Engineering manual - UniSAB III 1.10.8
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001930 en 2021.06
Compressor control and surveillance
But notice that when more than half of the steps are engaged, a higher minimum speed 2 i.e. 700 [rpm]
can be used. Unless a special motor is selected this higher minimum speed is necessary to maintain
proper motor fan cooling at a higher step load than 50%.
For SMC types and a standard setting where minimum speed is set to 500 [rpm], motor rpm min. 2 is set
to 700 [rpm] and maximum speed is 1500 [rpm], the reciprocating compressor will be step/speed regu-
lated up to 47% and then speed regulated between 47% and 100%.
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