Design Guide | iC7-Automation Air-cooled Enclosed Drives Electrical Installation
6 Electrical Installation
6.1 Fuse Guidelines
The drive system is equipped with fast-acting AC fuses to limit the damages of the drive system.
See the fuse tables:
9.6.1 Fuse Size Tables.
To ensure fuse performance, make sure that the available supply short-circuit current is sufficient. Check the minimum required values
(I
SC
) at the fuse location.
DC fuses are preinstalled for parallel units in frames AE10, AE11, IE10, and IE11. Do not replace the DC fuses with any other types.
6.2 Grounding Principles
Ground the AC drive in accordance with applicable standards and directives.
According to IEC 60364-5-54; 543.1, unless local wiring regulations state otherwise, the cross-sectional area of the protective grounding
conductor must be at least ½ times of the phase conductor and made of the same material when the phase conductor cross-section is
above 35 mm
2
(AWG 2).
The connection must be fixed.
WARNING
ELECTRICAL SHOCK HAZARD - LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to connect the drive properly to protective earth (PE) can result in
death or serious injury.
l Ensure reinforced protective earthing conductor according to IEC 60364-5-54 cl. 543.7 or according to
local safety regulations for high touch current equipment. The reinforced protective earthing of the drive
can be done with:
l a PE conductor with a cross-section of at least 10 mm
2
(8 AWG) Cu or 16 mm
2
(6 AWG) Al.
l an extra PE conductor of the same cross-sectional area as the original PE conductor as specified by IEC
60364-5-54 with a minimum cross-sectional area of 2.5 mm
2
(14 AWG) (mechanically protected) or 4 mm
2
(12 AWG) (not mechanically protected).
l a PE conductor completely enclosed with an enclosure or otherwise protected throughout its length
against mechanical damage.
l a PE conductor part of a multi-conductor power cable with a minimum PE conductor cross-section of 2.5
mm
2
(14 AWG) (permanently connected or pluggable by an industrial connector. The multi-conductor
power cable shall be installed with an appropriate strain relief).
l NOTE: In IEC/EN 60364-5-54 cl. 543.7 and some application standards (for example IEC/EN 60204-1), the
limit for requiring reinforced protective earthing conductor is 10 mA leakage current.
6.3 Cable Requirements
Follow these requirements for the mains and motor cables used in the drive system.
l Select and install mains cables and motor cables according to the local safety regulations, the input voltage, and the load current of
the drive.
l Use motor cables rated for +90 °C for IEC, +75 °C (167 °F) for UL. Consider the operating temperature of the mains terminals, and
make sure that the mains cables do not overheat near the mains terminals.
Danfoss Drives Oy © 2024.09 AJ389643274589en-000101 / 172F6409A | 39
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