KGL Operating Manual – VS 3010 BS
2018-07-02
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At least one compressor in the respective circuit must be ON (the delay time is reset if no compressor is
running)
Criteria for reset of the alarm
Digital input "fast unload" is active (= alarm status)
Superheat shows measuring loop error >= t0 or suction gas superheat shows a measuring loop error
The alram is reset during start-up of the controller
Configuration
Menu
Parameter
Value
range
Default
Unit
Description
3-3
Min.
Superheat
Z1
2...15
4
K
Threshold for minimum Z1 suction gas superheat for the alarm
signalling (without NT refrigeration points)
Min.
Superheat
Z2
2...15
4
K
Threshold for minimum Z2 suction gas superheat for the alarm
signalling (without NT refrigeration points)
delay min
SH Z1
1...30
10
Minimum Z1 circuit delay time, after
which an alarm will be signalled
delay min
SH Z2
1...30
10
Minimum Z2 circuit delay time, after
which an alarm will be signalled
4.8.8 Monitoring of tc/t0 difference
If the high-pressure drops below the Z1/Z2 LP setpoint, the corresponding Z1/Z2 circuit no longer starts up. A
minimum temperature difference between the tc actual value and the Z1/Z2 t0 setpoints can be configured to
avoid this. If the difference undercuts the specified threshold, the Z1/Z2t0 setpoint is reduced so that the
difference is complied with again.
This results in a compressor start-up in Z1/Z2 that lets the high-pressure increase again. If the temperature
difference exceeds the specified setpoint, the Z1/Z2 t0 setpoint is increased by 1 Kelvin each minute until the
setpoint calculated from the t0 characteristic is reached again.
The temperature difference can be configure in menu 3-3 Verd.Überwach using the parameter Min to diff. The
t0 reduction is deactivated if "--" is entered. The parameter Min to diff is used for the reduction of the setpoints
for both Z1 and Z2.
