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OM-2031
(c) Indicating lights
The function of these lights (10, 11, 13, 14 and 15) is to indicate, to the operator, the ab-
normal condition of overvoltage, underfrequency, etc., which caused the protective moni-
tor system to function. Each of the five lights is connected to an actuating circuit within
the memory and time delay module. When one of the circuits is activated, it turns on the
applicable indicating light. The light will remain on until the reset switch (7) is pushed. All
lamps in indicating lights may be tested by pressing switch (8) .
(d) Plug-interlock relay
The function of the plug interlock relay (1) is to cause the output load contactor to open in
the event the cable plug connector becomes accidentally disconnected from the aircraft
during power delivery, or if an attempt is made to deliver power when the output cable is
not connected to the aircraft. Twenty-eight-volt, direct current for operation of the relay is
supplied from the aircraft either through an on-board transformer rectifier, or from a
twenty-eight-volt, electrical system. Connection from the aircraft to the interlock relay is
made through terminals E and F on the output cable plug connector.
(e) Test-bank switch
A spst, toggle switch (18) provides a means of by-passing the interlock relay (1) when
supplying power to a load bank or to an aircraft not equipped with a plug interlock system.
(f) Resistor
A 100-ohm, 25-watt resistor (21) is connected in series with the plug interlock relay to pro-
tect the relay in the event that phase C contacts in the load contactor should fail to close
when the generator ON switch is operated.
(g) Fuse-interlock relay
The function of the fuse-interlock relay (2) is to interrupt the load contactor holding coil cir-
cuit and remove the load in case of a "blown" fuse (17) in the protective relay coil circuit.
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April 30/96 Revised
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