reinstall the card into the card bay on the amplifier back panel and secure in place using the retained screws. 2 Prepare Amplifiers In order to ensure the amplifiers in the parallel system maintain a matched gain while operating, the variable gain controls located on the amplifier front panels must be disabled. Once disabled, each amplifier will have a fixed gain of 20. If preferred, the gain for each amplifier can be fixed at a lower level. To disable the variable gain control, you must access the amplifier main board. The 7224 amplifier contains an Access Panel built into the top cover to allow easy access to the main board. Do not attempt to access the Main Board while the amplifier is running. Turn the amplifier off and disconnect the AC Mains before removing the input card or amplifier access panel. IMPORTANT: Before removing the Access Panel, make sure the amplifier is turned off for at least 3-5 minutes and the AC mains are disconnected. Accessing the Main Board 1. On each amplifier, locate the Access Panel as shown in Figure 3. Make sure that all 8 screws are accessible. Remove the unit from its rack, if necessary. 2. Using a #2 Phillips screwdriver, remove the 8 screws located on the top and side of the amplifier. 3. Remove the Access Panel and set it aside. Disable Variable Gain Control 1 Locate the connector that connects the external gain control to the main board by following the wire leading from the gain control (see Figure 4). 2 Pull gently upward to remove the 3-pin Figure 4 Gain Control Connection on Main Board connector from the main board. Secure the gain-control cable within the amplifier cabinet. Set Fixed Gain 1 To set a fixed gain of 20, place one of the jumpers (supplied) across pins 1 and 2 as shown in Figure 5. 2 If preferred, a fixed gain can be set at another level; place two resistors (not supplied) across pins 1 and 2 (resistor 1) and pins 2 and 3 (resistor 2) as shown in Figure 5. Note: these resistors can be mounted to a header or soldered directly to the pins. Figure 3 Access Panel Screw Locations Figure 5 Gain Control Pin Settings

3 7200-Series Parallel Multi-Amp Kit Instructions Page 3 of 7 3 Parallel System Tuning and Hookup Tuning for Balanced Parallel Operation Before operating a paralleled amplifier system, the system first must be tuned to ensure system stability. The tuning process seeks to calibrate the amplifiers so they operate as similar as possible. To prevent unwanted current and dissipation in the load, each amplifier must have as little offset DC as possible at no signal. In addition, the gains of the amplifiers must be as closely matched as possible to keep the outputs from driving each other when a signal is present. System tuning is required for both Controlled Current and Controlled Voltage modes of operation. IMPORTANT: When operating in Figure 6 Wiring Diagram for Parallel System Tuning Controlled Current mode, both amplifiers must first be compensated as accurately as possible. See the Tech Note Compensating the Amplifier to the Load for CC Operation at _controlled_ current_operation.shtml for more information. Complete the following procedures to tune your parallel amplifier system. Connect for Tuning IMPORTANT: Matching of output cable lengths is critical in a paralleled system. The cables leading from the Interconnect Box to the amplifiers have been constructed to meet critical tolerances. Do not cut the loops or shorten the wires that connect to the amplifier output. Refer to Figure 6 as you follow the steps below. 1 Connect the black wire from one side of the ELECTRIC SHOCK HAZARD. Output potentials from the amplifier can be lethal. Make connections only with amplifier AC power OFF and input signals removed. Interconnect box to one of the amplifier s output connector labeled COM on the amplifier back panel. Connect the black

4 7200-Series Parallel Multi-Amp Kit Instructions Page 4 of 7 wire from the other side of the Interconnect box to the other amplifier s COM connector. Important: Do not connect the white wires or the LOAD at this time. 2 Connect the DB-9 cable from the MASTER OUTPUT connector on the SIM-BNC-OPTOC card of the first amplifier to the SLAVE INPUT connector on the SIM-BNC-OPTOC card of the other amplifier. 3 Ensure that the inputs of the amplifiers are terminated (not connected at this time). Verify Interlock Operation 1 Power up each amplifier by switching to ON the front-panel ON/OFF switch. 2 Allow each amplifier to power up and come to Ready state. When Ready, the amplifier Ready and Run LEDs will be lit. Note: Some amplifiers that have been customconfigured may require that you press the Enable button to bring the amplifier to the Ready state. 3 On the first amplifier only, press the Standby button to place the amplifier in Standby mode. 4 Verify that both amplifiers enter Standby mode (Standby LED is lit). Adjust DC Offset 1 Power down both amplifiers. 2 Access the main boards for each amplifier (if not already open). See Section 2, Prepare Amplifiers, for more information. 3 On each amplifier main board, locate the Amp Offset (R65) (see Figure 7). 4 Power up both amplifiers and run the amplifiers for several minutes in Ready state to allow DC offsets to stabilize. 5 Using a digital voltmeter set to DC, measure across the amplifier s back-panel output connector terminals (OUTPUT to COM) to verify that the DC offset of each amplifier is less than 5 mvdc. 6 If the DC offset for either 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. Amplifier Gain A. Verify and Adjust Amplifier Gain 1 Power down the amplifiers. 2 On the main board of each amplifier, locate the Amp Gain Trim (R210) (see Figure 7). 3 Connect a digital voltmeter set to AC volts between the OUTPUT and COM terminals of the first amplifier. 4 Connect from a signal generator, in parallel, to the amplifier input connectors on both amplifiers. See Figure 8. 5 Power up the first amplifier. 6 Apply a sine wave to the amplifier input of approximately 5Vrms ( Hz). This should result in about 100Vrms output from the amplifier (assuming a fixed gain of 20). 7 If voltmeter indicates an output greater or lesser than 100 Vrms, adjust Amp Gain Trim (R210) to correct. 8 Repeat this procedure for the second amplifier B. Amplifier Gain Matching 1 Connect a digital voltmeter set to AC volts between the positive outputs of the amplifiers. Figure 7 Main Board Tuning Control Locations 2 Adjust Amp Gain Trim (R210) on the second amplifier for minimum AC voltage (millivolts). Verify Minimal Circulating Currents 1 Power down the amplifiers. 2 On each amplifier, connect the white wires from the side of the Interconnect box to the output labeled OUTPUT on the

5 7200-Series Parallel Multi-Amp Kit Instructions Page 5 of 7 amplifier back panel. Note: Do not connect the LOAD at this time. 3 Starting with a signal input approximately 10% of the typical input required for your application (or between 0.5 and 1.0 Vrms), power up the amplifiers. 4 Connect a digital voltmeter set to AC volts between the positive outputs of the amplifiers (OUTPUT to OUTPUT). Verify a meter reading of less than 0.2 mv. 5 Continue to monitor the DVM reading while turning signal input level up to the level required for your application. Verify Current Sharing 1 Power down the amplifiers. 2 Connect your load to the red and black binding post connectors labeled LOAD on the Parallel Interconnect box. Connect the positive terminal of your load to the RED connector; connect the negative terminal of your load to the BLACK connector. 3 Check to ensure that all system wiring has been correctly installed as shown in Figure 8. 4 Staring with a signal input approximately 10% of the typical input required for your application, power up the amplifiers. 5 Connect a digital voltmeter set to AC volts between the positive outputs of the amplifiers (OUTPUT to OUTPUT). Verify a meter reading of less than 200 mv. 6 Continue to monitor the DVM reading while turning signal input level up to the level required for your application. 4 Quick Wiring Instructions If the 7224 amplifiers have previously been prepared and tuned for parallel operation, complete the following steps to hookup your parallel amplifier system: 1 Connect Interlock cable: Connect the DB-9 cable from the MASTER OUTPUT connector on the SIM-BNC-OPTOC card of the first amplifier to the SLAVE INPUT connector on the SIM- BNC-OPTOC card of the other amplifier. Figure 8 Wiring Diagram for Parallel System Operation

6 7200-Series Parallel Multi-Amp Kit Instructions Page 6 of 7 2 Connect 7200-Series Parallel Interconnect Box to amplifiers: Connect the black cable from one side of the Interconnect Box to the output connector labeled COM on one of the 7224 amplifiers. Connect the white cable from the same side of the Interconnect Box to the output connector labeled OUTPUT on the same 7224 amplifier. Repeat these connections with cables from the other side of the Interconnect Box to the output connectors of the other amplifier. 3 Connect the Load: Connect your load to the red and black binding post connectors labeled LOAD on the Parallel Interconnect box. Connect the positive terminal of your load to the RED connector; connect the negative terminal of your load to the BLACK connector. 4 Connect the Inputs: Connect from a signal generator, in parallel, to the amplifier input connectors on both amplifiers. See Figure 8. 5 Single Amplifier Operation Your amplifiers can be operated individually by using standard input and output wiring. See the 7224 Operator s Manual for hookup instructions. To operate individually with front-panel variable gain control, remove the installed jumper from the main board and reattach the external gain control connector. 6 Factory Defaults on SIM-BNC- OPTOC Input Card To return the SIM-BNC-OPTOC input card to the factory default settings, refer to Figure 9. Figure 9 SIM-BNC-OPTOC, Factory Default Settings 7 Factory Service If the unit fails to perform, it may need to be returned for Factory Service. All units under warranty will be serviced free of charge (customer is responsible for one-way shipping charges as well as any custom fees, duties, and/or taxes). Please review the Warranty included with this Instruction Sheet for more information. All service units must be given Return Authorization by AE Techron, Inc. before being returned. Return Authorizations can be requested on our website or by contacting our Customer Service Department. Please take extra care when packaging your unit for repair. It should be returned in its original packaging or a suitable alternative. Replacement packaging materials can be purchased for a nominal fee. Please send all service units to the following address and be sure to include your Return Authorization Number on the box. AE Techron, Inc. Attn: Service Department / RMA# 2507 Warren Street Elkhart, IN 46516

7 7200-Series Parallel Multi-Amp Kit Instructions Page 7 of 7 Limited One-Year Warranty SUMMARY OF WARRANTY AE TECHRON INC., of Elkhart, Indiana (Warrantor) warrants to you, the ORIGINAL COMMERCIAL PURCHASER ONLY of each NEW AE TECHRON INC. product, for a period of one (1) year from the date of purchase, by the original purchaser (warranty period) that the product is free of defects in materials or workmanship and will meet or exceed all advertised specifications for such a product. This warranty does not extend to any subsequent purchaser or user, and automatically terminates upon your sale or other disposition of our product. ITEMS EXCLUDED FROM WARRANTY We are not responsible for product failure caused by misuse, accident or neglect. This warranty does not extend to any product on which the serial number has been defaced, altered, or removed. It does not cover damage to loads or any other products or accessories resulting from AE TECHRON INC. product failure. It does not cover defects or damage caused by the use of unauthorized modifications, accessories, parts, or service. WHAT WE WILL DO We will remedy, at our sole discretion, any defect in materials or workmanship by repair, replacement, or refund. If a refund is elected, you must make the defective or malfunctioning component available to us free and clear of all liens or other encumbrances. The refund will be equal to the actual purchase price, not including interest, insurance, closing costs, and other finance charges less a reasonable depreciation on the product from the date of original purchase. Warranty work can only be performed at our authorized service centers or at our factory. Expenses in remedying the defect will be borne by AE TECHRON INC., including one-way surface freight shipping costs within the United States. (Purchaser must bear the expense of shipping the product between any foreign country and the port of entry in the United States and all taxes, duties, and other customs fees for such foreign shipments.) HOW TO OBTAIN WARRANTY SERVICE When you notify us of your need for warranty service, we will give you an authorization to return the product for service. All components must be shipped in a factory pack or equivalent which, if needed, may be obtained from us for a nominal charge. We will take corrective actions within a reasonable time of the date of receipt of the defective product. If the repairs made by us are not satisfactory, notify us immediately. DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES You are not entitled to recover from us any consequential or incidental damages resulting from any defect in our product. This includes any damage to another product or products resulting from such a defect. WARRANTY ALTERATIONS No person has the authority to enlarge, amend, or modify this warranty. The warranty is not extended by the length of time for which you are deprived of the use of this product. Repairs and replacement parts provided under the terms of this warranty shall carry only the unexpired portion of this warranty. DESIGN CHANGES We reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes in products previously manufactured. LEGAL REMEDIES OF PURCHASER There is no warranty that extends beyond the terms hereof. This written warranty is given in lieu of any oral or implied warranties not contained herein. We disclaim all implied warranties, including, without limitation, any warranties of merchantability or fitness for a particular purpose. No action to enforce this Warranty shall be commenced later than ninety (90) days after expiration of the warranty period. AE TECHRON INC. Customer Service Department 2507 Warren St. Elkhart, IN, 46516, U.S.A. (574)