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Electrical Installation
68 Unidrive M Modular Installation Guide
Issue Number: 2
6.10 EMC (Electromagnetic compatibility)
The requirements for EMC are divided into three levels in the following
three sections:
Section 6.10.2, General requirements for all applications, to ensure
reliable operation of the drive and minimise the risk of disturbing nearby
equipment. The immunity standards specified in section 11 will be met,
but no specific emission standards. Note also the special requirements
given in Surge immunity of control circuits - long cables and connections
outside a building on page 74 for increased surge immunity of control
circuits where control wiring is extended.
Section 6.10.3, Requirements for meeting the EMC standard for
power drive systems, IEC61800-3 (EN61800-3:2004).
Section 6.10.4, Requirements for meeting the generic emission
standards for the industrial environment, IEC61000-6-4, EN61000-6-
4:2007.
The recommendations of section 6.10.2 General requirements for
EMC on page 69 will usually be sufficient to avoid causing disturbance
to adjacent equipment of industrial quality. If particularly sensitive
equipment is to be used nearby, or in a non-industrial environment, then
the recommendations of section 6.10.3 Compliance with EN 61800-
3:2004 (standard for Power Drive Systems) on page 71 or section
6.10.4 Compliance with generic emission standards on page 72 should
be followed to give reduced radio-frequency emission.
In order to ensure the installation meets the various emission standards
described in:
• The EMC data sheet available from the supplier of the drive
• The Declaration of Conformity at the front of this manual
The correct external EMC filter must be used, and all of the guidelines in
section 6.10.2 General requirements for EMC on page 69 and section
6.10.4 Compliance with generic emission standards on page 72 must be
followed.
N
The installer of the drive is responsible for ensuring compliance with the
EMC regulations that apply where the drive is to be used.
6.10.1 Internal EMC filter
It is recommended that the internal EMC filter be kept in place unless
there is a specific reason for removing it.
If the drive is used as part of a regen system, then the internal EMC filter
must be removed.
The internal EMC filter reduces radio-frequency emission into the line
power supply. Where the motor cable is short, it permits the
requirements of EN61800-3:2004 to be met for the second environment
- see section 6.10.3 Compliance with EN 61800-3:2004 (standard for
Power Drive Systems) on page 71. For longer motor cables the filter
continues to provide a useful reduction in emission level, and when used
with any length of shielded motor cable up to the limit for the drive, it is
unlikely that nearby industrial equipment will be disturbed. It is
recommended that the filter be used in all applications unless the ground
leakage current of 56 mA is unacceptable or the above conditions are
true. See Figure 6-13 on page 68 for details of removing and installing
the internal EMC filter.
Figure 6-13 Removal of the Unidrive M size 9 and 10 Inverter
internal EMC filter
To electrically disconnect the Internal EMC filter, remove the screw as
highlighted above (1).
High ground leakage current
When an EMC filter is used, a permanent fixed ground
connection must be provided which does not pass through a
connector or flexible power cord. This includes the internal
EMC filter.
When the drive is used with ungrounded (IT) supplies the
internal EMC filter must be removed unless additional motor
ground fault protection is installed.
For instructions on removal, refer to Figure 6-13 Removal of
the Unidrive M size 9 and 10 Inverter internal EMC filter on
page 68.
For details of ground fault protection contact the supplier of
the drive.
The supply must be disconnected before removing the
internal EMC filter.
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