Instruction Manual

REVISION 9/04 BJF
73
TROUBLESHOOTING
SECTION 7-4
PROBLEM
-Electrical Faults-
PROBABLE CAUSE REMEDY
A.) Motor fails to start. 1.) Power supply failure. 1.) Check fuses.
2.) Starter is inoperative. 2.) Check supply mains. Also
check the starter contacts for
burning, replace in necessary.
3.) Starter overloads cut out. 3.) Check the current
requirements on the motor
nameplate.
4.) Safety interlock is inoperative. 4.) Check and adjust as
necessary.
B.) Motor starts, but will not take
loads.
1.) Too much belt tension. 1.) Check belt tension and adjust
as necessary. Refer to Section 4.
2.) Motor is improperly wired. 2.) Check terminal connection
with the manufacturer’s
connection diagram located in the
conduit box and adjust as
necessary.
3.) Defective starter winding. Check current in each phase with
an ammeter. If there is marked
difference in any one phase,
contact the motor manufacturer.
C.) Motor starts when
disconnected from load, but not
when connected.
1.) Worn bearings. 1.) Check and replace if
necessary, in accordance with the
manufacturer’s literature.