Installation Manual
Troubleshooting 47
Chapter 9
Troubleshooting
9.1 NAC, Alarm and Fault output trouble
Using a multimeter or similar tool, check the voltage on the terminals. During normal operating
conditions (standby status), the measurement should be around 15 V with reverse polarity with
regard the silk-screened indications on the terminal board.
• If the measurement is around 24 V with reverse polarity with regard the silk-screened indications
on the terminal board, then either the circuit does not end on the EOL resistance or there is an
interruption on the cable.
- Check the integrity of the device connections and the EOL resistance on the last device.
- Check the cable continuity.
• If the measurement is around 0 V the cable is shorted.
- Check the device connections and the various cable sections.
9.2 LOOP Fault
•If the Shorted Loop OUT warning appears on the panel display, a short-circuit in the loop across
the Loop-O terminals and the first isolator has been detected.
- Check the connection wiring and the integrity of the cable in the first section of the loop.
•If the
Shorted Loop IN warning appears on the panel display (for loops with 4-wire circuitry
only), a short-circuit in the loop has been detected in the section across the
Loop-1 terminals and
their nearest isolator.
- Check the integrity of the connection wiring and the integrity of the cable in the section
concerned.
•If the
Shorted OPEN warning appears on the panel display (for loops with 4-wire circuitry only),
the Loop continuity across the Loop-O and Loop-1 terminals is interrupted. This may be caused by:
- An OPEN isolator in the loop
Check all the isolators in the loop. At least one of the isolator LEDs will signal “Isolated” status.
Once you have identified the “open” isolator, check the loop connection wiring and the cable sec-
tion concerned, and the adjacent sections, which may also be “open”.
- Cable Interruption
Disconnect the Loop-1 terminals of the panel.
Access the
Main menu from the panel
Select
Maintenance>Test LEDs Points - this menu will allow you to switch On/Off the device
LEDs.
Search the loop for the last device in proper working order. NOTE After testing a device LED,
ensure that it is OFF before going to the LED of the next device.
Once the last device in proper working order has been identified, check the integrity of the wiring
and the cable in the successive section.
- Missing loop devices (the panel is unable to find some of the connected loop devices)
Access the
Main menu from the panel.
Select
Maintenance> Test LEDs Points - this menu will allow you to switch On/Off the loop
device LEDs.
Search the loop for the missing devices.
Once the missing devices have been identified, check the integrity of the wiring and the address of
each missing device.
- Duplicated address (an address has been assigned to more than one device)
Access the
Main menu from the panel.
Select
Maintenance>Test LEDs Points - this menu will allow you to switch On/Off the device
LEDs.
Switch On the LED of the devices that signal duplicated address.
Search the loop for the devices concerned.
Once the devices have been identified, check the address of each device and rectify the error.
• Loop status LEDs - TRANSMISSION
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