Manitowoc CVD0675, Technician Manual

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Electrical System
COMPONENT SPECIFICATIONS AND
DIAGNOSTICS CONTROL BOARD
All QuietQube
®
control boards incorporate the
following features. Refer to “Sequence of Operation”
for additional information specific to your model.
Harvest/Safety Limit Light
This light’s primary function is to be on as water
contacts the ice thickness probe during the Freeze
cycle, and remain on throughout the entire Harvest
cycle. The light will flicker as water splashes on the
probes. The light’s secondary function is to
continuously flash when the ice machine is shut off on
a safety limit, and to indicate which safety limit shut off
the ice machine.
Freeze Time Lock-In Feature
The ice machine control system incorporates a freeze
time lock-in feature. This prevents the ice machine
from short cycling in and out of Harvest.
The control board locks the ice machine in the Freeze
cycle for six minutes. If water contacts the ice
thickness probe during these six minutes, the Harvest
light will come on (to indicate that water is in contact
with the probe), but the ice machine will stay in the
Freeze cycle. After the six minutes are up, a Harvest
cycle is initiated.
To allow the service technician to initiate a Harvest
cycle without delay, this feature is not used on the first
cycle after moving the toggle switch OFF and back to
ICE.
Maximum Freeze Time
The control system includes a built-in safety that will
automatically cycle the ice machine into Harvest after
60 minutes in the Freeze cycle.
Safety Limits
There are two safety limits that protect the ice machine
if the Freeze or Harvest cycles are outside of their
guidelines.