ABB ACS 600 Hardware Manual page 30

Chapter 3 – Electrical Installation
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ACx 607
Frequency
Converter
1) used if the conductivity of the cable screen is <
50 % of the conductivity of the phase conductor.
2) used if the PE rail of ACx 607 is not earthed via
separate PE conductor or via cable screen.
3) used only if local safety regulations do not accept
earthing of the ACx 607 and the motor merely
through the cable screen.
Note: Connecting the fourth conductor of the
cable at the motor increases bearing currents,
thus causing extra wear.
4) The NIOC/NIOCP board is located inside the
module in ACx 604 deliveries.
3-6
A view of the recommended earthing, mains and motor cable
connections of the ACx 607 is presented below. F denotes a 360
degrees earthing.
Max 6 control cables
X2
(option)
NIOC/ NIOCP
NAMC
4)
NIOC/ NIOCP
NAMC
ACx 604
Converter Unit
UDC+
L1 L2
F F
U1 V1
EMC Line Filter
Line Options
U1
V1
UDC-
U2
V2 W2
du/dt Filter
V1
U1
~
3
Motor
ACS/ACC/ACP 604/607 Frequency Converters
L3 PE
2)
W1
PE
W1
T41
3)
F
1)
W1
For minimum radio frequency
interference (RFI) at the motor
end, earth the cable screen 360
degrees at the lead-through or
earth the cable by twisting the
screen (flattened width > 1/5 ·
length).