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80
Unidrive SPM User Guide
www.controltechniques.com Issue Number: 3
6.13.2 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 to be met for the second environment - see
section 6.13.4
Compliance with EN 61800-3 (standard for Power Drive
Systems)
on page 83 and section 14.1.26
Electromagnetic compatibility
(EMC)
on page 272. 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 56mA is unacceptable or the above conditions are true. See
Figure 6-19 for details of removing and installing the internal EMC filter.
Figure 6-19 Removal of internal EMC filter
Loosen screws (1). Remove EMC filter in the direction shown (2).
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 6-19
Removal of
internal EMC filter
on page 80.
For details of ground fault protection contact the supplier of
the drive.
WARNING
1
2
