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Control cables, Galvanic isolation barriers – TREND NX Variable Speed Drives User Manual

Page 79

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62 • vacon

CABLING AND CONNECTIONS

Tel. +358 (0)201 2121 • Fax +358 (0)201 212 205

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.


Find the tightening torques of the option board terminals in Table below.

Tightening torque

Terminal

screw

Nm lb-in.

Relay and

thermistor

terminals

(screw M3)

0.5 4.5

Other terminals

(screw M2.6)

0.2 1.8

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 6-26.
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 6-26. Galvanic isolation barriers

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

nk6_1 5

TI1+
TI1-

Contro l I/O

ground

Digital input
group A

Digital input
group B

Analogue
output
Digital
output

Control
board

Control

panel

Gate drivers

Power
board