Current Relays

Models D18S and D18C No. 7
Reprinted:  July 15, 1952

INTERCHANGEABILITY OF REVERSE CURRENT RELAYS
In order to facilitate changing from one type of reverse current relay to another, it will be necessary to make certain wiring changes. Wiring diagrams covering the changes are included in this letter. The Westinghouse and General Electric Installation shown on the wiring diagram is also applicable to the Leese Neville and AN3025-1 types of relays.

On airplanes equipped with Bendix No 688-2 reverse current relays and where a change is made to either Westinghouse, General Electric, Leese Neville, or any make of AN3025-1 relays, wires numbered 630 in the right generator control box and 622 in the left generator control box are removed from their ground connections and connected to the terminals marked GEN. on the reverse current relays. If changing from Westinghouse, General Electric, Leese Neville, or AN3025-1 type relays to Bendix No. 688-2, it will be necessary to remove wires numbered 630 and 622 from the terminals marked GEN. and fasten them to a good ground within the control box. This procedure would be in reverse to that outlined above.

Your airplane may be equipped with any one of the following types of reverse current relays listed below, so a check should be made to determine if changes in wiring are necessary.
Westinghouse    Type AVR-14A    Part No. 1240224A
Westinghouse    Type AVR-14B    Part No. 1171000A
Part No. 7-A-5930-GR-1
General Electric, Part No. 3CTR72A1
Leese Neville, Part No. 24565
Any Make, AN3025-1
Bendix    Type 688-2, To be used on D18S Airplanes only

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