28 Chapter 3 Installation and Wiring
EV1000 Series General Purpose Variable Speed Drive User Manual
Use conductive plate and dentate pad to clear
away the paint between the screws and metal
casing, to ensure good conductivity.
PE
PE
enclosure
enclosure
Fig. 3-24 Correct Shied Layer Earthling
PE
PE
Enclosure
Enclosure
Fig. 3-25 Incorrect Shield Layer Earthing
3.2.5 Earthing
Independent earthing pole
（
Recommended
）
drive
other
equipmen
PE
Fig. 3-26 Earthing Diagram 1
Shared earthing pole
（
acceptable
）
drive
other
equipment
PE
Fig. 3-27 Earthing Diagram 2
Shared earthing lines
（
not allowed
）
drive
Other
equipment
PE
（
G
）
Fig. 3-28 Earthing Diagram 3
Besides, pay attention to the following points:
In order to reduce the earthing resistance, flat
cable should be used because the high frequency
impedance of flat cable is smaller than that of
round cable with the same CSA.
For 4-core motor cable, the end of one cable
should be connected to the PE of the drive, and
the other end should be connected to the motor’s
enclosure. If the motor and the drive each has its
own earthing pole, then the earthing effect is
better.
If the earthing poles of different equipment in one
system are connected together, then the leakage
current will be a noise source that may disturb the
whole system. Therefore, the drive’s earthing pole
should be separated with the earthing pole of
other equipment such as audio equipment,
sensors and PC, etc.
In order to reduce the high frequency impedance,
the bolts used for fixing the equipment can be
used as the high frequency terminal. The paints
on the bolt should be cleaned.
The earthing cable should be as short as possible,
that is, the earthing point should be as close as
possible to the drive.
Earthing cables should be located as far away as
possible from the I/O cables of the equipment that
is sensitive to noise, and lead should also be as
short as possible.
drive
other
equipment
PE
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