SCN60
Service
Electrical Sequence
Upon power being supplied, all the lights will blink once and the control system will immediately check for water in the reservoir. If there is water no further action will occur until the On/Off button is pushed.
Pushing the On/Off button starts the machine. The Ice Making light will switch on. The auger motor, compressor and fan will begin to operate. Those three components will continue to operate until the Ice Level Control detects that ice has built up to the
After sixty seconds the auger motor will shut off. The purpose of this is to remove any ice from the evaporator so the auger motor can restart with minimal load.
The machine will restart after the ice level has fallen one inch or more.
Other Control Functions:
To Shut Off: Push and release the On/Off button. If the machine was off because the bin was full, the unit will be switched to Off immediately. If the unit was making ice, the compressor and fan motor will shut off immediately, and the auger motor shut off in sixty seconds. To shut the unit off immediately while making ice, push and HOLD the On/Off button until it shuts off.
To Clean: See Maintenance section for step by step process. Pushing the Clean button while the Ice Making light is On does not start the clean cycle, it is only active from Off. Pushing the Clean button from Unit Off starts the clean cycle:
•Time to Clean light flashes
•Auger motor operates for twenty minutes
•Auger motor and compressor operate for twenty additional minutes
•Unit shuts off, Time to Clean reminder light switches Off.
Safety Shut Downs:
Lack of water. It is critical that the unit not operate without a full charge of water. The water sensor in the reservoir is used to check continuity through
the water it is in contact with. If there is no water present, there will be no electrical continuity and the control system will stop the machine and cause the Check Water light to blink Red, alerting the user of a lack of water. When water has returned to the reservoir, the unit will automatically restart.
Power interruptions: If the power to the machine failed during normal operation, the machine will automatically restart after a two minute delay. If the unit had shut down because of a safety, then the unit remains in the shut down state.
Auger motor overload: If the auger motor current exceeds the preset limit for a certain time, the controller will shut the compressor and auger motor off. The controller will keep the compressor and auger motor off for four minutes, then restart them. The controller records each overload as a strike. It will erase the strike(s) if the current draw in the sixty seconds following the restart is below the preset limit. If within the sixty seconds after the restart the current again exceeds the limit, the controller again shuts the machine down and a second strike is recorded and four minutes later a second restart occurs. If the current is again excessive the third time, the unit will stop restarting and the lights will flash on and off every two seconds.
Auger motor low current: If the controller senses the auger motor is not drawing any or minimal current, it will shut the compressor and auger motor down for twenty minutes before attempting a restart. The twenty minutes are intended as time for the auger motor to cool off if it has shut down on its internal overload. The controller records that as a strike. If in the next sixty seconds the auger motor begins to draw current the strike is erased and normal operation resumes. If the current is still low, a second strike is recorded and the unit will wait another twenty minutes before attempting a third restart. If the third restart is normal, the strikes are erased and normal operation is continued. If the unit fails again, the unit will stop restarting and the lights will flash twice on and off every two seconds.
Controller Failure: If all lights are flashing once every 10 seconds the controller has identified an internal failure and must be replaced.
May 2011
Page 8
