RKI Instruments GD-70D4H-XX - Manual (Page 9)

Model GD-70D4H-XX Sample Draw Transmitter • 6
the opposite end of the tubing to an open area where the sample can safely disperse or
to an exhaust duct.
Wiring the GD-70D to a Controller and AC Power
WARNING: Always verify that power to the GD-70D4H-XX and to the controller are
off and that the controller’s and GD-70D’s power switches are in the off
position before making wiring connections or adjustments.
1. Turn off power to the controller and the GD-70D4H-XX.
2. Place the controller’s and GD-70D’s power switches in the OFF position.
3. Use the conduit hubs at the bottom of the GD-70D4H-XX for routing power and
signal cables into the enclosure. Route a 3-wire power cable (18 AWG) and any relay
wiring through one conduit hub, and 2-conductor shielded cable, or two wires in
conduit through the other conduit hub to minimize crosstalk.
Figure 4: External Wiring
4. If shielded cable is used for controller wiring, connect the signal cable shield’s drain
wire to a chassis ground at the controller, but do not connect it at the GD-70D4H-XX.
CAUTION: Leave the cable shield’s drain wire insulated and disconnected at the
GD-70D4H-XX. You will connect the opposite end of the cable shield’s drain wire at
the controller.
1 2 3 4 5 6 7
+ + - -
ALM1 DC24V 4-20mA ALM2 FAULT
+
-
-
+
GD-70D Terminal Strip
8 9 10
From
Power
Supply
Alarm
Device
Alarm
Device
(+) H
AC Terminal Strip
Strobe
Light
100-240 VAC
H N G
4 - 20 mA In (FB)
- (DC Ground)
Controller
(-) N
External Power
Source
+ (No Connection)
(+) H
(-) N
External Power
Source