Hello everyone,
As part of an application development, I’m controlling an asynchronous motor without an encoder using an HCS02 drive, reference: R911305034 (R911298374 + R911338543 + R911347141). The motor is operating correctly; I have no issues controlling it.
My problem arises during machine startup. When I power off and restart the machine, the drive automatically sets Second Op Mode 2 to Position control drive controlled. Since there is no encoder feedback, this setting is not suitable, and the drive switches to PM mode.
When I manually force this parameter to 0, the drive exits PM mode, and I’m able to start the machine. However, this setting reappears at every startup, which leads me to believe that the PLC is writing this parameter again.
On the PLC side, I’m using an MLC L75 which communicates with the drive via SERCOS. The program is based on the GAT framework.
Here are my questions:
Does my reasoning seem correct to you? Is it the PLC that is rewriting this parameter at startup?
Where should I look in the PLC program (in the GAT structure) to modify or correct this behavior?
Thanks in advance for your help.
