ABB ACA 6 Series, Hardware Manual

Page: 55 / 102

Chapter 3 – Electrical Installation
ACA 6xx Sections and ACS/ACC 6x7 (132 to 3000 kW) Frequency Converters 3-13
Motor Cable
Connection Motor cable connections for different cable types are represented
below. 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).
Separate protective
conductor
A separate PE conductor system is used
only if local safety regulations do not
allow earthing of the ACx 600 and the
motor merely through the cable screen.
This solution increases motor bearing
currents compared to symmetrical
shielded cable, thus causing extra wear.
L1
L2 L3
U2 V2 W2
PE
Drive Section
U1
V1
W1
PE
M
3 ~
U2 V2 W2
PE
Drive Section
U1
V1
W1
PE
M
3 ~
U2 V2 W2
PE
Drive Section
U1
V1
W1
PE
M
3 ~
L1
L3
L2
L1
L3
L2
Concentric Al/Cu-shield
Concentric Al/Cu-shield and
steel or aluminium armour
Galvanised steel or
copper armour
Separate protective
conductor
Factory main
earth bus
Factory main
earth bus
Factory main
earth bus