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Idiomas disponibles
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6.1 Errors signalled by LED
The LED fitted to the terminal PCB can help identify faults. Its position is shown on Diagram
7 on page 11. The table below shows how to interpret what is wrong for each pattern
of flashes.
LED Pattern
Regular flash each second.
On with short blips off.
Fast flash on and off or
irregular flash pattern.
Permanently on.
Two long flashes followed
by a short flash.
Fast double flash each
second.
Short blip each second.
Any other faults can only be rectified by returning the IRmax to Crowcon or authorised
service agent.
6.2 Analogue Output
IRmax will remain in Fault state and "Service required" will also be shown on the
IR Display (if fitted) if the analogue output signal has failed or is not connected to a
control system or load resistor. IRmax actively monitors the 4-20mA analogue output
signal to verify it is in range. If the signal is out of range the detector will go into fault
and the output will be set to 1mA. Thus, when testing a detector it is essential that it is
either connected to a control panel or a 100Ω load resistor is connected between the '0V'
and 'Sig' terminals (detector set to 'Source' mode) or between the '0V' and '+V' terminals
(detector set to 'Sink' mode).
Detecting Gas Saving Lives
Detector Status
Action
Healthy.
Detector in start-
Wait 10 seconds.
up mode.
Ensure the IRmax supply voltage is
Supply voltage
too low or too
correctly set. Ensure measurement
high.
is made directly at the detector
terminals.
Fault, host or
Power-cycle the IRmax, if fault
persists, return to Crowcon.
i-module error.
Return to Crowcon.
Fatal error; lamp
or detector fault.
Fatal error,
Check the detector configuration
module or
using PC communications kit
configuration
software.
fault.
Check power supply.
If fault persists, return to Crowcon.
Optics obscured.
Check window and mirror, clean if
necessary. Re-zero IRmax and check
calibration.
17
6. Fault finding
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