Unidrive M/HS Frame 5 to 6 Power Installation Guide 67
Issue Number: 9
Safety information Product information Mechanical installation
Electrical installation
Technical data UL listing information
4.11.1 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.
4.12 EMC (Electromagnetic compatibility)
The requirements for EMC are divided into three levels in the following three sections:
• section 4.12.3, General requirements for EMC this is for all applications, to ensure reliable
operation of the drive and minimise the risk of disturbing nearby equipment. The immunity
standards specified in Chapter 5.1.25 Electromagnetic compatibility (EMC) on page 101 will be
met, but no specific emission standards are applied.
• section 4.12.4, Requirements for meeting the EMC standard for power drive systems, IEC
61800-3 (EN 61800-3:2004+A1:2012).
• section 4.12.5, Requirements for meeting the generic emission standards for the industrial
environment, IEC 61000-6-4, EN 61000-6-4:2007+A1:2011.
The recommendations of section 4.12.3 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 section 4.12.4 or section 4.12.5 should
be followed to give reduced radio-frequency emission.
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 Declaration of Conformity at the front of this manual
• Chapter 5 Technical data on page 82
The correct external EMC filter must be used and all of the guidelines in section 4.12.3 General
requirements for EMC Ground (earth) connections on page 73 and section 4.12.5 Compliance with
generic emission standards on page 76 must be followed.
Only type B ELCB / RCD are suitable for use with 3 phase inverter drives.
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