Siemens alarm 22020: [Channel %1: ] Block %3 spindle %2 gear step change position not reached

What it means

While executing a gear change the spindle did not reach the required changeover speed/position window within the monitored time. The gearbox can only shift when the drive holds the spindle inside the narrow change-speed band.

Likely causes

• drive unable to hold the change speed (torque limit, unstable speed loop)
• friction or damage in the gearbox increasing the effort needed to turn the input shaft
• change speed window or monitoring times set incorrectly
• erratic encoder feedback making speed control oscillate

Replacement parts

We supply the following units for this alarm — tested, warranty-backed:

• 1PH7 spindle motor encoder (integral)

  encoder · Check if others ruled out

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