Corrected from:
- Servo Inverter 9400 HighLine with firmware version >= 14.08.00
- Servo Inverter 9400 Servo PLC with firmware version >= 08.08.00
Response of the new version:
The speed limitation value for the brake test amounts to 87.5% of the value of C11. In this way, no speed controller error occurs during the brake test with the default parameter setting of C576 (100% of C11).
What happens?
During the brake test (function of LS_Brake), the monitoring function of the speed controller error responds (actual speed value outside tolerance range (C00576) [0x007b0012]).
When does this behaviour occur?
The behaviour occurs during the brake test if the MCK sends a setpoint of 100% (C11) to the speed controller.
The monitoring threshold is 100%. According to the control process with actual speed values which may also be slightly lower than 0rpm, from time to time, the setpoint also increases to values higher than 100%. In this case, the monitoring function will respond.
Which products are affected?
Servo Inverter 9400 HighLine with firmware version ≤ 12.00.18.00
Servo Inverter 9400 Servo PLC with firmware version ≤ 06.00.18.00
Possible diagnostics:
Set C579 to 'Warning' and compare the error number in the application with 2759524370. After this, the brake test will be completed as expected. From the oscilloscope records of the speed setpoint and the actual speed value you can see that the difference between setpoint and actual value sometimes exceeds the limit of 100%.
Short-term measures:
Temporary remedy: Set C579 to 'Warning' and compare the error number in the application with 2759524370. This comparison may only lead to an error if BRK_bBrakeTest=FALSE. This can be implemented by means of an application error.
The monitoring threshold (C576) can only be set to a maximum of 100%.
Evaluation/recommendations:
· In applications requiring cyclic brake tests, the monitoring function cannot be used efficiently.
· In the Lenze setting, the monitoring function for the speed controller error is set to 'No response'. The monitoring function is only used in a small number of applications.
· The behaviour can be explained and occurs in every brake test.
