Wire Relay Connection; Figure 19 - 4 Wire Relay Connection - FGD FlameSpec IR3 Series User Manual

FlameSpec IR3 User Manual F120V0020.07

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 know which detector in the loop caused the alarm or fault. See
figure below.
F 19 - 4 W R C
IGURE IRE ELAY ONNECTION
For more information & technical support: (+1) 714-671-8500 · support@fg-detection.com 18