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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 2-2. Transformer Troubleshooting
CHAPTER 2
DIRECT AND GENERAL SUPPORT
MAINTENANCE INSTRUCTIONS
Section I. REPAIR PARTS, SPECIAL TOOLS AND EQUIPMENT
2-1. Special Tools and Equipment
2-2. Direct and General Support Maintenance Repair
No special tools or equipment are required by direct and
Parts
general support maintenance personnel for performing
Direct and general support maintenance repair parts are
maintenance on the substation.
listed and illustrated in TM5-6120-250-34P.
Section II. TROUBLESHOOTING
mobile substation and its components.  Malfunctions
WARNING
which may occur are listed in tables 2-1 through 2-4.
Each malfunction stated is followed by a probable cause
Before inspection or any maintenance work is
and recommended corrective action.
performed, all electrical power should be
disconnected, both the source and load.
2-4. Load Break Switch Troubleshooting
Table 2-1 lists the load break switch troubleshooting
2-3. General
malfunctions for direct and general support maintenance
This section provides information useful in diagnosing and
personnel.
correcting unsatisfactory operations or failure of the
Table 2-1. Load Break Switch Troubleshooting
Malfunction
Probable Cause
Corrective Action
1.
Overheating.
a. Adjust (para 2-14).
a. Contact not aligned.
b. Contacts dirty, greasy, or coated
b. Clean contacts (para 2-14).
with dark film.
c. Contacts badly burned or pitted.
c. Replace contacts and adjust
movement (para 2-14).
d. Connection to switch terminals
d. Tighten, but do not exceed elastic
not tight.
limit of bolts and nuts. (table 1-1).
2.
Operates Hard.
a. Switch loose on mounting frame
a. Tighten mounting bolts, but do
allowing it to twist.
not exceed elastic limit of bolts and
b.
Switch movement loose.
b. (Check all nuts, washers, bolts,
cotter pins for tightness. Check for
binding or excessive friction. (para
c.
Mechanisms dry.
c. Check and see that all bearings
and other moving parts for need of
lubrication or dry hardened old
malfunctions
for  direct
and
general
support
2-5.
Transformer Troubleshooting
maintenance personnel.
Table
2-2  lists  the  transformer
troubleshooting
2-1

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