Eliminated from:
8400 StateLine V11.00
8400 HighLine V11.00
8400 TopLine V02.00
Behaviour of the new version?
The identified parameters are saved correctly in the parameter set after identification. The parameters are available as expected after saving and mains switching when the device is restarted.
Which products are affected?
8400 StateLine ≤ V06.xx / V10.xx large-power devices only (30 / 37 / 45 kW)
8400 HighLine ≤ V06.xx / V10.xx large-power devices only (30 / 37 / 45 kW)
8400 TopLine ≤ V01.xx large-power devices only (30 / 37 / 45 kW)
What happens?
The motor parameters which have been saved with mains failure protection after they have been identified via motor parameter identification are not initialised correctly after re-connecting the mains. Compared to the behaviour before mains switching, the drive performance has changed considerably.
When does the problem occur?
The problem occurs in following cases:
- After initialisation of the motor parameters based on the code values saved when connecting the mains and also if
- the codes of the motor parameters are rewritten with the same values after successful motor parameter identification without mains switching.
The behaviour is caused by a wrong factor when the code values are converted into variable values used inside the device.
Applications with synchronous motors (SM, PSM) and asynchronous motors are affected, irrespective of the motor parameter identification procedures (simple or extended) used.
Possible diagnostics?
The drive performance after mains switching differs strongly from the phase directly after the motor parameter identification without meanwhile mains switching.
Short-term measures/recommendations?
1. Execute the motor parameter identification after every mains connection.
2. Or adapt the code values of the motor parameters mentioned below after successful motor parameter identification:
- C0084 Stator resistance
- C0082 Rotor resistance (only with asynchronous motors)
- C0085 Leakage field magnetising inductance
- C0092 Main field magnetising inductance (only with asynchronous motors)
In order to do so, read out the codes from the drive controller, multiply them with the conversion factor mentioned below, retransfer them to the 8400 or enter them into the Engineer before saving them with mains failure protection.
Formula: (Parameter_corrected) = (Conversion factor) * (Parameter_identified)
Conversion:
- 30 kW device: 0.1322
- 37 kW device: 0.2889
- 45 kW device: 0.4247
Evaluation:
As soon as the conversion of the 4 code values has been executed once as described above the motors can be used permanently and without problems with the firmware versions affected.
Search terms: drive performance, drive behaviour, smooth running
