Ground Leakage - Emerson Unidrive M101 Quick Start Manual

4.3

Ground leakage

The ground leakage current depends upon whether the internal EMC filter is installed or not. The
drive is supplied with the filter installed. Instructions for removing the internal filter are given in
section 4.5.1 Internal EMC filter on page 17.
With internal filter installed:
Size 1:
2.5 mA* AC at 230 V 50 Hz (line to line supply, star point ground)
9.2 mA* AC at 230 V 50 Hz (line to neutral supply, star point ground)
Size 2:
9.36 mA* AC at 110 V, 50 Hz (2 phase, line to line supply, star point ground)
16.4 mA* AC at 110 V, 50 Hz (1 phase, line to neutral supply, star point ground)
5.3 mA* AC at 230 V, 50 Hz (3 phase supply, star point ground)
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)
The above leakage currents are just the leakage currents of the drive with the internal
NOTE
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.
WARNING
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-
WARNING
5-1: 2007.
Unidrive M100-101 Quick Start Guide
Issue Number: 6
11