108
Unidrive M / Unidrive HS Modular Installation Guide
Issue Number: 5
6.13 EMC (Electromagnetic compatibility)
The requirements for EMC are divided into three levels in the following
three sections:
Section 6.13.2, 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
7.1.27
Electromagnetic compatibility (EMC)
on page 150 will be met, but
no specific emission standards. Note also the special requirements
given in
Surge immunity of control circuits - long cables and connections
on page 115 for increased surge immunity of control
circuits where control wiring is extended.
Section 6.13.3, Requirements for meeting the EMC standard for
power drive systems, IEC61800-3 (EN 61800-3:2004+A1:2012)
.
Section 6.13.4, Requirements for meeting the generic emission
standards
for the industrial environment, IEC61000-6-4, EN 61000-6-
4:2007+A1:2011.
The recommendations of section 6.13.2 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 6.13.3 or
section 6.13.4 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
and
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.
6.13.1 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 EN 61800-3:2004+A1:2012 to be met for the second
environment - see section 6.13.3. 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 6-22 on page 108 for details of removing and installing
the internal EMC filter.
Figure 6-22 Removal of the Unidrive M/Unidrive HS size 9D, 10D
and 11D inverter internal EMC filter
To electrically disconnect the Internal EMC filter, remove the screw as
highlighted above (1).
The internal filter is not removable on size 9E/T, 10E/T and 11E/T.
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 6-22
the Unidrive M/Unidrive HS size 9D, 10D and 11D inverter
internal EMC filter
on page 108. Please note that the internal
filter is not removable on size 9E/T, 10E/T and 11E/T. For
details of ground fault protection contact the supplier of the
drive.
WARNING
WARNING
NOTE
WARNING
WARNING
The supply must be disconnected before removing the
internal EMC filter.
WARNING
WARNING
1
NOTE
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