Checking Connections And Leads; Electric Governor Trouble Shooting - Hobart 60PL20 Operation And Maintenance Manual

Trip
Overload
Overvoltage
Undervoltage
Overfrequency

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
December 30/93 Revised
PC Board Trip Value
387738A 112 KVA
482038 130 - 134 V-AC
482038A 125.5 - 126.6 V-AC
482038 93 - 102 V-AC
482038A 95 - 100 V-AC
482039 415 - 425 Hz
482039A 415 - 425 Hz
482039B 425 - 430 Hz
482039C 420 - 425 Hz
PC Board Trip Values, Trip Times, and Reset Values
Trip Time Within:
5 Minutes
———————-
1 - 2 seconds
4 - 12 seconds
7 - 8 seconds
———————-
———————-
5 - 6 seconds
5 - 6 seconds
Table 1
OM-2053
Reset Value
——————
—-
125 V-AC
120 V-AC
110 V-AC
105 V-AC
410 Hz
410 Hz
415 Hz
415 Hz
3-1
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