Urschel COMITROL 2100, Instruction Manual

Page: 125 / 166

47
MAINTENANCE
Electrical Assembly
Fuses (NEMA & CE enclosures):
Remove fuses and transformer fuses.
Check with an ohmmeter. If one fuse is
replaced, all others of that type fuse should
also be replaced.
Heaters (NEMA enclosure): If heaters
(thermal overloads) have been tripped sever-
al times they may fail to reset. If one heater
fails, all heaters in that starter should be
replaced. Check for proper motor current
draw if heaters continue to trip.
Starter coil (NEMA enclosure):
Disconnect leads from coil at the front of the
motor starter and check with an ohmmeter.
Replace if necessary.
Contactor (CE enclosure): Disconnect
leads from coil on top of contactor and check
with an ohmmeter. Replace coil or contactor if
necessary.
Overload relay (NEMA & CE enclo-
sures): If overload relay has been tripped
several times, it may fail to reset and must be
replaced. Check for proper motor current
draw if overload relay continues to trip.
(“Electrical Assembly”, con’t. on page 48)
Figure 35 — Typical starter enclosure interior (CE
compliant). (1) Circuit Breaker, (2) Transformer
Fuses, (3) Transformer, (4) Amplifier, (5) Fuses, Feed
Screw Motor, (6) Fuses, Agitator Motor, (7) Relays,
(8) Contactor, Agitator Motor, (9) Contactor, Feed
Screw Motor, (10) Contactors, Impeller Motor, Y-D
start, (11) Overload Relays
4
3
2
1
5
6
7
10
11
8
9
See the Addendum for
updated information