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Diagnostics Optimization CT MODBUS RTU Technical Data
Installation and System Design Guide 113
Issue Number: 1
4.16 EMC filters
4.16.1 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 part of a Regenerative
system or it is connected to an IT supply 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 to be met for the second environment. With regard to motor cables, the filter provides useful reduction in emission levels 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 useful used in all applications unless the instructions given above require it to be removed or the ground leakage current of the drive is
unacceptable.
Figure 4-28 Removal of size 3 internal EMC filter
Loosen / remove the screw and nut as shown (1) and (2).
Lift away from securing points and then rotate away from the drive. Ensure the screw and nut are replaced and re-tightened with a maximum torque
of 2 N m (1.47 lb ft).
Figure 4-29 Removal of size 4 internal EMC filter
To electrically disconnect the Internal EMC filter, remove the screw (1) as highlighted above.
If the drive is used with ungrounded (IT) supplies, the internal EMC filter must be removed unless additional motor ground fault protection
is installed.
The power supply must be removed prior to removing the internal EMC filter.
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