17
®
Motor up/down outputs and feedback potentiometer inputs:
The motor up/down outputs should be connected
using multi-strand single conductor PVC insu-
lated 20AWG, 600V 90°C (16/0.2MM) wire.
Wiring must comply with all applicable codes,
ordinances and regulations and where required
must comply to NEC Class 1 (Line Voltage) wir-
ing. The connections to the motor should be
made via its switched inputs, so that the internal
microswitches prevent the motor being damaged
if it is driven to either end of its travel. Motor
supply must be fused to protect the unit and the
motors. Ensure the fuse rating is selected to suit
the current rating of the triac output option fitted.
Motor feedback potentiometer cabling must be
overall shielded 3-conductor PVC insulated 22AWG-7/30AWG, 300V 80°C (7/0.2mm) wire. Wiring
must comply with all applicable codes, ordinances and regulations and where required must comply
to NEC Class 1 (Line Voltage) wiring. Since this cable may be run in conduit with other wiring, its
voltage rating must exceed the maximum voltage carried by any other cable in the same conduit.
Connect the shield with the use of the clamping bar. Make all connections at the servo-motor first.
Incorrect connection may damage or destroy the motor potentiometer.
Pressure/temperature sensor input:
The pressure/temperature cabling
must be overall shielded multi-core
(number of conductors as required
by the relevant sensor) PVC insu-
lated 22AWG-7/30, 300V 80°C (7/
0.2mm) wire. Wiring must comply
with all applicable codes, ordinances
and regulations and where required
must comply to NEC Class 1 (Line
Voltage) wiring. Since this cable
may be run in conduit with high
voltage wiring, its voltage rating
must exceed the maximum voltage
carried by any other cable in the
same conduit.
The input is suitable for use with
0-5V or 4-20mA signals (externally or internally powered), the NX1025 / NX1030 steam pressure
sensor or the NX1040 boiler temperature sensor. Refer to option link section (page 21) for details on
setting the option links for the correct voltage and input type.
Connect the cable shield to the controller with the use of the clamping bar. In the case of the
NX1020, NX1025 and NX1030 steam pressure sensor and NX 1040 temperature sensor, connect the
cable shield at both ends.
Make all connections at the sensor/transmitter first.
Gas pressure sensor input:
M
LINE/MOTOR
CABLE CLAMP
NEUTRAL/MOTOR
COMMON
SUPPLY
MAX 4A
MOTOR COM PA 1
MOTOR UP PA 2/4/6/8
MOTOR DN PA 3/5/7/9
POT SUPPLY PE 1/4/7/10
FEEDBACK PE 2/5/8/11
POT GND PE 3/6/9/12
6
5
3
2
1
7
PB4
LOOP POWERED
4-20mA SENSOR
NX 1025/NX 1030
CABLE CLAMP
+
-
5/24V
+
-
4
3
2
1
BODY
CABLE CLAMP
OR EXT.
SELF-POWERED
4-20mA/0-5V
SENSOR SUPPLY PE 20
SENSOR IN PE 21
SENSOR GND PE 22
SENSOR IN PE 21
SENSOR SUPP PE 20
NX1040
SENSOR GND PE 22
SENSOR TEST PE 23
SENSOR
