Nx Networks NX series - Manual (Page 42)

42(86) Cabling and connections
6
6.2.1.1 Control cables
The control cables shall be at least 0.5 mm
2
screened multicore cables, see Table 6-1. The
maximum terminal wire size is 2.5 mm
2
for the relay terminals and 1.5 mm
2
for other 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 6-17.
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).
Figure 6-17. Galvanic isolation barriers
Cont rol I/O
ground
Digital input
group A
Digital input
group B
Analogue
output
Digital
output
Main
circuits
Control
board
Control
panel
Control
board
nk6_15
L1 L2 L3
U V W
RO1/1
RO1/2
RO1/3
RO2/3
RO2/2
RO2/1
10Vref
GND
GND
+24V
AI1
AI2+
AI2 -
DIN1...
DIN3
CMA
DIN4...
DIN6
CMB
AO1+
AO2 -
DO1
Gate drivers