9 Visualization
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Alternating mode: Change interval
You can use this parameter to set the time period after which the cooling
stage is to be changed.
9.10.7 Configuring the frequency-based cooling system control
The optional frequency-based cooling system control function lets you con-
trol the fans in a cooling system using the frequency. The device calculates
the fan speed based on the temperature of the top-oil and the load factor.
The device uses the highest speed derived based on the configured depen-
dencies.
The device outputs the fan speed as an analog signal (0...10 V), using in-
verse logic in the process: 100% = 0 V, 0% = 10 V. The device records the
status of the connected frequency converter using inverse logic (low active).
Fan speed based on the 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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