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Heidenhain Controller
Drive · Intermediate · 30-120 minutes
HEIDENHAIN 330-0017 - CC inverter for axis RDY=1
The CC2 inverter line module is signaling a not-ready condition (RDY=1) which prevents the TNC from enabling axis drives on this controller. This typically stems from either DC bus voltage problems, missing enable signals, hardware faults in the regenerative unit, or communication issues between the TNC and the Current Controller. The RDY=1 signal is a safety interlock that prevents axis motion until proper line supply conditions are restored.
330-0017
HEIDENHAIN 330-0017 - CC inverter for axis RDY=1
CC inverter for axis RDY=1
The power module is reporting ready status when it should be switched off. This indicates a potential fault in the safety control circuit.
Root Cause Summary
The CC2 inverter line module is signaling a not-ready condition (RDY=1) which prevents the TNC from enabling axis drives on this controller. This typically stems from either DC bus voltage problems, missing enable signals, hardware faults in the regenerative unit, or communication issues between the TNC and the Current Controller. The RDY=1 signal is a safety interlock that prevents axis motion until proper line supply conditions are restored.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access Drive Diagnostics
Press MOD key, select 'System' → 'Diagnose' → 'Drives'. Navigate to CC2 section and observe 'DC Bus Voltage' or 'Intermediate Circuit Voltage' parameter. Normal range is typically 650-750VDC for 3x480VAC input.
Record the actual voltage reading - consistent low voltage indicates input power issues, while overvoltage suggests regenerative path problems.
- 2
Verify Input Line Voltage
Using a calibrated multimeter, measure incoming three-phase voltage at the CC2 inverter input terminals. Verify voltage balance (phase-to-phase deviation should be <2%) and correct voltage level per machine specifications.
Measure only with appropriate CAT III rated test equipment. Lethal voltages present.
- 3
Check Regenerative Resistor Circuit
If equipped with brake resistor (chopper circuit), verify resistor integrity using ohmmeter when power is OFF. Check brake chopper contactor/IGBT operation. Access 'Diagnose Drives' and monitor 'Brake Resistor Active' status during motion.
Overvoltage faults often occur during rapid deceleration if the regenerative path is compromised. Test with reduced feed rates to isolate.
- 4
Inspect DC Bus Capacitors
Visually inspect DC link capacitors on CC2 inverter for bulging, discoloration, or electrolyte leakage. Check capacitor ESR values if test equipment available. Degraded capacitors cause voltage instability and RDY faults.
Capacitors retain lethal voltage after power-off. Wait minimum 10 minutes and verify with voltmeter before contact.
Call a technician if:
- ·CC%2 hardware replacement needed
- ·Complex parameter configuration required
- ·Multiple related alarms present
Prevention
- Regular inspection of servo connections
- Periodic backup of machine parameters
- Monitor servo diagnosis screens during routine maintenance
Common Mistakes
- Ignoring LED status indicators on CC%2 modules
- Changing parameters without proper backup
- Not checking enable signal timing during troubleshooting
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Always verify with your machine manual or a certified technician before performing service procedures.