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receiver which is connected, a common signal is alarm. If it is no alarm at all
receivers that loop current will be limited by the terminating resistor RT and wire
resistance and zone to be normal. In this case it is possible to connect all receivers
to the power supply within the power supply output current Iout (A); maximum
number of receivers n=80*Iout.
zone
Figure 4
The output "FAULT" is galvanically isolated (dry contact). In the quiescent
mode (as well as "ALARM (FIRE)" and "TEST FIRE") contacts are closed, in the
“FAULT”, “FAULT-TEST” modes contacts are open.
The output "FAULT" is connected to the zone (
zone n+1
in the Figure 3)
through the current-limiting resistor RLIM and in case of a fault, this loop is set to
an open.
It is possible to connect the outputs "FAULT" of all receivers to one zone in
series with a current-limiting resistor at the farthest receiver (as in Figure 3). In
this case, the faults on all the connected receivers will be processed by OR, that is,
if it is faulty at least in one receiver which is connected, a common signal is faulty
and will in breakage. If it is no fault at all receivers that loop current will be limited
by the load resistor set (RLIM in Figure 3) and wire resistance and zone to be
normal.
The total resistance of the wires used to connect "FAULT" outputs, should not
be in place with the current-limiting resistor exceed resistance limiting current
standards for the zone.
If it is necessary to distinguish between the break of the loop and the
malfunction of the receivers and monitor the condition of the actual fault zone, the
