MR ETOS ED - Page 265

9 Visualization
Maschinenfabrik Reinhausen GmbH 2020 2656385142/08 EN ETOS
®
ED
If you are to control a cooling system with the optional Frequency-based
cooling system control [►Section 9.11.7, Page 159] function, you must set
the calculation parameters for both the minimum fan speed and the maxi-
mum fan speed. The device interpolates the values of the parameters be-
tween the two operating points.
1. Go to Settings > Parameters > Active part > Hot-spot.
2. Select the desired parameter.
3. Set the parameter.
4. Press the Accept button to save the modified parameter.
Hot-spot determination
You can use this parameter to set how the device is to determine the hot-
spot temperature. You can select the following options:
▪ Hot-spot measurement
▪ Hot-spot calculation
Calculation method
You can use this parameter to set which method the device is to use to cal-
culate the hot-spot temperature:
▪ IEC60076-7
▪ IEEEStdC57.91
Depending on the calculation method, you have to set various additional cal-
culation parameters.
IEC: hot-spot factor
You can use this parameter to set the hot-spot factor for calculating the hot-
spot temperature in accordance with IEC60076-7.
IEC: gradient
You can use this parameter to set the gradients for calculating the hot-spot
temperature in accordance with IEC60076-7.
IEC: winding exponent
You can use this parameter to set the winding exponents for calculating the
hot-spot temperature in accordance with IEC60076-7.
IEC: oil time constant
You can use this parameter to set the oil time constant for calculating the
hot-spot temperature in accordance with IEC60076-7.