Unidrive M400 Quick Start Guide 13
Issue Number: 5
15.4 mA* AC at 230 V, 50 Hz (1 phase, line to neutral supply, star point ground)
9.6 mA* AC at 400 V, 50 Hz (3 phase supply, star point ground)
Size 3:
19.7 mA* AC at 400 V 50 Hz (star point ground)
47.4 mA* AC at 400 V 50 Hz (corner ground)
Size 4:
21 mA* AC at 230 V 50 Hz (3 phase, star point ground)
6.8 mA* AC at 230 V 50 Hz (1 phase, line to line supply, star point ground)
30 mA* AC at 230 V 50 Hz (1 phase, line to neutral supply, star point ground)
50 mA* AC at 400 V 50 Hz (3 phase, star point ground)
*Proportional to the supply voltage and frequency.
With internal filter removed:
Size 1: <1.5 mA (line to line supply, star point ground)
<1 mA (line to neutral supply, star point ground)
Size 2: <1.7 mA (line to line supply, star point ground)
<1.9 mA (line to neutral supply, star point ground)
Size 3: <3.3 mA (star point ground)
<4.9 mA (corner ground)
Size 4: < 3.5 mA (star point ground)
4.3.1 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
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.
When the internal filter is installed the leakage current is high. In this case a permanent
fixed ground connection must be provided, or other suitable measures taken to prevent a
safety hazard occurring if the connection is lost.
When the leakage current exceeds 3.5 mA, 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
connections to facilitate this. Both ground connections are necessary to meet EN 61800-
5-1: 2007.
Only type B ELCB / RCD are suitable for use with 3 phase inverter drives.
Unidrive M400 Quick Start Guide English Iss3.book Page 13 Wednesday, July 16, 2014 8:12 AM
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