Manual

TM 40/40R, Rev (4) November 2010
Troubleshooting 37
4.2 Troubleshooting
This section is intended to be a guide to correct problems which may happen
during normal operation.
Table 19: Troubleshooting Table
Problem Cause Corrective Action
LEDs Off
Fault Relay at N.O
0-20mA at 0mA
No power at the
unit
•
Check that the correct power
is sent to the detector.
•
Check power polarity.
• Check wiring in the detector.
•
Send the detector back for
repairs.
Yellow LED flashes
at 4 Hz
Fault Relay at N.O
0-20mA at 0mA
Fault Detector
• Low Voltage
•
Faulty Detector
•
Check the voltage at the
detector; verify at least 24V
at the detector terminal.
• Send the detector back for
repairs.
Yellow LED flashes
at 4 Hz
Fault Relay at N.O
0-20mA at 2mA
BIT Fault
• Faulty Detector
•
Clean detector window.
• Re-power the detector.
•
Replace the detector.
Red LED
constantly on
If no fire exists,
then, detector
alarm latched
Perform Reset to the detector.
Alarm Relay at On
0-20mA at 20mA
Alarm condition
•
Check cause for alarm.
• If no alarm, re-power the
detector.
• Send the detector back for
repairs.