Table Of Functions (Identified By Silk Screen Legend On Relay Board And Photo Annotations) - GasTech D-Guard2S Operator's Manual

19.1.2

Table of Functions (identified by silk screen legend on relay board and photo annotations)

Function Description
Supplies power to the relay board and the detector main circuit board.
24V
Connect to positive side of the power supply.
Current loop output signal (sourcing type output).
FB (feedback)
Connect to an external controller input that has an input shunt sense resistor.
Power supply return.
0V
Connect this to negative side of the power supply.
Detector board positive power supply output.
DG+
Connect to the detector main PCB supply positive input.
Detector board negative power supply output.
DG-
Connect to the detector main PCB supply negative input.
First alarm relay. Changes state when measured gas level exceeds the alarm 1 threshold
Alarm 1
setting.
NC and NO connections apply to normally de-energised relay settings.
For normally energised relays, the function of NC and NO are reversed.
Second alarm relay. Changes state when measured gas level exceeds the alarm 2
Alarm 2
threshold setting.
NC and NO connections apply to normally de-energised relay settings.
For normally energised relays, the function of NC and NO are reversed.
Normally energised Fault Relay.
Fault
De-energises if power to the detector is removed or if detector fault is present.
This configures the detector to operate in standalone mode where a system controller is
Loop Jumper
not present
Connect to the factory fitted Sounder / Strobe on D-Guard
Siren
Install this jumper to enable the siren when Alarm 1 is active (normally de-energised relay
Alarm 1 siren
setting only).
Install this jumper to enable the siren when Alarm 2 is active (normally de-energised relay
Alarm 2 siren
setting only).
57
D-Guard
2
S units.
2