Hobart 9OC24S Operation Manual page 58

yOBAR1
I
a
QD
2MOTOR GENERATOR DIVISION
5
'c
z
HOBART BROTHERS COMPANY
*F Q. B&13
d
(4
(4
(4
'V)
63)
0-4
l-l-..-
Page 22
OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO. 5381A
Indicating lights
The function of these lights (8, 10, 12, 13 and 15) is to indicate, to the
operator, the abnormal condition of overvoltage, underfrequency, etc.,
which caused the protective monitor system to function. Each of the five
lights is connected to an actuating circuit within the memory.and time
delay module (1). When one of the circuits is activated, it turns on the
applicable indicating' light. The light will remain on until the reset switch
(9) is pushed. These are press-to-test type lights in which the lamps (bulbs)
may be tested by pressing the lens holder momentarily.
Plug-interlock relay
The function of the plug-interlock relay (18) is to cause the output load con-
tactor 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 air-
craft.
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 air-
craft to the interlock relay is made through terminals "E" and "F" on the
cable connectors.
Test-bank switch
A sp st, toggle switch (16) provides a means of by-passing the interlock relay
(18) when supplying power to a load bank or to aircraft not equipped with
a plug interlock system.
Resistor
A loo-ohm, 25-watt resistor (1 1) is connected in series with the plug inter-
lock relay to protect the relay in the event that phase C contacts in the load
contactor should fail to close when the generator ON switch is operated.
Fuse-interlock relay
The function of the fuse-interlock relay (2) is to interrupt the load contactor
holding coil circuit and remove the load in case of a "blown" fuse (14) in
the protective relay coil circuit.
Connector
A twenty-six contact connector (17) provides a quick-disconnect facility for
all wiring to the tray electrical components so that the complete tray assembly
may be removed quickly and eas-ily.