ARMY TM 9-6115-639-13
AIR FORCE TO 35C2-3-386-51
MARINE CORPS TM 10155A-13/1
f. Should engine oil pressure drop below 15 psi, a low oil pressure switch (OP) closes the circuit to
energize the fault lockout relay (K12) and shut down the engine. The LOW OIL PRESS indicator on the
malfunction indicator module (A2) will illuminate. The FAULT RESET / LAMP TEST switch must be
depressed to reset the fault lockout relay.
g. Relay K8, located in the power inverter / converter (A8), is energized if a short circuit or overload
condition exists. The overload condition may be either a current overload or a real power (kW) overload. The
AC circuit interrupter (K1) opens, disconnecting power from the load. The OVERLOAD SHORT CIRCUIT
indicator on the malfunction indicator module (A2) will illuminate. Once the malfunction has been corrected,
the malfunction indicator can be reset by depressing the FAULT RESET / LAMP TEST button. AC circuit
interrupter (K1) can be closed.
h. Relay K6, located in the power converter (A8), is energized if a short circuit condition exists. The
fault lockout relay (K12) will energize, stopping the engine. The system is reset by placing the START / RUN /
STOP switch in the STOP position.
i.
Relay K3, Located in the power converter (A8), is energized if an overvoltage condition exists. The
fault lockout relay (K12) is energized, stopping the engine. The AC circuit interrupter (K1) opens,
disconnecting power from the load. The OVER VOLTAGE indicator on the malfunction indicator module (A2)
will illuminate. The fault lockout relay (K12) will lockout power to the engine until the FAULT RESET /
LAMP TEST button on A2 is depressed.
j.
The engine is supplied with a conventional mechanical governor. The maximum no load,
mechanically governed speed is factory set to 3800 RPM. An electric governing system overrides the
mechanical governor, regulating no load speed to 3000 to 3050 RPM and rated load speed to 3400 to 3450
RPM. During manual starting, the electric governor actuator is locked in position close to the full fuel position
and the mechanical governor takes over.
k. In an emergency situation, the BATTLE SHORT switch (S7) can be activated to allow generator set
operation under certain fault conditions. Placing the switch (located on the control panel) in the ON position
bypasses all faults except the overload short circuit condition. The BATTLE SHORT indicator on the
malfunction indicator module (A2) will illuminate. The generator set will continue to operate under high
temperature, low oil pressure, low fuel, overvoltage, or overload short circuit condition. The appropriate
indicator light on A2 will illuminate. The engine cannot be started with the BATTLE SHORT switch in the ON
position.
l.
In generator set model MEP 832A (400 Hz), two thermostatically controlled DC ventilation fans (B2
and B3) are mounted in the generator set enclosure assembly. These fans provide internal cooling of the
generator set under high temperature operating conditions. The fan temperature switches (S20 and S21) are set
to turn on fan B2 when internal air temperature reaches 85F (29C), and fan B3 when internal air temperature
reaches 110F (43C).
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