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Heidenhain Controller
Servo/Axis · Intermediate · 30-120 minutes
HEIDENHAIN 231-9330 - 9330 Incorrect position encoder input configured
Alarm 231-9330 occurs when the TNC control attempts to reference a position encoder input that is not physically present or properly configured in the machine parameters. This typically happens after parameter changes, hardware modifications, or when encoder configuration parameters reference non-existent encoder inputs.
231-9330
HEIDENHAIN 231-9330 - 9330 Incorrect position encoder input configured
9330 Incorrect position encoder input configured
This TNC 640 error indicates an encoder-related issue for axis. The control has detected abnormal conditions in the position or speed feedback system.
Root Cause Summary
Alarm 231-9330 occurs when the TNC control attempts to reference a position encoder input that is not physically present or properly configured in the machine parameters. This typically happens after parameter changes, hardware modifications, or when encoder configuration parameters reference non-existent encoder inputs.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access machine parameters
Press MOD key, select 'Machine Parameters' from the operating mode menu, enter password if required.
Backup machine parameters before making any changes
- 2
Check encoder input parameters
Navigate to MP6210 (Position encoder input) and verify the configured input number matches available hardware inputs on your TNC control.
Check the control's hardware documentation to confirm available encoder inputs
- 3
Verify axis assignment parameters
Check MP1010 (Assignment of axes to encoder inputs) to ensure all referenced encoder inputs exist on the control hardware.
- 4
Correct invalid parameters
Change any encoder input parameters that reference non-existent inputs to valid input numbers, then perform a control restart.
Call a technician if:
- ·Hardware encoder module replacement required
- ·Parameter corruption persists after multiple restoration attempts
- ·Uncertainty about correct encoder input configuration for specific machine
Prevention
- Always backup machine parameters before making changes
- Document encoder input assignments for your specific machine
- Verify hardware compatibility before parameter transfers
- Perform regular parameter backup maintenance
Common Mistakes
- Assuming encoder input numbers are the same across different TNC control models
- Not verifying available hardware inputs before parameter changes
- Restoring parameters from incompatible control versions
- Forgetting to restart control after parameter changes
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