Product manual

U7698E Flame Detector
18
Part 334614E
E 2002 Nordson Corporation
Manual 34-49
Troubleshooting Chart
Use the following chart to isolate and correct problems with the flame
detector.
Problem
Possible Cause Corrective Action
1. Detector fault Through-the-lens test failed Make sure the detector lens is clean.
If powder is accumulating on the
lenses, check the air supply to the air
shields. Reset the detector head if
the fault continues.
Detector head lost power, or
sensor or electronics module
malfunctioned
Check the red detector head LEDs.
When operating normally, the LEDs
should blink every 5 seconds.
If the LEDs are not blinking, check
the wiring between the indicator
panel and the detector. There should
be 24 Vdc between pins 1 and 2 at
the detector.
S If 24 Vdc is present, make sure
the electronics module is securely
connected to the connector board
and that the connector board
harness is connected to the
sensor module. If all connections
are secure, replace the
electronics module.
S If 24 Vdc is not present, make
sure green POWER ON indicator
on the indicator panel is on. If the
indicator panel has power, repair
or replace the wiring between
controller and detector.
2. No power (green
POWER ON indicator
on indicator panel is
off)
Blown fuse in indicator panel Check the fuses on the terminal
block. Replace if necessary with 2A
fuses.
Faulty wiring to booth electrical
panel
See Figure 6. Check for the correct
voltage at the L1 and L2 terminals on
the indicator panel terminal block. If
the correct voltage is present, refer to
next Possible Cause. If the correct
voltage is not present, repair or
replace the supply wiring.
Indicator panel dc power supply
failed
Check for 24 Vdc at terminals 1040
and DCCOM on the indicator panel
terminal block. If 24 Vdc is not
present, replace the power supply.