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Chapter 4 – Electrical Installation
Control Connections
X2/X1*
1
2
*The NBRA-658, NBRA-659 and NBRA-669 are
equipped with an internal temperature sensitive
switch. In these units, NBRC terminal block X2
is wired via this switch to a separate terminal
block (X1), shown in the NBRA-658/659/669
dimensional drawing.
Fibre Optic Cable Connection
V23
Chopper control signal from another
chopper (Receiver)
V22
Chopper control signal to another
chopper (Transmitter)
X3
1
normally open
2
common
3
normally closed
4-2
The chopper control connections are shown below. The chopper is also
operational without the control connections.
Enable Input
(Normally closed)
Closed = Operation enabled
Open = Operation disabled
(Refer to page 3-2)
Fault Indication Relay Output
Continuous current: 2 A RMS
Switching capacity:
8 A, 24 V d.c.
0.4 A, 120 V d.c.
2000 VA, 250 V a.c.
Figure 4-1 Control connections.
The use of the relay output for controlling the main contactor of the
ACS 600 is highly recommended (see page 4-3). The enable input and
the fibre optic connection are optional (see page 4-4).
The terminals for the control connections are on the chopper control
board (NBRC), located inside the chopper housing. The front plate of
the chopper must be removed to access the terminals.
WARNING! Before starting the installation work inside the ACS 600:
Switch off the ACS 600 power supply. Wait for five minutes to ensure
that the intermediate circuit is discharged. Switch off dangerous
voltages connected from external circuits to the digital inputs and to the
relay outputs of the ACS 600.
WARNING! Do not touch the printed circuits. They are extremely
sensitive to electrostatic discharge.
NBRA-653/654/655/656/657,
NBRA-663/664/666/667
1
1
°
t
2
2
1
2
3
NBRA-658/659,
X1
°
t
1
°
t
2
Installation and Start-up Guide for NBRA-6xx
X2
V23
V22
X3
NBRC
NBRA-669
1
X2
2
V23
V22
1
X3
2
3
NBRC
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