Use Of Earth (Ground) Leakage Circuit Breakers (Elcb) / Residual Current Device (Rcd); Emc; Internal Emc Filter; Removing The Internal Emc Filter - Leroy-Somer Digidrive SK Serie Guía De Usuario

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When the internal EMC filter is fitted, 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
WARNING
hazard occurring if a connection is lost.
4.2.1 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
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
4.3

EMC

4.3.1

Internal EMC filter

It is recommended that the internal EMC filter is kept in place unless there is a specific
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.
4.3.2

Removing the internal EMC filter

Figure 4-3 Removal and re-fitting of internal EMC filter
58
English Deutsch
reaches zero at least once every half cycle)
A
B
Italiano
Internal
EMC filter
Tab fully inserted:
EMC filter fitted
Internal
EMC filter
Tab fully extended:
EMC filter disconnected
Digidrive SK Getting Started Guide
Issue Number: a
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