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

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6.2.1.1

Control cables

The control cables shall be at least 0.5 mm
maximum terminal wire size is 2.5 mm
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 6-17.
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
nk6_15
Figure 6-17. Galvanic isolation barriers
6
Cabling and connections
2
for the relay terminals and 1.5 mm
Cont rol I/O
ground
Control
panel
Digital input
group A
Digital input
group B
Control
Analogue
board
output
Digital
output
2
screened multicore cables, see Table 6-1. The
Gate drivers
Main
circuits
2
for other terminals.
L1 L2 L3
Control
board
U V W