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128 Unidrive M Regen Design Guide
Issue Number: 4
6.5 External EMC filter
6.5.1 Removal of internal EMC filter
Figure 6-17 Removal of the size 3 internal EMC filter
Remove the screw and nut (1) and (2) as shown above.
Lift away from the securing points and rotate away from the drive.
Ensure the screw and nut are replaced and re-tightened with a
maximum torque of 2 N m (17.7 lb in).
Figure 6-18 .Removal of the size 4 internal EMC filter
To electrically disconnect the Internal EMC filter, remove the screw as
highlighted above (1).
When a EMC filter is used, the switching frequency filter
detailed must also be used. Failure to observe this may result
in the EMC filter becoming ineffective and being damaged.
If an external EMC filter is used with an ELCB / RCD, a delay
of at least 50 ms should be incorporated to ensure spurious
trips are not seen. The leakage current is likely to exceed the
trip level if all of the phases are not energized simultaneously.
Refer to section 6.3.5 Use of residual current device (RCD)
on page 126.
It is not possible to use the combi filter solution in a braking
resistor replacement system.
When using the Regen drive as a braking resistor
replacement, the Regen input must have an isolating
transformer installed so that the Regen drive input can float
with respect to ground.
The combi filter combines the switching frequency filter and
EMC filter into one item. A significant part of an EMC filter
are the capacitors between line and ground.
The result of placing a combi filter in circuit between the
Regen drive and isolating transformer is that the ground
connection to the combi filter prevents the Regen drive input
from floating and damage to the system will therefore occur.
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.
Compliance with local EMC regulations
The installer of the drive is responsible for ensuring
compliance with the EMC regulations that apply in the
country in which the drive is to be used.
The internal EMC filter must be removed from the drive.
The supply must be disconnected before removing the
internal EMC filter.
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