TABLE 1-2. Performance Characteristics - Continued
ARMY TM 9-6115-645-24
AIR FORCE TO 35C2-3-444-12
MARINE CORPS TM 09244A/09245A-24/2
MEP-806A
MEP-813A
1. Voltage - Continued:
k. Adjustment range VAC
50 Hz
400 Hz
120/208V connection
190-213V
195-229V
240/416V connection
380-426V
395-458V
60 Hz
120/208V connection
197-240V
240/416V connection
395-480V
2. Frequency:
a. Regulation
0.25% of rated frequency
0.25% of rated frequency
b. Short-term steady-state stability
0.5% of rated frequency
0.5% of rated frequency
(30 seconds)
c. Long-term steady-state stability (4 hours)
1% of rated frequency
1% of rated frequency
d. Frequency drift (60°F(16°C) in 8 hour
0.5% (max)
0.5% (max)
period)
e. Undershoot with application of load
4% of rated frequency (max)
1.5% of rated frequency
(max)
Recovery time
2 seconds
1 second
f. Overshoot with application of load
4% of rated frequency (max)
1.5% of rated frequency
(max)
Recovery time
2 seconds
1 second
g. Adjustment range
58-52 Hz, not below 45 Hz
390-420 Hz, not below 370
for 50 Hz operation
Hz or above 430 Hz
58-62 Hz, not above 65 Hz
for 60 Hz operation
SECTION Ill. PRINCIPLES OF OPERATION
1-11 INTRODUCTION.
This section contains functional descriptions of the generator set and explains how the controls and indicators interact
with the systems, and the location and description of major components.
1-12 PRINCIPLES OF OPERATION.
1-12.1 Fault System.
1-1 2.1.1 The Fault System (FIGURE 1-2) protects the generator set and any connected load against the potential faults
described below and provides an indication of any incurred fault. The following summary of the Fault System will assist
in understanding the operation of other generator set systems. Additional details relating to specific protection devices
are provided in the descriptions of the respective systems.
1-12.1.2 The Fault System consists of the malfunction indicator, low fuel level float switch, fuel float switch module, fuel
level relay, low oil pressure switch, coolant high temperature switch, overvoltage relay, overload/short circuit relay, over-
speed switch, overspeed relay, OVERSPEED RESET switch, undervoltage relay, reverse power relay, engine fault relay,
electrical fault relay, and BATTLE SHORT switch. In addition to the fault indicator lamps, the malfunction indicator includes
the PUSH TEST & RESET LAMPS switch which when depressed, illuminates all the lamps and resets any fault indication.
1-12.1.3 Activation of any one of the following protection devices will cause three events to occur. The AC circuit inter-
rupter relay will open; the generator set engine will be shut down; and a fault indicator lamp will be illuminated to show
which malfunction occurred.
1-8
