axismd.ai
Heidenhain Controller
Drive · Intermediate · 30-120 minutes
HEIDENHAIN 231-A001 - A001 Cancelation of brake-test call monitoring
HEIDENHAIN alarm 231-A001 occurs when the automatic brake test sequence is interrupted or cannot complete properly. This typically happens when safety doors are opened during the brake test or when drive enable signals are lost during the monitoring phase.
231-A001
HEIDENHAIN 231-A001 - A001 Cancelation of brake-test call monitoring
A001 Cancelation of brake-test call monitoring
This TNC 640 error relates to the motor brake system. The control has detected an issue with brake operation or testing.
Root Cause Summary
HEIDENHAIN alarm 231-A001 occurs when the automatic brake test sequence is interrupted or cannot complete properly. This typically happens when safety doors are opened during the brake test or when drive enable signals are lost during the monitoring phase.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Check door status indicators
Navigate to MOD > Machine Parameters > Safety and verify all door status signals show closed (typically parameters 128200-128207).
Never bypass safety door switches during brake testing
- 2
Verify door switch functionality
Test each protective door switch by opening/closing doors while monitoring PLC inputs in the diagnostic screen.
Use PLC > Inputs/Outputs to monitor door switch states in real-time
- 3
Restart brake test sequence
Ensure all doors are properly closed, then restart the brake test from Setup > Spindle/Axis > Brake Test menu.
Wait for all door status LEDs to show green before initiating test
Call a technician if:
- ·Drive hardware faults persist after parameter checks
- ·Custom PLC modifications require analysis
- ·Mechanical brake components show wear or damage
Prevention
- Schedule regular brake test cycles during maintenance windows
- Keep protective doors closed during all automatic test sequences
- Monitor drive system health indicators regularly
- Maintain proper brake test parameter documentation
Common Mistakes
- Opening doors during brake test thinking it's safe to interrupt
- Ignoring drive ready status before starting test
- Modifying brake test parameters without understanding safety implications
- Not allowing sufficient time for drive system stabilization
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
Get machine-aware diagnosis
AxisMD logs alarms against your actual machines, tracks patterns, and gives AI context your manual doesn't have.
Start freeWas this guide helpful?
Always verify with your machine manual or a certified technician before performing service procedures.