Control Cables; Galvanic Isolation Barriers - Honeywell NX series User Manual

6.2.1.1

Control cables

The control cables shall be at least 0.5 mm
terminal wire size is 2.5 mm
Find the tightening torques of the option board terminals in Table below.
Terminal
screw
Relay and thermistor
terminals
(screw M3)
Other terminals
(screw M2.6)
Table 6-8. Tightening torques of terminals
6.2.1.2

Galvanic isolation barriers

The control connections are isolated from the mains potential and the GND terminals are permanently
connected to ground. See Figure 6-28.
The digital inputs are galvanically isolated from the I/O ground. The relay outputs are additionally double-
isolated from each other at 300VAC (EN-50178).
10Vref
GND
+24V
GND
AI1
AI2+
AI2 -
DIN1...
DIN3
CMA
DIN4...
DIN6
CMB
AO1+
AO2 -
DO1
RO1/1
RO1/2
RO1/3
RO2/1
RO2/2
RO2/3
TI1+
TI1-
Figure 6-28. Galvanic isolation barriers
CABLING AND CONNECTIONS
2
screened multicore cables, see Table 6-1. The maximum
2
for the relay terminals and 1.5 mm
Tightening torque
Nm lb-in.
0.5 4.5
0.2 1.8
Control I/O
ground
Control
panel
Digital input
group A
Digital input
group B
Control
Analogue
board
output
Digital
output
2
for other terminals.
Gate drivers
L1 L2 L3
Power
board
U V W
nk6_15
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