Cause: GEAR OUTPUT GBX ERROR comes when an issue with the gearbox output feedback in a system where a gearbox is being used and monitored. This fault suggests that the drive is detecting an unexpected or incorrect signal from a feedback device (likely an encoder or resolver) that is measuring the output speed or position of the gearbox.

GEAR OUTPUT GBX ERROR fault in Parker AC890 drive indicates an error in the virtual gearbox (GBX) or electronic gearing configuration in your application. This typically occurs when the drive is operating in a mode that involves a gear ratio relationship between a master and slave axis, and something in that configuration becomes invalid or out of sync.

Troubleshooting Steps:

• Verify Gearbox Ratio: The most likely cause is an incorrect gearbox ratio entered into the AC890 drive's parameters.
• Check Drive Parameters: Carefully verify the gearbox ratio parameter in the drive's configuration.
• Wiring Problems: Inspect the wiring between the feedback device on the gearbox output and the drive's feedback input terminals.
• Faulty Feedback Device: The encoder or resolver on the gearbox output might be damaged or malfunctioning, providing an incorrect or no signal.