Digital fire detection control panel
COMPACT LYON
56
FIRE PRETECTION MANUFACTURER
Ctra. de Molins de Rei a Rubí, Km. 8,4 - 08191 RUBÍ (Barcelona) ESPAÑA.
Tlf.: +34 935 862 690 - Fax:+34 936 999 261 - cofem@cofem.com - www.cofem.com
4.3.- LOOP FAULTS
ELEMENT NOT RESPONDING
Cause
An element in the loop has stopped working.
Solution
Check that the element has not been removed from the installation, check that the element
is correctly connected and that the loop voltage reaching it is between 22V and 35V. Also
check that it has not been affected by external agents such as water leaks, etc.
If this fault affects several elements, check whether they are all between the same two
insulators. If this is the case, check that section of the installation, as there must be a short
circuit in the wiring.
EXCESSIVE POWER CONSUMPTION
Cause
The loop is overloaded or has a short circuit; the voltage in the loop is below 22V.
Solution
Check the wiring for the affected loop, check for possible short circuits, and check
whether there are elements connected to the loop that should not be directly connected to
it, such as: conventional detectors, end-of-line condensers or resistances, electromagnets,
sounders, etc. Also check that it has not been affected by external agents such as water
leaks, etc. Once the original cause of the fault has been located and resolved, wait 5
minutes before resetting the incident in the control panel, since the protection elements
need to cool down. For normal operation, the voltage in the loop should be between 22V
and 35V.
OPEN LOOP
Cause
The loop is no closed correctly.
Solution
Review the wiring and the connection of the affected loop.
OPEN CIRCUIT IN MASTER (Open Circuit in the KMAY master for conventional detectors)
Cause
There is a lack of continuity in the wires for the line of slaves from the KMAY to the end
of the line. The end-of-line is not mounted.
Solution
Check that the KMAY is correctly connected to the detectors and manual call points
which are connected to it. Check that the end-of-line 10uF-63V condenser is correctly
connected, and with the right polarity (see chapter 1.5.3.1). To operate correctly the
KMAY’s output voltage should be between 18V and 21V.
SHORT CIRCUIT IN MASTER (Short Circuit in the KMAY master for conventional detectors)
Cause
There is a short circuit in the connections from the KMAY to the end of the line.
Solution
Check that the KMAY is correctly connected to the detectors and manual call points
which are connected to it. Check that the end-of-line 10uF-63V condenser is correctly
connected, and with the right polarity, and check that the slave manual call points are
connected with the correct polarity (see chapter 1.5.3.1). To operate correctly the
KMAY’s output voltage should be between 18V and 21V.
RELAY OPEN CIRCUIT 01 (Open circuit for the relay 1 of the MDA1Y, MDA2Y or MYOA)
Cause
There is a lack of continuity between the output of the relay 1 of the MDA1Y, MDA2Y or
MYOA and the end-of-line resistance.
Solution
Check that the MDA1Y, MDA2Y or MYOA is correctly connected to the sounders
connected to it, check that the 33 K end-of-line resistance and the supervision diodes are
correctly mounted (see chapters 1.5.3.2, 1.5.3.3 and 1.5.3.7). Check the status of the fuse
protecting the module. To operate correctly, the output voltage of the relay 1 of the
MDA1Y, MDA2Y or MYOA must be between -2 V and -7,8 V when in standby and
between 24 V and 29 V when activated.
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