1569H042 Ed.03
14
COMPRESSOR PROTECTION DELAY
There are three types of delay, selectable by parameter C4, to protect the compressor. These delays prevent
continuous compressor starts and stops due to sudden changes in temperature.
OFF-ON (C4=0): Minimum compressor OFF time before each start-up.
OFF-ON / ON-OFF (C4=1): Minimum time during which the compressor will remain ON and OFF in every cycle.
The delay time is defined by parameter C5.
OPERATION IN CASE OF PROBE 1 FAILURE
In the event of probe 1 failure (fault, disconnection, etc.) compressor performance will depend on C6 settings.
Users may choose between 3 options:
C6=0: The compressor will be stopped until probe 1 is working again.
C6=1: The compressor will be operational until probe 1 is working again.
C6=2: The compressor will operate according to the average performance of the last 24 hours, taking into
account the number of starts and stops and the average time in each state (stop-start).
C6=3: The compressor will run as scheduled in C7 (ON) and C8 (OFF).
SET POINT LOCKING
Using the C2 and C3 parameters, it is possible to set an upper and a lower limit for the Set point (SP), which
precludes configuring a set point that is too low or too high that could damage the installation or the stored
product.
STOP FANS AND COMPRESSOR WHEN THE DOOR IS OPENED
Parameter P23 defines whether the compressor stops when the cold room door is opened. To do so one of the
digital inputs must be configured as "door contact" (P10 or P11=1) (See page 26).
If the door stays open longer than the value programmed in parameter P24, the compressor will return to its
normal operation.
ON ON
OFF-ON (C4=0) OFF-ON / ON-OFF (C4=1)
SP SPSP+C1 SP+C1
C5
C5C5
OFF OFF
COMP.
COMP.
Time
Time
ON
Probe 1 error (If C6=3)
C8 C8C7 C7
OFF
COMP.
Time
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