Unidrive M/HS Frame 5 to 6 Power Installation Guide 51
Issue Number: 9
Safety information Product information Mechanical installation
Electrical installation
Technical data UL listing information
4.1.1 Ground connections
The drive must be connected to the system ground of the AC supply. The ground wiring must
conform to local regulations and codes of practice.
Table 4.3 Protective ground cable ratings
4.2 AC supply requirements
AC supply voltage:
200 V drive: 200 V to 240 V ±10 %
400 V drive: 380 V to 480 V ±10 %
575 V drive: 500 V to 575 V ±10 %
Number of phases: 3
Maximum supply imbalance: 2 % negative phase sequence (equivalent to 3 % voltage imbalance
between phases).
Frequency range: 45 to 66 Hz
For UL compliance only, the maximum supply symmetrical fault current must be limited to 100 kA
Table 4-1 Supply fault current used to calculate maximum input currents
4.2.1 Supply types
All drives are suitable for use on any supply type i.e TN-S, TN-C-S, TT and IT.
Supplies for size 6 drives with voltage up to 600 V may have grounding at any potential, i.e. neutral,
centre or corner (“grounded delta”). Supplies for size 5 drives (internal EMC filter fitted) with voltage
up to 480 V may have grounding at any potential, i.e. neutral, centre or corner (“grounded delta”).
Supplies with voltage above 600 V may not have corner grounding
Drives are suitable for use on supplies of installation category III and lower, according to IEC 60664-
1, this means they may be connected permanently to the supply at its origin in a building, but for
outdoor installation additional over-voltage suppression (transient voltage surge suppression) must
be provided to reduce category IV to category III.
Electrochemical corrosion of grounding terminals
Ensure that grounding terminals are protected against corrosion i.e. as could be caused
by condensation.
The ground loop impedance must conform to the requirements of local safety regulations.
The drive must be grounded by a connection capable of carrying the prospective fault
current until the protective device (fuse, etc.) disconnects the AC supply.
The ground connections must be inspected and tested at appropriate intervals.
Input phase conductor size Minimum ground conductor size
≤ 10 mm
2
Either 10 mm
2
or two conductors of the same cross-sectional area as the input
phase conductor
> 10 mm
2
and ≤ 16 mm
2
The same cross-sectional area as the input phase conductor
> 16 mm
2
and ≤ 35 mm
2
16 mm
2
> 35 mm
2
Half of the cross-sectional area of the input phase conductor
Model Symmetrical fault level (kA)
All 100
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