TM 9-4110-258-13
4.25 MOTOR STARTER K1 TESTING. REPAIR, AND REPLACEMENT.
This task covers:
a. Testing
b. Removal
c. Installation
INITIAL SETUP
Materials/Parts
Equipment Conditions:
Lock Washers (2) (Motor Starter
Refrigeration unit shut down (para 2.7) and power
1, Appendix G
disconnected.
Marker Tags (11)
Control box cover door raised and latched
7, Appendix E
General Safety Instructions:
WARNING
High voltage and exposed rotating parts are
used in the refrigeration unit. Personal injury
can result if power is connected.
a.
Testing. (See Figure 1-4.)
(1) Be sure power has been disconnected at the source and remove six screws (1). Open control box cover
(2).
(2) Press and hold plunger (3).
(3) Using multimeter set to measure continuity, check each motor starter (4) contact continuity between
terminals L1 to T1, L2 to T2, and L3 to T3. Continuity should be indicated.
(4) Release plunger (3).
(5) If no continuity was indicated, test thermal overload heaters (5) per following step.
(6) Using multimeter set to measure continuity, check each thermal overload heater (5) continuity between
mounting screws. Continuity should be indicated. If no continuity was indicated, replace thermal overload
heater (5) to repair motor starter (4) and repeat tests.
(7) Using multimeter set to measure continuity, check coil continuity between terminals Al to A2. Continuity
should be indicated. If no continuity was indicated, replace motor starter (4).
(8) Press and release RESET button (6).
(9) Using multimeter set to measure continuity, check overload contacts between terminals 95 to 96
Continuity should be indicated. If no continuity was indicated, replace motor starter (4).
(10) Using multimeter set to measure continuity, check each motor starter (4) contact continuity between
terminals L1 to T1, L2 to T2, and L3 to T3. No continuity should be indicated. If continuity was indicated,
replace motor starter.
(11) If no failure was indicated, close control box cover (2) and install six screws (1).
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