10. Other information - Cooling
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– WTS-300-E - V4.1 - 20.01.2022
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10.8 Anti-freezing protection by means of low pressure monitoring
With the WTS-300 "freeze protection" can be set up via the low pressure monitoring
of the compressor. This prevents small quantities of milk from freezing in the tank or
silo.
Two variants are possible:
If there are several compressors, the low-pressure monitor acts on ALL the com-
pressors at the same time.
A) Via an analogue pressure sensor at the analogue 4..20 mA -input
If the pressure falls below a set monitoring pressure [P85], the compressor
is switched off for a time which can be set [P88].
When restarting the compressor, the monitoring is delayed by the set time
[P87].
Other settings: [A54 or A56 or A57] => 2
[P84] => 0
If the fault monitoring of the analogue input [A55] is activated and there is
an error, the anti-freeze protection is temporarily deactivated.
If this function is activated, the current pressure (in %) can be displayed in
the cooling mode by pressing the SET-button.
B) Via a pressure switch on one of the digital inputs
If the pressure switch signals (pressure too low) the compressor is switched
off for a time which can be set [P88].
When restarting the compressor, the monitoring is delayed by the set time
[P87].
Other settings: - P84 = 1 or 2
- The assignment of function 20 (low pressure fault input)
to a digital input [A21..A33].
Time limit for the function "low pressure monitoring"
After activation of cooling the "low pressure monitoring" function can be temporally
limited via parameter [P89].
NOTICE
NOTICE
