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Diagnostics Optimization CT MODBUS RTU Technical Data
Installation and System Design Guide 83
Issue Number: 1
Size 7
On size 7, the supply and motor ground connections are made using the
M8 studs located by the supply and motor connection terminals.
Size 8 to 11
On size 8 to 11, the supply and motor ground connections are made
using the M10 studs located by the supply and motor connection
terminals.
Figure 4-11 Size 7 to 11 ground connections
1. Ground connection studs.
Table 4-2 Protective ground cable ratings
4.4 Ratings
4.4.1 Fuses and cable sizes
Nominal cables sizes below are based on the cable installation method B2 (ref: IEC60364-5-52:2001) unless otherwise specified, and are provided as
a guide only. Ensure cables used suit local wiring regulations.
The continuous output current ratings given below are for maximum 40 °C (104 °F), 1000 m altitude and 3 kHz switching frequency. Derating is
required for higher switching frequencies, ambient temperature >40 °C (104 °F) and high altitude.
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.
Fuses
The AC supply to the drive must be installed with suitable protection against overload and short-circuits. The following section shows
recommended fuse ratings. Failure to observe this requirement will cause risk of fire.
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