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126 Unidrive M Regen Design Guide
Issue Number: 4
The DC fuse voltage rating must be suitable for the drive’s DC bus voltage range.
Ground connections
The drive must be connected to the system ground of the AC supply. The ground wiring must conform to local regulations and codes of practice.
6.3.3 Main AC supply contactor
The recommended AC supply contactor type is AC1.
6.3.4 Motor winding voltage
Refer to the guidelines given in the relevant Unidrive M Power Installation Guide. The DC bus voltage in a Regen system with a 400 V supply is
usually 700V, which corresponds to an AC supply voltage of 519 V. Unless the motor cable is less than 10 m long it is recommended that either an
inverter-grade motor should be used or else output chokes should be fitted to protect the motor from the effect of the fast-rising output voltage pulses.
6.3.5 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 with an ELCB / RCD, 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.
6.4 EMC (Electromagnetic compatibility)
The requirements for EMC are divided into three levels in the following three sections:
• section 6.5.2, 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 section 10.5 Electromagnetic compatibility (EMC) on page 303 will be met, but
no specific emission standards are applied.
• section 6.5.3, Requirements for meeting the EMC standard for power drive systems, IEC61800-3 (EN 61800-3:2004+A1:2012).
• section 6.5.4, Requirements for meeting the generic emission standards for the industrial environment, IEC61000-6-4, EN 61000-6-
4:2007+A1:2011.
The recommendations of section 6.5.2 General requirements for EMC on page 130 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 6.5.3 or section 6.5.4 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 10 Technical data on page 276
The correct external EMC filter must be used and all of the guidelines in section 6.5.2 General requirements for EMC on page 130 and section 6.5.4
Compliance with generic emission standards on page 131 must be followed.
Only type B ELCB / RCD are suitable for use with 3-phase inverter drives.
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