reason for removing it.
If the drive is to be used on an IT supply, then the filter must be removed.
The internal EMC filter reduces radio-frequency emissions into the mains supply. Where

the motor cable 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 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 is unacceptable or

the above conditions are true.

The above leakage currents are just the leakage currents of the drive with the internal EMC

filter connected and do not take into account any leakage currents of the motor or motor cable.

NOTE

In both cases, there is an internal voltage surge suppression device connected to

ground. Under normal circumstances, this carries negligible current.

NOTE

When the internal EMC filter is installed, the leakage current is high. In this case, a

permanent fixed ground connection must be provided using two independent conductors

each with a cross-section equal to or exceeding that of the supply conductors. The drive

is provided with two ground terminals to facilitate this. The purpose is to prevent a safety

hazard occurring if a connection is lost. Both ground connections are required to meet

the required european standard.

WARNING