Installation manual
Troubleshooting
43
Chapter 10
Troubleshooting
10.1
Fault NAC, alarm or 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.
10.2
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 integrity of the connection wiring and the integrity cable in the first section of the loop.
• If the “
Shorted Loop-I
” 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-I terminals and their nearest
isolator.
Check the integrity of the connection wiring and the integrity of the cable in the last section of the loop.
• 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-I 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 traced the isolator in question, check the successive isolator on the loop which, very probably,
will also be open.
Check the integrity of the wiring in the section between the two isolators.
- Cable Interruption
Disconnect the Loop-I terminals of the panel.
Check the condition of the loop-device LEDs (blinking) until you find the point where the loop is inter-
rupted.
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)
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)
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
- Check that the blinking Loop transmission LED (red) corresponds to the respective loop settings. If the
LED does not correspond, check the loop parameters.
- The green LED of each loop will blink each time an interrogated device responds. If this LED is On solid,
it means the device response is masked by an anomalous current flow through the conductive path
between the two poles of the loop.
Summary of Contents for SmartLoop Series
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