Siemens alarm 22296: [Channel %1: ] Spindle %2 Error on gear stage change (cause: error code %3)

What it means

A gear stage change initiated through the spindle gear-change service (FC18/technology interface) terminated with an error; the detailed cause is given as an error code. It summarizes failures such as timeout, wrong feedback or refusal by the drive during the shift sequence.

Likely causes

• timeout waiting for gear engagement feedback
• gearbox or shift cylinder/pneumatics fault
• spindle speed outside the change window when the shift was commanded
• incorrect error-free state assumption in the PLC sequence