Cornelius UCR 700 Series Manual de Serviço Página 19
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630460154
GEARMOTOR
The gearmotor is equipped with a start relay and a manual reset overload.
When current is applied, the relay energizes and completes the circuit to the start winding. The motor reaches a
predetermined speed and the relay drops out, disconnecting the start winding. The run winding remains in the
circuit as long as current is applied.
The purpose of the overload is to automatically shut off the motor in the event of a mechanical bind of the trans-
mission, an overload condition within the evaporator or an electrical malfunction. It does this by sensing amper-
age draw . If the motor stalls the start relay would energize and stay energized. The amperage would surge 5 to
6 times greater than the normal draw. In this event the overload would shut off the transmission in 4 to 8 sec-
onds.
If the motor is subjected to an abnormal load, but does not reach a stall condition, the overload will react, but
over a greater period of time. The reaction time depends upon the amperage to which it is subjected.
The overload, through the safety circuit, also shuts off the compressor.
GEARMOTOR
OVERLOAD TRIPPED
Check water l evel control
and evaporator water tube
for line build-up restrictions.
Clear ice from
evaporator and
auger before
resetting overload.
CLEAN
CAUTION
See Instructions .
Overload
hot try
again.
YES
NO
Reset overload.
Resets but
motor does
not run.
Will not
Reset.
Icemaker
runs.
IMPORTANT
Will not
reset.
Replace
overload.
Resets but
motor does
not run.
Check
gearmotor
circuits.
Short run. Trips
again in 2
minutes. Check
gearmotor circuits.
Icemaker runs when
reset but problem has
not been found.
Continue check ing for
overload as follows to
guard against future
problems.
OVERLOAD GUIDE
ELECTRICAL:
S High or low v oltage. W eak power li nes can cause overloads on icemakers restarts.
S High running current (2.4amps or above). Check motor circuits and s tart relay.
S Auger delay failed.
ICEMAKER
S Mechanical parts worn. Sc ored evaporator or auger. Worn thrust bearing.
S Icemaker not turning off. Failed i ce level control.
S Over compression. Low water inlet temperature. Restrictions in water line from reservoir.
REFRIGERANT
S Contaminated charge or bad compressor.
S Low charge or gas leak.
S Low suction press ure. Improper expans ion valve. Sens ing bulb l ocation or insulation
and/or defective expansion valve.
MOTOR CHECK
The resistance readings on the winding will be between 5 to 25 ohms. A meter capable of these low readings
must be used. The start relay cover must be removed. (See Figure 7).
If no continuity on start or run winding test, replace gearmotor. If continuity on grounded motor test, replace
gearmotor.
- Installation/Service Manual 1
- UCR 700 SERIES CONTINUOUS 1
- FLOW ICEMAKER 1
- TABLE OF CONTENTS 2
- TABLE OF CONTENTS (cont’d) 3
- SAFETY INFORMATION 4
- 2630460154 5
- GENERAL DESCRIPTION 6
- SPECIFICATION CHART 7
- INSTALLATION 10
- 630460154 12
- GUIDE TO SERVICE 14
- WATER LEVEL CONTROL 15
- REFRIGERATION SYSTEM 16
- CONDENSER MODULATING VALVE 17
- EXPANSION VALVE 17
- BIN CONTROL 18
- GEARMOTOR 19
- MOTOR CHECK 19
- START RELAY 20
- TO REPLACE GEARMOTOR ASSEMBLY 20
- To Replace Bearing 21
- ELECTRICAL CHECKOUT 22
- CAPACITOR CHECK 22
- SAFETY CONTROLS 23
- GUIDE TO GOOD ICE 24
- FIGURE 13. WIRING DIAGRAM 25
- TROUBLESHOOTING 27
- PARTS LIST 28
- FIGURE 14. PANEL COMPONENTS 29
- Part No. Name 29
- IMI CORNELIUS 33
- CERTIFICATE OF WARRANTY 33
- 630460127 34
- IMI CORNELIUS INC 35
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