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Unidrive M / Unidrive HS Modular Installation Guide
Issue Number: 5
6.1.3 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.
On a Unidrive M/Unidrive HS size 9, 10, 11 and rectifiers, the supply and
motor ground connections are made using an M10 bolt at the top
(supply) and bottom (motor) of the drive. See Figure 6-9 to Figure 6-14.
The supply ground and motor ground connections to the drive are
connected internally by a copper conductor with a cross-sectional area
given below:
Figure 6-9 Unidrive M/Unidrive HS size 9A/9E/10E ground
connections
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.
Electrochemical corrosion of earthing terminals
Ensure that grounding terminals are protected against
corrosion i.e. as could be caused by condensation.
Frame size
Cable cross sectional area
mm
2
9E/10E
32
9A/9D/10D
46
Frame 10 rectifier
32
11E/D
42
Frame 11 rectifier (6 pulse)
64
Frame 11 rectifier (12 pulse)
60
WARNING
WARNING
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9A
9
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