MEP-802A
MEP-812A
(h) Voltage drift (60°F
2% (max)
2% (max)
(16°C) in 8-hour period)
(i) Dip and rise for rated load
20% of rated voltage (max)
20% of rated voltage (max)
Recovery time
3 seconds
3 seconds
(j) Dip for low power factor load
35% of no-load voltage (max)
35% of no-load voltage (max)
Recovery time
5 seconds 95% of no–load voltage
5 seconds 95% of no-load voltage
(k) Adjustment range VAC
60 HZ
400 Hz
120V connection
114-126V
114-126V
120/240V connection
228-252V
228-252V
120/208V connection
205–220V
205–220V
2 Frequency:
(a) Regulation
3% of rated frequency
3% of rated frequency
(b) Short-term steady-state
2% of rated frequency
2% of rated frequency
stability (30 seconds)
(c) Long-term steady-state
3% of rated frequency
3% of rated frequency
stability (4 hours)
(d) Frequency drift (60°F
2% (max)
2% (max)
(16°C) in 8 hour period)
(e) Undershoot with
3% of rated frequency (max)
3% of rated frequency (max)
application of load
Recovery time
3 seconds
3 seconds
(f) Overshoot with
4% of rated frequency (max)
4% of rated frequency (max)
application of load
Recovery
3 seconds
3 seconds
(9) Adjustment range
± 3% for 60 Hz
± 3% for 400 Hz
ARMY TM 9-6115-641-24
AIR FORCE TO 35C2-3-456-12
Table 1-2. Performance Characteristics - Continued
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 O F OPERATION.
1-12-1. Fault System
1-12-1-1. 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, oil pressure relay, coolant high temperature switch, overvoltage relay, overload/
short circuit relay, engine 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.
1-7
