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Diagnostics and fault solutions
Conventional fire detection control panel
Chapter 16
Diagnostics and fault solutions
Danger:
Only authorized operators (Level 2 or 3) may search for, and correct faults.
16.1 Fault “Open”
The panel is unable to find the EOL resistor on the supervised input/output terminals. The following line will
specify the terminals concerned (NAC, detection line, I/O line, etc.).
Check the EOL resistor connection on the last device. Using a tester check that the resistor has not burnt
out.
16.2 Fault “Shorted”
A short-circuit has been detected on the input/output terminals. The next line indicates the specific
terminals (NAC, on a module connected to the detection line, etc.). Check the device connections and cable
sections.
16.3 Repeater faults
If the number of repeaters recognized by the control panel is less than expected (refer also to
Chapter 12 -
Configuring the devices connected to the RS485 BUS
):
1. Check that the address of each repeater has been set properly (by means of the DIP switches (
Figure
10 - The rear side of the repeater board, [A]
).
2. Check that the cabling is intact.
3. Check the connection polarity.
4. Check that the EOL jumper is in the EOL position only on the last repeater connected the BUS.
5. Using a tester, measure the voltage across the +24 V and GND terminals of the RS485 BUS.
If the voltage is less than 20V, it means that the resettable protection fuse is open and the current draw
of the devices connected to the BUS is excessive. Disconnect the BUS devices and reconnect them one
by one until you find the problem.
16.4 Battery faults
16.4.1 Battery Disconnected
The battery is not connected or has failed the batter efficiency test.
1. Allow the batteries to charge for several hours.
2. If the fault signal persists, disconnect the batteries from the panel and test them separately.
3. If only one of the batteries has a current below 12.5 - 13 V:
•Replace the faulty battery only.
•Allow the batteries to charge for several hours.
•Check that the fault has cleared.
4. If both batteries have a voltage of 12.5 - 13 V, it means they are both inefficient (even though the
voltage without load is correct).
•Replace both batteries.
•Allow them to charge for several hours.
•Check that the fault has cleared.
16.4.2 Low Battery
