TM 10-4610-239-24
TM 08580B-24/3
3-49.
REPAIR MOTOR CONTROLLERS (RELAYS K-3 THROUGH K-7) AND A200MOCAC.
This task covers:
a. Disassembly.
b. Cleaning.
c. Inspection.
d. Assembly.
e. Test.
INITIAL SETUP.
a.
Tools. Tool Kit (Appx B, Sect III, Item 10).
Soft-Bristled Brush (Appx B, Sect III, Item 2).
Multimeter (Appx B, Section III, Item 6).
b.
Materials/Parts.
Dry-cleaning Solvent (Appx C, Sect II, Item 16).
c.
Equipment Condition.
Motor controller removed from electrical junction box (paragraph 3-48).
d.
General Safety Requirements.
WARNINGS
High voltages in this equipment can cause serious injury or death.
When applying power during a test, take proper measures to ensure
personal safety. Never work on electrical equipment unless there is
another person nearby who is familiar with the operation and hazards
of the equipment and who is competent in administering first aid.
Burned out overload relay may cause fire or electrical shock.
Dry-cleaning solvent AA 711 TYPE I & II is highly toxic and can ignite
organic materials, nitrates, carbides, and chlorates. Wear eye, skin,
and respiratory protection. Use in a well-ventilated area.
DISASSEMBLY.
NOTE
There are five motor controllers covered in this task. All are
disassembled the same. Minor differences are noted in text.
a.
For K3 thru K6, tag and remove wire (1) from upper base structure (2) and overload relay (3). For K7, tag and
remove three wires (1) from upper base structure (2) and overload relay (3).
b.
For K3 thru K6, remove six screw (4) and three connector straps (5). For K7, remove four screws (4) and two
connector straps (5).
c.
Remove two screws (6), lockwashers (7), and overload relay (3). Discard lockwashers.
d.
Loosen two captive screws (8) and remove arc box (9).
e.
For K3 thru K6, remove four moveable contacts (10) and springs (11) from crossbar (12). For K7, remove two
moveable contacts (10) and springs (11) from crossbar (12).
3-205
