Overload Check; Compressor Check; Capacitor Check; Troubleshooting Gear Motors - Cornelius IMD300-15A Installation Manual

Countertop Icemaker IMD Series Installation Manual
2. Disconnect the fan motor leads. Since capacitors store energy, short the capacitor with a screwdriver. This will
prevent shocks.
3. Disconnect the compressor terminal wires.
Figure 10. Overload Check
O C
VERLOAD HECK
Using a volt-ohm meter check the continuity across the overload, contacts #1 & #3. If none, wait for unit to cool
down and try again. If still no continuity, the overload protector is defective and should be replaced.
C C
OMPRESSOR HECK
The resistance readings on the windings will be between 0.25 and 10.00 ohms, a meter capable of these low read-
ings must be used.
1. Check between "C" & "R". Replace compressor if there is no continuity as the run windings are open.
2. Check between "C" & "S". Replace the compressor if there is no continuity as the start windings are open.
3. Check between "C" & "R", or "S" and shell of the compressor. If there is continuity replace the compressor as
the motor is grounded.
4. Check between screw terminal on the overload and "C" on the compressor. Check and repair the lead or con-
nections if there is no continuity.
C C
APACITOR HECK
1. Check or replace start capacitor, disconnect bleed resistor before checking for shorted capacitor.
2. Check or replace run capacitor (if supplied), check for shorted capacitor or either terminal grounded to case.
T
ROUBLESHOOTING
Basically, gear motor problems can be narrowed down to three areas of checkout.

The Gear motor will not run

1. No voltage to the transmission terminals - check external circuit.
2. Low voltage - check supply.
3. Problems in the gear motor electrical circuit. See Figure 12.

The Gear motor Starts but Trips Repeatedly on the Overload Protector

1. Voltage - high or low voltage can cause the overload to trip.
2. High gear motor amperage draw, see Specification Chart for ratings and Troubleshooting Guide.
Publication Number: 638085277INS
G M
EAR OTORS
Figure 11. Compressor Check
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