Cause : Internal fault of sequence control comes when incorrect operating status due to hardware issue in drive control card.

An "incorrect operating status" message on a Siemens Masterdrive can be caused by a variety of issues.

Here's a breakdown to help you diagnose the problem:

1. Active Fault Code: The most likely reason is that the drive has encountered a fault condition and is not operating correctly. This fault could be related to various internal drive issues, motor problems, or external control errors. You'll need to identify the specific fault code to pinpoint the root cause.
2. Incorrect Drive Settings: If the drive parameters are not set appropriately for your application, it might not operate as expected and display this message. This includes settings like motor type, speed limits, current limits, and control modes.
3. External Control System Issues: If an external control system (like a PLC) manages the drive, a malfunction within that system could be sending incorrect commands that lead to the "incorrect operating status" message.