What causes Siemens SINUMERIK alarm 22000?

A gear stage change for the spindle will not be possible, if: - thread cutting (G33, G34, G35) is active - the spindle is active as master or slave spindle in a coupling - the spindle is being positioned.

How do I fix Siemens SINUMERIK alarm 22000?

1. The gear stage is to be set prior to the corresponding machining step. 2. If it is necessary, however, to change the gear stage within one of the above mentioned functions, this function must be switched off for the time of the gear stage change. 3. Thread cutting is deselected with G1; synchronous spindle coupling is switched off with COUPOF; the spindle positioning operation is exited with M3, M4 or M5. 4. Clear alarm with the RESET key. Restart part program

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Siemens SINUMERIK Controller

Spindle · Intermediate · 20-45 minutes

Alarm 22000

Siemens 22000 - Block Spindle Gear stage change in not possible

ALARM 22000 triggers when a gear stage change is commanded on a SINUMERIK 840D spindle while thread cutting (G33/G34/G35), spindle coupling (master/slave synchronization), or spindle positioning is active. The NCK blocks gear stage transitions until these conflicting spindle states are cleared to prevent loss of synchronization or thread pitch integrity.

Siemens SINUMERIKSpindleIntermediate20-45 minutes

22000

Siemens 22000 - Block Spindle Gear stage change in not possible

Block Spindle Gear stage change in not possible

Root Cause Summary

ALARM 22000 triggers when a gear stage change is commanded on a SINUMERIK 840D spindle while thread cutting (G33/G34/G35), spindle coupling (master/slave synchronization), or spindle positioning is active. The NCK blocks gear stage transitions until these conflicting spindle states are cleared to prevent loss of synchronization or thread pitch integrity.

Safety

Spindle hazard: ensure the spindle is at standstill before working near it; follow lockout/tagout procedures.

Causes and Fixes

1
Review NC program logic: confirm G33/G34/G35 is complete before issuing GEAR or M163/M164 (gear change commands). Check MD34020 'SpindleGearChangeTime' to ensure adequate dwell after threading blocks.
Do NOT issue GEAR command while G33/G34/G35 is active in the current or lookahead blocks.
2
Monitor Diagnostics > NCK > Spindle Actual Values to verify spindle speed has stabilized post-threading (check S-parameter request vs. actual speed match within MD32090 'SpindleSpeedTolerance' window).
3
Insert explicit G00 or G01 dwell (G04 P500) after threading block to allow NCK to deactivate thread-coupling mode before GEAR command execution.

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