Chapter 3 – Electrical Installation
3-2
ACA 6xx Sections and ACS/ACC 6x7 (132 to 3000 kW) Frequency Converters
Power Cable
Selection
The mains and motor cables must be dimensioned
according to local
regulations
:
1.
The cable must be able to carry the ACx 600 load current. See
Safety and Product Information
(or
Appendix A
for ACx 6x7) for
cable types for different load currents.
2.
The cable terminals of the ACx 600 warm up to 60
°
C (140
°
F)
during operation. The cable must be rated for at least 60
°
C (140
°
F) maximum operating temperature.
3
The cable must withstand the short-circuit current given in
Mains
Connection: Short Circuit Capability
in
Safety and Product
Information
(or in
Appendix A
for ACx 6x7).
4.
The inductance and impedance of the cable must be rated
according to permissible touch voltage appearing under fault
conditions (so that the fault point voltage will not rise too high when
an earth fault occurs).
5.
The inverter module has an electronic overload protection which
limits the largest permissible load current.
6.
If multiple motors are connected to the inverter module, a separate
thermal overload switch or a compact circuit breaker must be used
for protecting the cable and the motor. These devices may require
a separate fuse to cut off the short circuit current.
The rated voltage of the mains cables should be U
o
/U = 0.6/1 kV for
690 VAC rated equipment. (U
o
= rated voltage between the conductor
and the earth, U = rated voltage between the conductors.) For the
North American market, 600 VAC rated cable is accepted for 600 VAC
rated equipment. As a general rule, the rated voltage for the motor
cables should be minimum U
o
/U = 0.6/1 kV.
Symmetrical shielded motor cable must be used (figure below). Four-
conductor system is allowed for mains cabling, but shielded
symmetrical cable is recommended. To operate as a protective
conductor, the shield conductivity must be at least 50 % of the
conductivity of the phase lead.
Compared to a four-conductor system, the use of symmetrical shielded
cable reduces electromagnetic emission of the whole drive system as
well as motor bearing currents and wear.
The motor cable and its PE pigtail should be kept as short as possible
in order to reduce electromagnetic emission as well as capacitive
current.
Summary of Contents for ACA 6 Series
Page 4: ......
Page 8: ...Safety Instructions vi ACS 600 MultiDrive ...
Page 12: ...x ACS 600 MultiDrive Hardware Manual ...
Page 26: ...Chapter 1 Introduction 1 14 ACS 600 MultiDrive Hardware Manual ...
Page 100: ...Chapter 6 Preventive Maintenance 6 6 ACS 600 MultiDrive ...
Page 101: ......
