SCN60
Service
Control System
The control system operates the machine. The controller operates on 12 volts AC, supplied by the transformer. It uses an ultrasonic ice sensor to measure ice level. The ultrasonic system transmits sound waves into the ice storage bin and measures the return time, when the return time is longer than the preset time for bin full, the controller switches the ice machine to an ice making mode. During ice making the compressor, fan motor and auger motor are operating.
The control system has two safeties: It will not operate the machine without water and it will not operate the machine if the auger motor is drawing too much current or if it isn’t drawing any current. The water sensor is checking the conductivity of the water in the water reservoir. If there is no water in the reservoir the conductivity will be zero and the controller will either not start ice making or will stop making ice.
The current or amps of the auger motor are continually monitored by the controller during ice making. If the current is too high, indicating an overload, the controller will stop ice making. If the current is zero, indicating an auger motor failure, the controller will also stop ice making.
The control pad has two switches and three lights. The left switch button is On/Off. The right switch button is Clean/Reset. The left Ice Making light is a status light, it is ON when the machine has been switched to an ice making mode. The center light is a Water light, it will be ON when the controller has sensed that there is no water available. It will go out when the water supply has been restored. The right light is a Time to Clean indicator light. It is switched ON by the controller after six months of power connect time. It will go out after the machine has been cleaned following the process in the Maintenance section.
Glows Green when | Glows Yellow when |
unit is switched On | it's time to clean the |
| machine |
On/Off Control Button | Glows Red when there is no water | Clean Button |
supplied to the machine |
| |
|
|
The machine will NOT make ice when this light is on. It will restart and the light will go out when the water supply is restored.
Control Panel
May 2011
Page 4
