Functioning of Relay Assembly 1A15A18

TM 11-5820-695-35

2-64.1 Functioning of Relay Assembly 1A15A18

Relay assembly 1A15A18 monitors summary alarm

a. Operating voltage (+28 Vdc from 1A15TB3-13)

signals from Transmitter, Radio T-1054(P)A/GRC-

is applied to relays K1, K2 and K3 through 1A15A18E1.

144(V), Receiver, Radio R-1467 (P) A/GRC-144 (V) and

The status of the monitored signals at 1A15A18E2, E5

Converter-Multiplier Assembly CV-3633/GRC-144 (V) .

and Ell then determines whether a relay is energized or

The summary alarm signals are applied to relays

not. The sources of these signals are indicated in the

1A15A18K1, K2 and K3 and output signals from these

figures. Refer to paragraph 2-87 for the signal at

relays are routed to the OCU and to alarm monitor

3A7J2-C in figure 2-35. The chart below lists the three

circuits in orderwire assembly 1A13. Relay 1A18K4

inputs and shows the corresponding status of each relay

monitors status signals from the waveguide switches.

for normal and for fault condition. The relay output

Output signals from K4 are routed to WAVEGUIDE SW

signal are routed to the OCU and to orderwire assembly

indicator at meter panel 1A15A8. The input connectors

k13. The chart shows output signal status for normal

are shown in figure 2-29 for AN/GRC-144(V) 3 and in

and fault conditions and signal routing. Chart data is

figures 2-30 and 2-31 for AN/GRC-144(V)4. These are

applicable to both AN/GRC-144(V) 3 and AN/GRC-

simplified schematic diagrams; for the complete

144(V)4, except for relay K1. In AN/GRC-144(V)3,

schematic diagram of relay assembly 1A15A18 see

there is no input at 1A15A18E2, K1 is always

deenergized and the output signals at 1A15A18E3 is

always open circuit.

Relay Assembly 1A15A18 Alarm Signal Data

Change 6

2-108.1