KRC0020

Common Causes

• Operator pressed mushroom-head Emergency Stop button on pendant, control panel, or cell perimeter station
• Safety gate or access door interlock switch opened due to personnel entry or mechanical misalignment of gate position sensor
• Light curtain, safety scanner, or area monitoring device triggered by object or person entering defined safety zone
• Broken or disconnected wiring in external E-Stop series chain between multiple stations causing open circuit condition
• External safety relay or contactor (customer-supplied) in the loop de-energized due to power loss or internal coil failure

Troubleshooting Steps

1. 1Step 1: Physically inspect all visible Emergency Stop buttons around the cell to identify which device is mechanically latched in pressed position
2. 2Step 2: Check status of all safety gates and access doors to verify they are fully closed and interlock switches are making proper contact
3. 3Step 3: Review the smartPAD display for specific safety device identifier if system is configured with monitored E-Stop channels showing source location
4. 4Step 4: Reset all latched E-Stop buttons by rotating mushroom heads clockwise and verify safety gate closure then press Acknowledge button on smartPAD
5. 5Step 5: If alarm persists after reset use multimeter to trace 24VDC through external safety circuit measuring voltage drop across each E-Stop station in series
6. 6Step 6: Check external safety relay panel for tripped relays or blown fuses in 24V safety supply and verify enabling switch on smartPAD is functional after full circuit reset