TM 5-3610-253-14
Table 5-21.
ORGANIZATIONAL TROUBLESHOOTING - Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
18. MAIN MOTOR WILL NOT START.
Step 1.
Check to see that main motor overload relay is on (I), and not
tripped.
(a) If main motor overload relay is not tripped, proceed to step
2.
(b) If tripped, reset overload relay. If relay trips again,
proceed to step 4.
(c) If relay does not trip again and main drive motor is still
inoperable, proceed to step 2.
Step 2.
Check for power to main drive motor overload relay as follows:
a.
Turn Star-Delta switch to Y position, then to O position.
b. Turn main power switch to O position.
c.
Remove front electronics enclosure cover.
d. Remove main drive motor overload relay cover.
e.
Turn main power switch to I position.
f. Turn Star-Delta switch to Y position, then to
position.
Check for 120 5 V ac at input of three contacts on overload relay.
g.
(a) If voltage is correct, proceed to step 3.
(b) If voltage is not present, refer to direct/general
support maintenance for replacement of Star-Delta switch
Check for 120 5 V ac at output of three contacts on overload
Step 3.
relay.
(a) If voltage is not present, replace overload relay,
(b) If voltage is correct, proceed to step 4.
