Chapter 3 – Electrical Installation
3-2 ACS/ACC/ACP 601 Frequency Converters
Input Cable Protection
Normal slow fuses can be used to protect the input cable in case of a
short circuit. (They do not protect the input bridge of ACx 600 in case of
a short circuit.) Slow fuses must be dimensioned according to local
safety regulations, appropriate mains voltage and the rated current of
the ACx 600 (see
Appendix A
).
Cabling Instructions
Power Cables
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.
2. The cable terminals of 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 fulfil the requirements of the short-circuit protection
used.
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).
The voltage rating of the mains cables should be 1 kV for 690 VAC
rated equipment. For the North American market, 600 VAC rated cable
is accepted for 600 VAC rated equipment. Voltage rating for the motor
cables should be minimum 1 kV as a general rule.
For ACx 601 frame size R5 and larger, or motors larger than 30 kW
symmetrical shielded motor cable must be used (figure below). A four-
conductor system can be used up to frame size R4 with up to 30 kW
motors, but shielded symmetrical motor cable is recommended.
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 (twisted screen) should be kept as
short as possible in order to reduce electromagnetic emission as well
as capacitive current.
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