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Figure 2-5. Generator Set Controls and Instruments (Sheet 6 of 6) | Up
TM-5-6115-545-12 Power Unit Utility Pack Gas Turbine Engine Driven (Air Research Model PPU85-5) Non-Winterized and (Air Research Model PPU85-4) Winterized Manual | Next
Section IV. OPERATION UNDER USUAL CONDITIONS |
Table 2-2. Fault Indicators Function
INDICATOR
FUNCTION
(Fig. 2-5)
LOW OIL PRESSURE
Lights if oil pressure drops below 20 ± 2 psi.
COOLANT HIGH TEMP
Lights if coolant temperature rises above
222 ± 3° F.
OVERSPEED
Lights if engine rpm reaches 2400 to 2450 rpm.
NO FUEL
Lights if fuel in day tank falls to level permitting
only one minute of engine operation.
SHORT CIRCUIT
Lights if output reaches 425 ± 25% of rated current.
OVER LOAD
Lights if any phase current exceeds 110% of
rated load.
UNDER VOLT
Lights (Class 1 sets only) instantaneously if output
falls below 48 volts, or 6 ± 2 sec after output
reaches 99 ± 4 volts.
UNDER FREQ
Lights on (Class 1 sets only) when output freq drops
to: Mode I - 46 ± 1 Hz for 50 Hz operation, 55 ± 1
Hz for 60 Hz operation, Mode II - 370 ± 5 Hz for
400 Hz.
REVERSE POWER
Lights if power flow into set exceeds 20% of rated
value.
OVER VOLT
Lights if output voltage rises above 153 ± 3 volts.
Change 1
2-17
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