Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
139/346
Compressor control and surveillance
• Max. slide
• At bal. cap.
This function is connected to a digital output. See wiring diagrams.
Explanation
• Ready
If selecting this function, the output will be activated when the compressor is ready for operation
in Remote/Auto. This means that Auto start has been configured (and Auto stop), external start-
ing permission - normal stop has been set. There are no alarms and the compressor can start.
• At min. cap.
If selecting this function, the output will be activated when the compressor is below Signal low
which is set in the same menu Configuration/Aux Output. The hysteresis is 1%.
• At max. cap. Select this function and the output is activated when the compressor is above Sig-
nal high which is set in the same menu Configuration/Aux Output. The hysteresis is 1%.
Please note that the line Signal low or Signal high is not included in the menu until the auxiliary
output has been selected as either At min. cap. or as At max. cap.
• Running
If selecting this function, the output will be activated whenever the compressor is operating, i.e.
when the start signal to the compressor has been set.
• Ready ext.
This function corresponds to the Ready function, but here it is not required that external starting
permission - normal stop is set for the output to be activated. The function works both in Remote
and Auto.
• Ready/me only
This function means that the compressor is ready, that it has the lowest start number and that it
is the only compressor in operation on this system. The output can be used to ensure constant
water circulation by the PT 100 sensor whenever a compressor is ready to start.
• Running at max. cap.
Select this function to activate the output when the compressor is running at the maximum pos-
sible capacity, i.e. on one of the following conditions:
• The compressor is running at max. capacity i.e. above Signal high = 100%, where signal
high is set in the same menu Configuration/Aux Output. The hysteresis is 1%.
• A capacity limiter is active, i.e. the compressor is running in one of the following three
limiting status:
– Overload (current)
– Discharge (overload)
– Suction (overload)
When a capacity limiter is active it will prevent the compressor from reaching 100%.
Note: The output may be deactivated from the time when the limiter is no longer active and
until the compressor again reaches 100% capacity.
• Max. cap. pos.
When selecting this function, the output will be activated when the absolute travel of the capacity
slide position, Capacity slide position [%] > Signal high [%].
The hysteresis between active and inactive signal is 1%. Please note that the line Signal high is
not included in the menu until the auxiliary output has been selected as Max cap. pos.
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