Service & Maintenance Manual 5Troubleshooting
5100614_CFD5000 T - CM4.3_Service & Maintenance Manual_T_EN_2020_E
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5 Troubleshooting
5.1 Prerequisites for Troubleshooting
DANGER!
Troubleshooting for different faults must be performed by a service engineer with
proper training to service the fire detection system in a safe and correct way.
WARNING!
Locate and correct faults of the following types as prompt as possible in order to
secure the functionality of the complete FDS:
•
Any internal hardware or software fault.
•
A short circuit on a loop-line cable.
•
A single short circuit will not cause malfunction. However, if there is a
short circuit in more than one place all loop units between the short
circuits will lose communication with the FDS.
•
A loop-line cable break.
•
A single cable break will not cause malfunction. However, if there is a
cable break in more than one place all loop units between the cable
breaks will lose communication with the FDS.
•
A sub-loop cable break.
•
The loop units which can have a sub-loop are some types of detectors
and I/O units.
•
An earth fault on a loop cable.
•
A wrong loop unit address.
•
A correct address is essential to communicate alarms from the loop unit
to the central unit.
•
A broken input or output on a loop unit.
•
A fault on the serial communication between a superior system and the fire
detection system - where only one serial communication channel is used.
•
If a redundant channel is used for communication the communication
will still work until the faulty channel is working again.
WARNING!
Locate and correct faults of the following types as prompt as possible in order to
secure the functionality of the complete FDS:
•
If the external power supply is lost.
•
If the internal battery (if used) can't be charged.
•
Communication problems on a loop-line due to high external electromagnetic
interference.
•
It is highly important to eliminate or reduce any external interference to
restore communication on the loop-line.
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