Wire Relay Connection; Figure 21 - 4 Wire Relay Connection - FGD FlameSpec UV-IR User Manual

FlameSpec UV-IR User Manual F110V0020.08
2.9

4 Wire Relay Connection

This wiring option uses the fault and alarm relay and are connected to fire alarm panels. This
connection allows to connect several detectors on 4 wires in a single loop. On the last detector there
is a connected EOL resistor in the connection box. The value of the resistor depends on the control
panel specification.
The number of detectors in a single loop depends on the control panels power supply capacity and
length on wire width.
In fault condition, the fault relay will open the contact. The control panel will see an open loop and
will report a fault.
In alarm condition, the alarm relay will close the contact and short the loop. With this configuration,
the panel does not know which detector in the loop caused the alarm or fault. See figure below.
F 21 - 4 W R C
IGURE IRE ELAY ONNECTION
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