7 Operation
Maschinenfabrik Reinhausen GmbH 2019 1995163667/06 EN ETOS
®
IM
Figure147: Frequency-based cooling system control
The device outputs the fan speed as an analog signal (0...10 V) and uses
inverse logic in the process: 100% = 0 V, 0% = 10 V. The device records
the status of the cooling stages using inverse logic (low active).
Fan speed based on top-oil temperature
If the top-oil temperature is less than the lower threshold, then the device
uses the minimum fan speed. If the top-oil temperature is greater than the
upper threshold, then the device uses the maximum fan speed. If the top-oil
temperature is between the lower threshold and upper threshold, then the
device calculates the necessary speed using a straight line between both
points S1 and S2.
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