Honeywell SYA14 Series Manual page 385

Inspection and Maintenance
Light on
Possible incidents in the Automatic mode
Symptoms
Emitter
Light on
38 Honeywell • MICRO SWITCH Sensing and Control
The emission frequencies of
the emitter and the receiver
are different
Beam occultation
Unacceptable high voltage
line transients (over the IEC
801-4 specified level)
The equipment operate
correctly with random
false detections
Unacceptable light
interference (over the
product allowance)
The equipment operate
correctly with random
false detections
Light off
Receiver
The equipment is detecting a failure or
the receiver receives a signal from two
emitters with the same emission
frequency
Light off
FF-SPS4 Series Installation Manual
Select an identical emission frequency F1 or F2
on both emitter and receiver
Remove the detected object from the sensing
area
Check:
• Presence of RC components or varistors on
inductive loads
• Quality of the power supply
• Earth connections
• Quality of connections of the test input and
the FSD monitoring input (cables should be
installed away from any high power cables)
Check:
• Protect the receiver unit against direct
exposure to an external infrared light source
or
• Select a different emission frequency F1 or
F2 if several equipments are used in the
same area
Flickering light
Causes Corrective actions
• Check connections on the Final
Switching Devices monitoring loop
or
• Change the emission frequency of
the second emitter and switch off
and on the power of the receiver
Flickering light
For application help: call 1-800-537-6945