Digital fire detection control panel
COMPACT LYON
FIRE PRETECTION MANUFACTURER 57
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
RELAY SHORT CIRCUIT 01 (Short circuit for the relay 1 of MDA1Y, MDA2Y or MYOA)
Cause
There is a short circuit between the output of the relay 1 of the MDA1Y, MDA2Y or
MYOA and the end-of-line resistance.
Solution
Check that the MDA1Y or MDA2Y 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). To operate correctly, the output
voltage of the relay 1 of the MDA1Y, MDA2Y or MYOA should be between -2 V and
-7,8 V in standby and 24 V to 29 V when activated.
RELAY OPEN CIRCUIT 02 (Open circuit for the relay 2 of the MDA2Y)
Cause
There is a lack of continuity between the output of the relay 1 of the MDA2Y and the end-
of-line resistance.
Solution
Check that the MDA2Y 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
chapter 1.5.3.2). Check the status of the fuse protecting the module. To operate correctly,
the output voltage of the relay 2 of the MDA2Y must be between -2 V and -7,8 V when in
standby and between 24 V and 29 V when activated.
RELAY SHORT CIRCUIT 02 (Short circuit for the relay 2 of the MDA2Y)
Cause
There is a short circuit between the output of the relay 2 of the MDA2Y and the end-of-
line resistance.
Solution
Check that the MDA2Y 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
chapter 1.5.3.2). To operate correctly, the output voltage of the relay 2 of the MDA2Y
must be between -2 V and -7,8 V when in standby and between 24 V and 29 V when
activated.
24V RELAY ( 24 V Fault in module MDA1Y, MDA2Y or MYOA)
Cause
The 24 V voltages do not reach the module from the power supply’s 30 V output, which
may be from the control panel or from an auxiliary external power source.
Solution
Check the connections for the 30V line from the control panel’s power source, or
auxiliary external power source, to the 24 V input to the MDA1Y, MDA2Y or MYOA
module, (see chapters 1.5.3.2, 1.5.3.3 and 1.5.3.7). To operate correctly, the 24 V voltage
input to the modules should be between 20 V and 29 V.
OPEN CIRCUIT 01 (Open line in MSTAY input)
Cause
There is a lack of continuity between the entrance 1 of the MSTAY and the end of line
resistance.
Solution
Verify the correct connection between the MSTAY and the elements connected to it,
verify the end of line resistance, 33 K (see 1.5.3.4 chapter). The tension of entrance 1 of
the MSTAY for a correct operation must be included between -5 V and -7 V in rest.
SHORT CIRCUIT 01 (Short line in MSTAY input)
Cause
There is a short circuit between the entrance 1 of MSTAY and the end of line resistance.
Solution
Verify the correct connection between the MSTAY and the elements connected to it,
verify the end of line resistance, 33 K (see 1.5.3.4 chapter). The tension of entrance 1 of
the MSTAY for a correct operation must be included between -5 V and -7 V in rest.
OPEN CIRCUIT 02 (Open line in MSTAY or MYOA input 2)
Causa
There is a lack of continuity between the entrance 2 of the MSTAY or MYOA and the
end of line resistance.
Solución
Verify the correct connection between the MSTAY, MYOA and the elements connected
to them, verify the end of line resistance, 33 K (see 1.5.3.4 and 1.5.3.7 chapters). The
tension of entrance 2 of the MSTAY for a correct operation must be included between -
5V and -7 V in rest.
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