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Door Interrupt System with FYQLA1-140R-3 Logic Amplier
Diagnostics
Faults
The door interrupt system has multiple LEDs mounted on the top of the device to
provide diagnostic and troubleshooting assistance. LEDs are provided for each
switch input pair, indicating the status of the individual channel. Also provided are
output LEDs indicating the status of each of the safety relays. In addition, a fault
LED provides indication of when an input switch error has occurred, resulting in a
fault condition and opening of the safety relay. Fault conditions can be cleared only
upon power down-power up, of the door interrupt system.
Technical support
Troubleshooting
Problem Probable cause Remedy
No LEDs illuminated
No supply power Verify incoming power is present
Blown internal fuse
Verify input power is within spec,
and then replace fuse
Fault LED is ashing
and single LED is lit
for a sensor input
while actuated or
de-actuated
Misaligned sensor and
actuator
Check alignment and realign as
needed
Input screw terminal loose Fully install screw terminal
Defective sensor
See Fault diagnosis (next page)
to help determine problems
Internal failure in door switch
monitor
All inputs activated
(all input LEDs are o)
and the relays do not
activate
Defective unit Replace unit
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