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Table - TM-5-6120-250-120086
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TM-5-6120-250-12 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Manual
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Section IV. RADIO INTERFERENCE SUPPRESSION
Section III. ORGANIZATIONAL MAINTENANCE TROUBLESHOOTING
troubleshooting malfunctions, probable causes and
4-6. General
recommended corrective actions. Probable causes and
For  a  general  description  and  purpose  of  the
corrective actions beyond the scope of organizational
troubleshooting table, refer to paragraph 3-6.
maintenance  shall  be  referred  to  direct  support
maintenance.
4-7. Organizational Maintenance Troubleshooting
Table 4-2 lists the organizational maintenance
Table 4-2. Organizational Maintenance Troubleshooting.
Malfunction
Probable Cause
Corrective Action
1. Overheating (Breakers)
a. Contacts not aligned.
a. Refer to DS Maintenance
b. Contacts badly burned or pitted.
b. Refer to DS Maintenance
c. Contacts dirty, greasy or coated
c. Refer to DS Maintenance
with dark film.
d. Inductive heating.
d.
Refer to DS Maintenance
e. Current-carrying surfaces dirty.
e.
Refer to DS Maintenance
f. Current in excess of breaker rating.
f.
Refer to DS Maintenance
g. Corrosive atmosphere
g.
Refer to DS Maintenance
h. Insufficient bus or cable capacity.
h.
Refer to DS Maintenance
i. Bolts and nuts at terminal con-
i.
Refer to DS Maintenance
nections not tight.
j. Excessive ambient temperature.
j. Refer to DS Maintenance
2. Failure to trip AK-2 Breakers
a. Travel of tripping device does not
a. Refer to DS Maintenance
provide positive release of
tripping latch.
b. Worn or damaged trip unit parts.
b.
Refer to DS Maintenance
c. Binds in overcurrent trip device.
c.
Refer to DS Maintenance
d. Calibration setting high.
d.
Refer to DS Maintenance
3. False Tripping AK-2 Breakers.
a. Overcurrent pick up too low.
a.
Refer to DS Maintenance
b. Overcurrent time setting too short.
b.
Refer to DS Maintenance
4. Failure to Close and Latch
a. Binding in attachments preventing
a.
Refer to DS Maintenance
(Breakers).
resetting of latch.
b. Latch out of adjustment.
b. Refer to DS Maintenance
c. Latch return spring too weak or
c. Refer to DS Maintenance
broken.
d. Hardened or gummy lubricant.
d. Refer to DS Maintenance
e. Safety pin left in push rod.
e. Refer to DS Maintenance
5. Burned Main Contacts
a. Improper contact sequence (main
a. Refer to DS Maintenance
contacts not sufficiently parted
when arcing contacts part.)
b. Short-circuit current level above
b. Refer to DS Maintenance
interrupting rating of breaker.
c. Loss of contact wipe or pressure.
c. Refer to DS Maintenance
6. Unnecessary tripping (Tripping
a. Calibration setting too low.
a. Set device for proper value ac-
when tripping should not occur.)
cording to ampere load of circuit.
b. Worm latch (breaker easily jarred
b. Refer to DS Maintenance
open ).
7.
Failure to close or latch.
Out of adjustment.
Refer to DS Maintenance
8.
Meters faulty.
Damaged meter.
Replace para 4-21
9.
Transformer gages faulty.
Damaged gages.
Replace. para 4-13, 4-14, 4-15
10.
Meter selector switch faulty.
Damaged contacts or Springs.
Replace.  para 4-22
11.
Compartment heater not
Faulty heater.
Replace para 4-10, 4-20
working.
12.Trailer lights flicker or will not
a. Short circuit in trailer wiring or
a. Check wiring for breaks or bare
light
connection box
spots, tape bare spots. para 4-47.
b. Intervehicular cable damaged.
b. Replace cable.
c. Dirty or corroded contacts.
c. Clean contacts.
d. Other cause
d. Report other cause to DS
Maintenance.
13.Trailer brakes will not apply or
a. Adjustment too loose
a. Adjust brakes. para 4-41.
hold
b. Clogged air filter
b. Clean air filter in service port of
emergency relay valve. para 4-42
4-3

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