Related Manuals for Positron 7885-2
Summary of Contents for Positron 7885-2
- Page 1 Standalone Power Supply Unit 120 V ac to 48 V dc, 7885-2 & 7885-3 Description and Installation...
- Page 2 The information contained in this document is the property of Positron Inc. Except as specifically authorized in writing by Positron Inc., the holder of this document: 1) shall keep all information contained herein confidential and shall protect same in whole or in part from the disclosure and dissemination to all third parties, and 2) shall use same for operating and maintenance purposes only.
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Page 3: Table Of Contents
Contents The Standalone Power Supply Unit and Battery Unit ........1 Hardware Description . -
Page 5: The Standalone Power Supply Unit And Battery Unit
They are always sold together, as a pair. The Standalone Power Supply Unit, model 7885-2, converts 120 V ac, 60 Hz to 48 V dc, and may be configured for an output that is either floating or referenced to station ground. - Page 6 7885-2 & 7885-3 Standalone Power Supply Unit 120 V dc to -24 V dc Figure 1 Models 7885-2 & 3 7885-2 FRONT VIEW 16-1/4" BATTERY 50BC 1;> 3-7/8" TEST $0<? CHARGE POWER POSITRON # 7885-2 MOUNTING TRAY 7885-2 RIGHT SIDE VIEW 9-2/3"...
- Page 7 AC to DC conversion. • When model 7885-2 and 7885-3 are connected together, they provide 5.7 ampere-hours of charge at 48 V dc. The batteries are kept charged by the power supply while it is operating from the AC source.
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Page 8: Hardware Description
7885-2 & 7885-3 Standalone Power Supply Unit 120 V dc to -24 V dc Hardware Description For the block diagram of model 7885-2, refer to Figure 2. Figure 2 Block Diagram 120 V ac in Input Batteries Filter Breaker Under... - Page 9 The following is a description of the elements of the Standalone Power Supply Unit block diagram. Input Breaker The Input Breaker circuit on the right side panel of the 7885-2 is a 1 A circuit breaker providing standard input protection. Transformer The Transformer provides 1500 V isolation while stepping down the voltage for the regulator.
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Page 10: Technical Specifications
7885-2 & 7885-3 Standalone Power Supply Unit 120 V dc to -24 V dc Technical Specifications For a listing of the unit’s electrical specifications, refer to Table 1. For a listing of the unit’s physical specifications, refer to Table 2. -
Page 11: Installation
Verify that you are not using any equipment which is incompatible with the Standalone Power Supply Unit. For lists of equipment that are compatible with the unit, models 7885-2 & 3, refer to Table 3 and Table 4. All other equipment is not compatible with this unit. - Page 12 7885-2 & 7885-3 Standalone Power Supply Unit 120 V dc to -24 V dc Table 3 Case 1: List of Compatible Equipment Supply Configured for Floating 48 V dc (i.e., Connected Between -48V and RU GEN) Plug-in Two-wire AC Data Card...
- Page 13 7885-2 & 7885-3 Standalone Power Supply Unit 120 V dc to -24 V dc Table 4 Case 2: List of Compatible Equipment Supply Configured for -48 V dc w.r.t. Station Ground (i.e., Connected Between -48 V and Ground) Two-wire T1 Carrier Card...
- Page 14 7885-2 & 7885-3 Standalone Power Supply Unit 120 V dc to -24 V dc Table 5 Model 7885-2 & 3 Kit Contents Items Included Part Number Standalone Power Supply Unit 244-040028-401 Description and Installation document 7885-24-02 Battery backup case assembly...
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Page 15: Mechanical Installation
Confirm that the unit is a Standalone Power Supply Unit by identifying the model number of the power supply and of the battery unit on their respective faceplates. Model 7885-2 is shipped with one lead of the battery pack disconnected, and therefore requires installation first. ? Open the power supply enclosure. -
Page 16: Teleline Shelf Mount
Standalone Power Supply Unit 120 V dc to -24 V dc Place model 7885-2 on top of the tray and align the holes on the left side of the power supply enclosure with those on the left side of the mounting tray. -
Page 17: Electrical Installation
Connect the Standalone Power Supply Unit, model 7885-2 to the Battery unit, model 7885-3, with the cable provided. The cable mates to connectors on the rear of each unit. - Page 18 Standalone Power Supply Unit 120 V dc to -24 V dc Connect the terminated end of the output power cable to the mating connector on the right side of the Standalone Power Supply Unit (7885-2). Ensure that there are no excess wires dangling into the isolation gap between the Station and CO side circuits.
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Page 19: Battery Replacement Procedure
12V, 5.7 A-h. P/N PE12V7F1 unit or equivalent. For a view of the Power Supply Unit’s component layout, refer to Figure 4. To replace the battery for models 7885-2 and 7885-3 Disconnect the power supply from the shelf. Remove the metal enclosure by loosening the two faceplate screws and sliding the chassis out. - Page 20 7885-2 & 7885-3 Standalone Power Supply Unit 120 V dc to -24 V dc Figure 4 7885-2 & 3 Component Layout 7885-2 COMPONENT LAYOUT (TOP VIEW) HEAT SINK INPUT FUSE BATTERY BATTERY 12 V DC 12 V DC FILTER CAPACITOR...
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Page 21: Service And Support
Arrangements and pricing information regarding field assistance may be obtained by contacting the Technical Customer Support department. Please contact Positron for scheduling at least four weeks prior to the actual requested visit date. Customer Training Positron offers full customer training courses, as requested. - Page 22 Positron Inc. offers repair services by which customers can count on timely and quality repairs, regardless of customer location. All warranty repairs are performed at no cost. Positron reserves the right to repair or replace any equipment which has been found to be defective.
- Page 23 Standalone Power Supply Unit 120 V dc to -24 V dc Ordering Information Positron’s Teleline equipment can be ordered by telephone, facsimile, or by mail. All orders should be directed to the Positron Inside Sales department. Ordering by telephone, or facsimile will eliminate any delays arising from postal services.
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