Corrected from:
Inverter Drive 8400 TopLine from V16.00.00
Response of the new version:
Encoders with an optional number of increments can be used.
What happens?
Several drive revolutions in one direction lead to a position drift.
As a consequence, the pole position "runs away" when using synchronous motors.
This leads to an increased current requirement due to a reduced torque, up to a standstill of the motor at full current or an overspeed of the motor.
When does this behaviour occur?
If a sin/cos encoder with a number of increments other than 2^x is used, the position is not integrated correctly.
Which products are affected?
Inverter Drive 8400 TopLine
Short-term measures:
Use an encoder with a number of increments of 2^x.
If necessary, the evaluation can be temporarily set to TTL encoder.
Evaluation/recommendations:
The maloperation should be noticed during commissioning.
