231-A8D0

Check emergency stop status

Navigate to MOD > Safety > Safety Status and verify all emergency stop inputs show 'OK' status in the safety monitoring display.

Never bypass safety circuits - always identify root cause first

Reset emergency stop chain

Physically reset all E-stop buttons by pulling/twisting to release, then check safety relay status in PLC diagnostics.

Check for stuck E-stop buttons that appear reset but don't make proper contact

Acknowledge safety system

Press the safety acknowledgment button (typically F8 in safety menu) after confirming all safety devices are properly reset.

Some systems require a specific sequence: Reset hardware first, then software acknowledgment

Verify SS1 completion

Monitor the safety status display to confirm SS1 state changes from 'ACTIVE' to 'READY' before attempting drive enable.

SS1 completion requires both motion stop AND safety circuit continuity

Check door switch status

Access MOD > Safety > Input Status and verify all door switches show 'CLOSED' status. Look for any switches showing 'OPEN' or 'FAULT'.

Magnetic switches can fail internally while appearing physically closed

Test door switch operation

Open and close each safety door while monitoring the input status display to verify proper switching action and timing.

Only qualified personnel should test safety switches with guards removed

Inspect switch alignment

Check physical alignment of magnetic or mechanical safety switches, ensuring proper gap (typically 2-5mm for magnetic types).

Worn door hinges can cause switch misalignment over time

Verify wiring continuity

Use multimeter to check continuity of safety switch wiring from switch to safety relay input terminals.

Safety switches often use dual-channel wiring - both channels must be functional

Check SKERN-CC status

Navigate to MOD > System > Safety Kernel Status and verify SKERN-CC shows 'OPERATIONAL' without any fault flags.

SKERN-CC faults often appear as hexadecimal error codes in this display

Perform safety system restart

Execute controlled shutdown via MOD > System > Shutdown, wait 30 seconds, then restart to reinitialize SKERN-CC safety software.

Ensure all motion is stopped and workpiece is secure before shutdown

Monitor startup sequence

During restart, watch the safety status display for proper SS1 initialization sequence and timing.

SKERN-CC typically takes 15-20 seconds to fully initialize safety monitoring

Verify safety parameters

Check MOD > Safety > Parameters for any SS1 timing parameters that may need adjustment per machine documentation.

SS1 stop time parameters must match actual machine deceleration capabilities

Check drive status

Access MOD > Diagnosis > Drive Status and verify all axes show 'READY' status without fault codes.

Look specifically for encoder or feedback-related fault codes

Verify position feedback

Monitor actual position values in MOD > Position > Actual Position to confirm all axes are stationary and providing stable feedback.

Unstable position feedback often indicates encoder or cable issues

Clear drive faults

Use the drive reset function in MOD > Manual > Drive Reset to clear any latched drive faults that may prevent SS1 completion.

Only reset drives after confirming the fault cause has been addressed

Test individual axis motion

In manual mode, test each axis individually at low speed to verify proper drive operation and feedback before enabling full system.

Start with very small incremental moves (0.1mm) to test feedback stability

Check safety relay status

Inspect safety relay LED indicators and verify proper state indication. Check for any fault LEDs on safety relay modules.

Safety relays often have multiple status LEDs for different safety functions

Measure relay contacts

Use multimeter to verify safety relay auxiliary contacts are providing proper feedback signals to the control system.

De-energize circuits before measuring contact resistance

Test relay operation

Cycle the safety system and observe relay operation timing and contact switching using the safety status display.

Safety relays have specific timing requirements - check against manufacturer specifications

Verify power supply

Check 24VDC power supply voltage to safety relays and confirm stable voltage under load conditions.

Voltage drops under load can cause intermittent safety relay operation