4.4.5.2 KTY / PT1000 evaluation
Values of ru28 motor temperature when using a KTY or PT1000 sensor:
"Short circuit" is displayed when the resistance is too low and "no connection" is
displayed when the resistance is too high.
4.4.5.3 Free-programmable sensor
If the used motor temperature sensor is an unknown sensor type for the inverter,
the user can specify his own characteristic with dr30.
In order to activate this characteristic, value 5: user definition must be set in dr33
motor temp sensor typ.
user drive temp.
sensor def.
Parameter structure for the definition of a customer-specific
characteristic for detection of the motor temperature
temp value1
…
temp value 32
32 temperature values to define the application-specific re-
sistance characteristic of the motor temperature sensor.
Presetting in °C
Minimum resistance value of the sensor characteristic (in ohm)
=> resistance, which belongs to the temperature preset in temp
value 1
Maximum resistance value of the sensor characteristic (in ohm)
=> resistance, which belongs to the temperature preset in temp
value 32
Resistance value (in ohm) which displays "short circuit" in ru28
Resistance in ohm which displays "no connection" in ru28
act. calculated
resistance
Actual calculated resistance of the sensor
Display of the series resistor of the evaluation circuit (to calcu-
late the sensor current: voltage of the measuring circuit approx.
4.7V, here series resistor 1K91 Ohm).
The user-specific characteristic is defined with sub indices 1 to 34. It consists of 32
pairs of values: resistance value of the sensor and associated temperature.
The internal table of the resistance values range from R min (subindex 33) to R
max (subindex 34) in 32 equidistant steps.
The corresponding temperatures can be calculated with an EXCEL table if the sen-
sor characteristic can be mapped by the trend line. The trend line function is used
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