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860-7200-18 DTU DTB Service & Maintenance Manual
SAFETY RELAY DIAGNOSTIC CHART
CONDITION
INDICATOR
STATUS
POSSIBLE CAUSES OR SOLUTION
Module will not reset
Power LED ON
Fault LED OFF
Ch 1 LED ashing
Ch 2 LED ashing
Waiting for manual reset:
• EDM (External Device Monitoring) contacts not closed� Check PLC
outputs to safety mat reset relay - check relay & connections
• Check jumper at S32 - S33
No fault indicated
Power LED ON
Fault LED OFF
Ch 1 LED OFF
Ch 2 LED OFF
Safety mat appears actuated:
• Check mat for damage or heavy debris
• Check for proper wiring & loose connections
• Check for a short in the wiring
No fault indicated
Power LED ON
Fault LED ON
Ch 1 LED OFF
Ch 2 LED ON
Channel 1 open:
• Check wiring to S11 - S12
• Check connectors are properly seated
No fault indicated
Power LED ON
Fault LED ON
Ch 1 LED ON
Ch 2 LED OFF
Channel 2 open:
• Check wiring to S21 - S22
• Check connectors are properly seated
Fault
Power LED ON
Fault LED ON
Ch 1 LED ON
Ch 2 LED ON
Possible temporary fault:
• Check for loose wiring
• Actuate the mat to clear the fault
• Possible internal fault - replace
Fault All LEDs OFF
Possible fault in the machine control or wiring to the module:
• Check input power connections or external fuses
• Check connectors are properly seated
Fault Dim LEDs
Power LED dim:
• Check power supply capacity and load
Other LEDs dim:
• May glow during power-up (normal)
• Check power supply capacity and load
Fault Fault LED Flickers This is normal while the Fault LED is ON
VFD does not allow
operation of belts
Power LED ON
Fault LED OFF
Ch 1 LED ON
Ch 2 LED ON
Check VFD for faults or an open circuit between VFD and safety relay
• Check continuity of safety outputs (Ie: between terminals 13 & 14)
• Check control wires and connectors
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