Figure 11: Sensor Calculation By Excel - KEB COMBIVERT F6 Programming Manual

Protection functions
to calculate the temperature values that must be entered in subindex 1
1) to subindex 32
If the defined characteristic range is left, the display of the motor temperature in
ru28 remains set at the final values of the characteristic
value 32, until the resistance value
to "short circuit") or the resistance value
changes to "no connection").
The calculated resistance value of the temperature sensor is displayed in subindex
37 actual calculated
nition.
The series resistor of the evaluation circuit is displayed in subindex 38 Rv, since
the inverter does not provide a constant current source. This allows the user to es-
timate if self-heating of the sensor can falsify the measurement.
The following values must be defined for the calculation of the setting of
the EXCEL file:
1 Resistance limits
2 Sensor characteristic (e.g. from data sheet for required measuring range)
21
1

Figure 11: Sensor calculation by Excel

CAUTION
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(temp value 32) .
short circuit level
no connection level
resistance. By way the user can check the characteristic defi-
1fghfh
➢ Since not all sensor characteristic curves can be emulated by a cor-
responding trend line, it must be checked whether the trend line
mapps the characteristic curve with sufficient accuracy.
(temp value
(temp value 1 or temp
falls below (display changes
is exceeded (display
dr30 by
67