Manitowoc Q130 series, Technician'S Handbook

Page: 109 / 236

Part Number 8001119 10/19 109
Safety Limits
In addition to standard safety controls, the control
board has two built in safety limit controls which
protect the ice machine from major component
failures.
Safety Limit #1: If the freeze time reaches 60
minutes, the control board automatically initiates a
harvest cycle. 3 cycles outside the time limit = 1 hour
Stand-by Mode.
Safety Limit #2: If the harvest time reaches 3.5
minutes, the control board automatically returns the
ice machine to the freeze cycle. 3 cycles outside the
time limit = Safety Limit (must be MANUALLY reset).
Safety Limit Stand-by Mode: The first time a safety
limit shut down occurs, the ice machine turns off for 60
minutes (Stand-by Mode). The ice machine will then
automatically restart to see if the problem reoccurs.
During the Stand-by Mode the harvest light will be
flashing continuously and a safety limit indication can
be viewed. If the same safety limit is reached a second
time (the problem has reoccurred), the ice machine
will initiate a safety limit shut down and remain off until
it is manually restarted. During a safety limit shut down
the harvest light will be flashing continuously.
Determining Which Safety Limit Stopped
the Ice Machine: When a safety limit condition
causes the ice machine to stop, the harvest light on
the control board continually flashes on and off. Use
the following procedures to determine which safety
limit has stopped the ice machine.
1. Move the toggle switch to OFF.
2. Move the toggle switch back to ON.
3. Watch the harvest light. It will flash one or two
times, corresponding to safety limits 1 and 2, to
indicate which safety limit stopped the ice
machine.
After safety limit indication, the ice machine will restart
and run until a safety limit is exceeded again.