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Heidenhain Controller
Safety · Intermediate · 30-120 minutes
HEIDENHAIN 330-00BD - CC error in cut-out channel STO.A.x (-STO.B.P.x) axis group A
Alarm 330-00BD indicates a safety-related fault in the STO (Safe Torque Off) cutout channel monitoring system for axis group A. The CC (Control Component) detected that at least one power module is not reporting proper readiness status during the STO channel test sequence, creating a safety interlock condition.
330-00BD
HEIDENHAIN 330-00BD - CC error in cut-out channel STO.A.x (-STO.B.P.x) axis group A
CC error in cut-out channel STO.A.x (-STO.B.P.x) axis group A
The cutout channel test detected a fault in the safety pulse deletion or release circuit. This affects the STO safety function.
Root Cause Summary
Alarm 330-00BD indicates a safety-related fault in the STO (Safe Torque Off) cutout channel monitoring system for axis group A. The CC (Control Component) detected that at least one power module is not reporting proper readiness status during the STO channel test sequence, creating a safety interlock condition.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Check STO relay status in MOD function
Access MOD > DIAGNOSIS > SERVO and check the STO relay status for all axes in group A. Look for RDY signals showing 0 instead of 1.
Use the real-time display to monitor RDY signals during manual STO activation
- 2
Verify external safety circuit continuity
Check external STO contactors and emergency stop chain continuity using multimeter. Measure 24V across STO terminals when system should be ready.
Ensure machine is in safe state before checking safety circuits
- 3
Test STO channel switching
In MOD > DIAGNOSIS > SERVO, manually activate STO test function and observe if both channels A and B switch properly without RDY signal loss.
Call a technician if:
- ·Safety circuit modifications required
- ·CC hardware replacement needed
- ·STO parameter changes affecting safety certification
Prevention
- Regular STO function testing per safety standards
- Monitor servo communication quality monthly
- Keep safety circuit connections clean and tight
- Update CC firmware per Heidenhain recommendations
Common Mistakes
- Bypassing STO circuits for troubleshooting
- Changing safety parameters without proper documentation
- Ignoring intermittent communication warnings
- Not following proper lockout procedures during diagnosis
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