How are parameters set to the internal motor temperature monitoring (I²x t function)?
Answer:
I²x tfunction is not active during default setting C120 = 0 (Time to trip is infinity).
In case of overload the activated I²x t counter will set the failure indication TRIP OC6. With the mains disconnection the memory of the I² x t function is set to 0, therefore the I² x t function offers no motor protection.
In order to avoid a thermal overload of the motor, C0120 can be set as follows:
C0120 = motor rated current / inverter rated current * 100 %
Remark:
The I²xt monitoring is no total motor protection, it is, however, sufficient for many applications (see operating instructions).
