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 TM 5-683/NAVFAC MO-116/AFJMAN 32-1083
Table 5-2. Motor control troubleshooting chart.
REMEDY
CAUSE
1. Contactor or Relay Does
not Close
Check fuses and disconnect
No supply voltage.
switches.
Wire may be
Check power supplY.
Low voltage.
to small.
Replace.
Coil open or shorted.
Check coil number.
Wrong coil.
With power off, check for free
Mechanical obstruction.
movement of contact and armature
assembly.
Clean or replace if badly worn.
Pushbutton contacts not
making.
Adjust or replace if badly worn.
Interlock or relay contact
not making.
Turn power off first, then check
Loose connection.
the circuit visually with a
flashlight.
Reset
Overload relay contact open.
2. Contactor or Relay Does Not
Open
Check connections with wiring
Pushbutton not connected
diagram.
correctly.
Replace.
Shim in magnetic circuit (DC
only) worn, allowing
residual magnetism to hold
armature closed.
Adjust contact travel.
Interlock or relay contact
not opening circuit.
Check control wiring for
"Sneak" circuit.
insulation failure.
Clean with solvent.
Gummy substance on pole
faces.
Replace parts.
Worn or rusted parts causing
burning
See Item 3.
Contacts weld shut.
5-19
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