Control Techniques Commander SK2202 Getting Started Manual page 33

Safety Product Mechanical
Information Information Installation
Figure 4-11 Grounding link bracket folded up into its through-
panel mount position
Grounding
link bracket
4.4.2 Internal EMC filter
It is recommended that the internal EMC filter be kept in place unless
there is a specific reason for removing it.
On Commander SK size 3, 4, 5 and 6, when used with
ungrounded (IT) supplies, the internal EMC filter must be
removed unless additional motor ground fault protection is
fitted or, in the case of size 3 only, the external EMC filter is
WARNING
also used.
For instructions on removal, refer to Figure 4-12.
Figure 4-12 Removal of the internal EMC filter, size 2 and 3
Loosen/remove screws as shown (1) and (2).
Remove filter (3) and ensure the screws are replaced and re-tightened (4).
Commander SK Size 2 to 6 Getting Started Guide
Issue Number: 2
Electrical Keypad and
Parameters
Installation Display
Mounting
bracket
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Commissioning
Figure 4-13 Removal of the internal EMC filter, size 4, 5 and 6
Loosen screws (1). Remove EMC filter in the direction shown (2).
The internal EMC filter reduces radio-frequency emissions into the
mains supply. Where the motor cable length is short, it permits the
requirements of EN61800-3 to be met for the second environment. 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 instructions given above require it to be removed
or the ground leakage current of 28mA is unacceptable.
4.4.3 Use of earth (ground) leakage circuit breakers
(ELCB) / residual current device (RCD)
There are three common types of ELCB/RCD:
Type AC - detects AC fault currents
Type A - detects AC and pulsating DC fault currents (provided the
DC current reaches zero at least once every half cycle)
Type B - detects AC, pulsating DC and smooth DC fault currents
• Type AC should never be used with drives
• Type A can only be used with single phase drives
• Type B must be used with three phase drives
4.4.4 Further EMC precautions
Further EMC precautions are required if more stringent EMC emission
requirements apply:
• Operation in the first environment
• Conformity to the generic emission standards
• Equipment which is sensitive to electrical interference operating
nearby
In this case it is necessary to use:
The optional external EMC filter
A screened motor cable, with the screen clamped to the grounded
metal panel
A screened control cable, with the screen clamped to the grounded
metal panel
Full instructions are given in the Commander SK EMC Guide
A full range of external EMC filters is also available for use with
Commander SK.
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