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E300 Design Guide 97
Issue Number: 1
4.15.1 Use of residual current device (RCD)
There are three common types of ELCB / RCD:
1. AC - detects AC fault currents
2. A - detects AC and pulsating DC fault currents (provided the DC current reaches zero at least once every half cycle)
3. 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
If an external EMC filter is used, 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.
4.16 EMC (Electromagnetic compatibility)
The requirements for EMC are divided into three levels in the following three sections:
• General requirements for all applications, to ensure reliable operation of the drive and minimise the risk of disturbing nearby equipment.
• Requirements for meeting the EMC standard for power drive systems, IEC61800-3 (EN 61800-3:2004).
• Requirements for meeting the generic emission standards for the industrial environment, IEC61000-6-4, EN 61000-6-4:2007.
The recommendations will usually be sufficient to avoid causing disturbance to adjacent equipment of industrial quality. If particularly sensitive
equipment is to be used nearby, or in a non-industrial environment, then the recommendations of Requirements for meeting the EMC standard for
power drive systems or Requirements for meeting the generic emission standards for the industrial environment should be followed to give
reduced radio-frequency emission. For full details refer to section 2.12 EMC compliance (general standards) on page 24.
In order to ensure the installation meets the various emission standards described in:
• The EMC data sheet available from the supplier of the drive
The correct external EMC filter must be used for further details refer to section 2.10 EMC filters on page 22.
N
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.
Only type B ELCB / RCD are suitable for use with 3 phase inverter drives.
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. This includes the internal EMC filter.
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