RKI Instruments GD-70D4A-XX - Manual (Page 9)

Model GD-70D4A-XX Sample Draw Transmitter • 6
Wiring the GD-70D to a Controller and AC Power
WARNING: Always verify that power to the GD-70D4A-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-70D4A-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-70D4A-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 5: 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-70D4A-XX.
CAUTION: Leave the cable shield’s drain wire insulated and disconnected at the
GD-70D4A-XX. You will connect the opposite end of the cable shield’s drain wire at
the controller.
CAUTION: At the controller, do not route power and GD-70D wiring through the same conduit
hub. The power cable may disrupt the transmission of the GD-70D’s signal to the
controller.
1 2 3 4 5 6 7
+ + - -
ALM1 DC24V 4-20mA ALM2 FAULT
From
Power
Supply -
+
GD-70D Terminal Strip
8 9 10
Alarm
Device
(+) H
AC Terminal Strip
100-240 VAC
H N G
4 - 20 mA In (FB)
- (DC Ground)
(-) N
External Power
Source
(+) H
(-) N
External Power
Source
External Power
Source
(-) N
+ (No Connection)
Controller
Alarm
Device
Alarm
Device
(+) H