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CHAPTER 2 DIRECT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS
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TM-5-6120-250-34 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Avionics Model 950-2200A Manual
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Table 2-4. Semi-trailer Troubleshooting
Table 2-2. Transformer Troubleshooting
Malfunction
Probable Cause
Corrective Action
High liquid and/or wind temperature
a. Low liquid level.
a. Check gages for damage, replace if
damaged.
b. Leak of liquid coolant.
b. Check pressure gage reading.  (No
change in pressure with a temp. rise
indicates a leak.) Inspect transformer
for leaks.
Report leaks to depot
maintenance.
c. Rise in line load and / or ambient
c. Report to systems engineer.
Temperature.
work is being done on a circuit breaker, make sure
2-6. Circuit Breaker Troubleshooting
Table 2-3 lists the circuit breakers troubleshooting
that it is in the open position and the closing springs
malfunctions for direct and general support maintenance
are restrained by the safety pin.
personnel.
WARNING
When
inspecting,
removing,
installing
or
maintenance
Table 2-3. Circuit Breaker Troubleshooting
Malfunction
Probable Cause
Corrective Action
1.
Overheating.
a. Contacts not aligned.
a. Adjust. (para. 5-71.
b. Contacts badly burned or pitted.
b. Replace and check adjustment, align-
ment mechanisms. (para. 5-11).
c. Current-carrying surfaces dirty.
c. Clean all current-carrying surfaces.
2.
AK-2 (Feeder) Breaker Fail to
a. Travel of tripping device does not
a. Readjust or replace tripping
Trip.
provide positive release of tripping
device. (para. 5-15, 5-16).
latch.
b. Worn or damaged trip unit parts.
b. Replace trip unit. (para. 5-16).
c. Binds in overcurrent trip device.
c. Replace overcurrent trip device.
3.
Failure to Close
a. Binding in attachments preventing
a. Check and readjust. (para 5-15).
resetting of latch.
b. Latch out of adjustment.
b. Readjust. (para 5-15)
c. Hardened or gummy lubricant.
c. Clean bearing and latch surfaces.
d. Latch return spring too weak or
d. Replace spring.
broken.
4.
Burned Main Contacts.
a. Improper contact sequence (Main
a. Increase arcing contact wipe.
contacts not sufficiently parted
Adjust contact sequence. (pars 5-
When arcing contacts part.
7, 5.9).
b. Loss of contact wipe or pressure
b. Replace stationary contact spring
and dress up or replace contacts.
5.
Unnecessary Tripping (that is
a. Calibration setting too low.
a. Check tripping device for proper
tripping when tripping should not
setting. (para 5-15).
Occur.)
b. Worn latch (breaker easily jarred
b. Replace with new part.
open)
malfunctions for direct and general support maintenance
2-7. Semi-trailer Troubleshooting
personnel.
Table  2-4
lists  the  semi-trailer
troubleshooting
2-2

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