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6. Test Values
Although test values are provided throughout the trouble shooting chart, where applicable, additional infor-
mation and values are given here.
Generator output at maximum
voltage regulator rheostat setting 134 V or higher
Generator output at minimum
voltage regulator rheostat setting 108 V or lower
Overload relay trips at any value above 112 KVA in 5 minutes.
Overvoltage relay trips at 130 to 134 V AC, resets at 125 V AC.
Undervoltage relay trips at 93 to 102 V AC, resets at 110 V AC.
Undervoltage time delay circuit functions in 4 to 12 seconds.
Overfrequency relay trips at 415 to 425 Hz, resets at 410 Hz.
Underfrequency relay trips at 375 to 380 Hz, resets at 385 Hz.
Overload relay trips at 125% rated load in 5 minutes.
See 2-3, Fig. 8 for typical test values at test receptacle and test box.
7. Checking Connections and Leads
ALWAYS make a check of connections and leads to a component suspected of being faulty. With the ex-
ception of a few instances, we will assume that connections and wiring have always been checked first
and that power has not been lost as a result of defective wiring or connections.
8. Electric Governor Trouble Shooting
The following facts concerning the operation of the electric governor may be helpful in understanding the
system and in determining which unit in the system is faulty in case of troubles.
A. The system requires two sources of power to operate normally.
(1) 12-V DC input power (from engine electrical system)
(2) 4-V AC input power (from magnetic pickup)
B. Assuming other conditions are normal, the actuator will go to, or remain in, IDLE position under the
following conditions.
(1) No 12-V DC power
(2) No voltage from control box to actuator
C. The actuator will "surge" under the following conditions:
(1) "Stability" or "gain" adjustment set too "high"
(2) Throttle linkage binding
August 5/89 Revised
OM-2031
3-1
Page 3
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