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OM-2031
(h) Connector
A twenty-six contact connector (19) provides a quick-disconnect facility for all wiring to
the tray electrical components so that the complete tray assembly may be removed
quickly and easily.
(k) Auxiliary underfrequency relay
The function of the auxiliary underfrequency relay (3) is to automatically open the excita-
tion-deenergization relay and disconnect the voltage regulator anytime generator fre-
quency drops to 380 Hz or below. This protects the voltage regulator (Fig. 10) and ballast
resistors (2, Fig. 7) against overload which could be caused by very high voltage regula-
tor output in its attempt to maintain voltage when the generator is operating at a speed
which cannot produce normal voltage output.
NOTE: If the auxiliary underfrequency relay is tripped, it will be necessary to momentarily place
engine operating mode switch (5, Fig. 9) in BUILD-UP-VOLTAGE position to restore generator
voltage.
F. Engine Control Panel (See Fig. 9)
The engine control panel is mounted directly below the control box. In addition to engine con-
trols and instruments, generator output controls are mounted here. A Plexiglass window in
the canopy rear door, slants outward at the bottom to form an opening for access to controls
when the door is closed.
(1) Engine instruments
Engine operation is monitored by an ammeter (4) , a coolant temperature gage (8) , and
an oil pressure gage (10) . An hourmeter (6) records engine operating time.
(a) Ammeter
The ammeter (4) indicates the direction and value of current flow in the 12-V DC electrical system. Its
graduated range is from -60 A through 0 A, to +60 A.
(b) Temperature gage
The temperature gage (8) is a mechanical type of unit construction. It consists of a panel mounted in-
dicating mechanism which is connected by a capillary tube to a bulb mounted in the engine cooling sys-
tem. The gage indicates engine coolant temperature in the range of 100F to 220F.
(c) Oil pressure gage and oil pressure switch
The oil pressure gage (10) is a bourdon tube type and indicates engine lubricating oil pressure. It is
graduated from 0 PSI to 75 PSI. An oil pressure switch is mounted in a tee fitting directly behind the gage.
The switch connects 12-V DC power to the engine control system and to the generator 12-V DC control
system when the engine is running.
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Page 20
April 30/96 Revised
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