Chapter 4 – Electrical Installation
Installation and Start-up Guide for NBRA-6xx 4-3
Relay Output The relay output indicates chopper faults. The changeover switch
opens when a failure is detected or the chopper is unpowered.
WARNING! In a chopper failure, always switch off the power supply to
the ACS 600. This is the only way to guarantee safe operation in case
of a chopper failure since the chopper is unable to disconnect the
resistor from the intermediate circuit.
It is highly recommended that the ACS 600 be equipped with a main
contactor and a manual control switch (or switches). See Figure 4-2
below for connection examples.
Figure 4-2 Examples of using the chopper relay output.
Example 1:
ACS 600
U1 V1 W1
L1 L2 L3
Fuses
1
2
3
4
5
6
1
2
13
14
1
2
3
4
0
1
K
S1
3
NBRC
K1
S1
1
2
3
4
KXX
1X
0
0
1
K
ACS 600
U1 V1 W1
L1 L2 L3
Fuses
1
2
3
4
5
6
13
14
3
4
1
2
1
2
3
NBRC
K1
Example 2:
X3
X3
Control
Board
OFF
Control
Board
ON
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