Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
153/346
Compressor control and surveillance
3.8.5 Built-in spacer block
If the compressor has a built-in spacer block and automatic Vi regulation, the mechanical zero must be
set to Yes. This will reduce the travel of the capacity slide by the percentage value [0-40%] entered in
Manual zero and the corrected capacity can be calculated and shown correctly.
The value [0-40%] that must be entered in Manual zero must have the following size:
Set the Mechanical zero in the picture Setup/Configuration/Compressor Block in the configuration point:
Mechanical zero [No/Yes]
Manual zero 0.0%
The position transmitter is calibrated with the spacer block mounted and the Vi-slide in minimum (0%).
3.8.6 Capacity error shutdown
If the slide cannot reach the position corresponding to a calculated or set zero point (a positive read ca-
pacity) before the expiry of the timer T
cap. neg.
, the compressor will be stopped with the alarm Capacity
error.
The timer T
cap.neg.
is counting down every second by a factor between 1 and 90 depending on the read
negative capacity. Each time the slide moves above 0% read capacity, the timer will be stopped. The
timer is reset (set to the reset value) and is restarted once the slide moves below -2% capacity.
The timer is set in the picture Setup/Timers/Timer setup in the timer Cap.Neg.
The reset value can be set in the interval of 60-20,000. The factory value is 5000. It is very important that
the timer has been set correctly. A value too low will result in the Capacity error shutdown. A value too
high will make the compressor run with a negative capacity for too long.
manual zero =
length of spacer block
length of total capacity level
100%
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