231-E006

Access Safety Parameters

Navigate to MOD function → Machine Parameters → Safety Parameters and check MP7300.x series for E-stop configuration settings.

Only qualified personnel should modify safety parameters

Verify Relay Operation

Check the safety relay module in the electrical cabinet. Look for stuck contacts or relay coil failure on the NE2 circuit path.

Use a multimeter to verify relay coil resistance - typical values are 400-2000 ohms depending on relay type

Test Manual Reset

Manually cycle the emergency-stop button and monitor if the safety relay physically switches. Replace relay if contacts remain welded closed.

Ensure machine power is locked out before replacing safety components

Check Input Status

Go to Manual Operation → Diagnosis → I/O Diagnosis and monitor the NE2 input status in real-time during E-stop activation.

The input should show clear state changes between 0 and 1 when E-stop is cycled

Verify Input Wiring

Disconnect NE2 input wire at the TNC terminal and measure voltage directly. If 0V at terminal but TNC shows 24V, input card is faulty.

Use proper ESD precautions when working near TNC input terminals

Isolate Input Channel

If available, temporarily reassign NE2 function to a spare input via MP1020.x parameters to verify if issue follows the signal or stays with hardware.

Document original parameter values before making changes for easy restoration

Trace NE2 Circuit Path

Follow the NE2 wiring from TNC input through all E-stop switches, safety relays, and return path checking for shorts to 24V supply.

Use electrical schematics to identify all series-connected safety devices in the NE2 loop

Insulation Resistance Test

With power off, perform insulation resistance test between NE2 circuit and 24V supply rails using 500V megger. Should read >1 megohm.

Ensure all connected devices can handle 500V test voltage or disconnect sensitive components

Check Junction Boxes

Inspect all junction boxes and terminal blocks in the NE2 circuit for moisture, contamination, or loose connections causing voltage leakage.

Pay special attention to areas exposed to coolant or high humidity which can cause tracking

Review Safety Configuration

Check MP7300.0 through MP7300.9 for emergency-stop configuration. Verify NE2 is properly assigned and test timing parameters are correct.

Default dynamic test timeout is typically 90 seconds, adjustable via MP7300.5

Verify Input Assignment

Confirm MP1020.1 correctly assigns the physical input terminal to NE2 function and matches actual wiring configuration.

Incorrect input assignments can disable safety functions

Reset Safety System

After parameter verification, perform complete safety system reset via MOD → Reset → Safety Reset to reinitialize dynamic test cycle.

Safety reset may require key switch activation depending on MP7300.8 setting