14
Systems, Controls and Operations
Model C602
Freezer Lock-Out
Heat Cycle Failure Messages
To comply with health codes, heat treatment system
freezers must complete a heat treatment cycle
daily, and must be disassembled and brush cleaned
a minimum of every 14 days. Brush cleaning is the
normal disassembly and cleaning procedure found in
the Operator Manual. Failure to follow these
guidelines will cause the control to lock the freezer
out of the AUTO mode.
Always comply with local guidelines for the
maximum number of days allowed between brush
clean cycles. (See the Manager/Service Menu for
setting the Brush Clean interval, on page 21.)
If the Heat Treatment Cycle fails, the VFD will
display a failure message and return the freezer to
the STANDBY mode. A “lock” is defined as a special
STANDBY mode of operation which does not allow
the machine to operate in the AUTO mode.
There are two types of freezer lock conditions that
can occur: Hard Lock or Soft Lock. A Hard Lock
requires the machine be disassembled and brush
cleaned. A Soft Lock can be corrected by either
disassembling and brush cleaning the machine, or
by starting another heat treatment cycle.
Hard Lock: There are two causes of a hard lock
failure:
1. The brush clean timer has elapsed (maximum
setting of 14 days). (See Figure 11.)
BRUSH CLEAN TIMEOUT
FREEZER LOCKED
CLEANING REQ’D
WASH TO BRUSH CLEAN
Figure 11
Selecting the WASH symbol
will display the
following screen. (See Figure 12.)
FREEZER LOCKED
Figure 12
2. There has been a thermistor failure (freezing
cylinder, hopper, or glycol) during the heat
treatment process. (See Figure 13.)
SYSTEM FAULT
FREEZER LOCKED
SERVICE REQ’D
< PRESS TO CLEAR
Figure 13
Selecting the CALIBRATE symbol
will indicate
which thermistor caused the Hard Lock. (See
Figure 14.)
L: HOPPER THERM BAD
FREEZER LOCKED
Figure 14
If the machine has hard locked and an attempt is
made to enter AUTO, the machine will enter the
STANDBY mode and display the following message.
(See Figure 15.)
FREEZER LOCKED
Figure 15
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