53
2.4 Electrical connections
All connections are made via the screw terminal block mounted on the
PCB in the junction box. The terminals are marked ‘+’, ‘sig’ and ‘’ and
correct polarity should be observed when connecting the detector to
control equipment.
Xgard
Type 6 is factory set as a ‘current sink’ device
unless otherwise specified when ordering. To reset to ‘current source’,
open the junction box and move the two links on the amplifier PCB from
the ‘sink’ position to the ‘srce’ position, as shown in Diagram 14.
Note: The internal grounding terminal (see diagram 14) shall be used as
the grounding means of the
Xgard
gas detector. The external grounding
terminal (see diagram 14) is only a supplemental bonding connection, and
is only to be used where local authorities permit or require such a
connection. To limit radio frequency interference, the junction box and
cable armour should be grounded (earthed) at the control panel. Ensure
the earth connection is provided in a safe area only, so as to avoid earth
loops.
Diagram 15:
Xgard
Type 6 electrical connections
2. Installation
Xgard Type 6
SIG
SIG
Xgard
Type 6 PCB
Control Panel
Earth
1030 V dc
420 mA
(Sink or Source)
