Which products are affected?
9300vector 110…400kW SW ≤ 7.1
What happens?
The PEr trip error message is indicated if the identification run is executed in the V/f characteristic control mode and with activated motor temperature monitoring SD6 (C0594 = 2 or 0).
When does the problem occur?
If the temperature detection is activated via SD6 the current motor temperature is considered when the stator resistance (C0084) is displayed at the end of the identification run. By means of the current motor temperature the stator resistance is calculated under code C0084 based on an ambient temperature of 20 °C. If the 'V/f control' (C0006=5) is selected the temperature is defined with 0 °C during the conversion. As a result, it must be divided by 0 which leads to the PEr trip. If the 'Vector Control' mode is selected (C0006 = 1) the actually detected motor temperature is used. Therefore, an error does not occur.
Possible diagnostics?
If the PEr trip occurs during the identification run check if the V/f characteristic control mode (C0006 = 5) is selected and if the motor temperature monitoring SD6 is activated (C0594 = 2 or 0).
Short-term measures/recommendations?
a) Carry out the identification run in the 'Vector Control' mode and return to the 'V/f control' mode afterwards.
or:
b) Deactivate the monitoring of the temperature sensor via SD6 while the identification run is executed. Re-activate this function when the identification run has been completed.
Evaluation:
This function restriction is detected during commissioning and can easily be avoided by applying the short-term measures mentioned before. Since the identification run does not necessarily have to be executed in case of the V/f characteristic control mode (only required if the inverter error compensation is to be determined) this function restriction appears rather seldom.
