Emerson SKCD200220 - Ground Leakage and EMC Filter Management

16 Commander SK Getting Started Guide
www.controltechniques.com Issue Number: 9
4.2 Ground leakage
The ground leakage current depends upon the internal EMC filter being installed. The
drive is supplied with the filter installed. Instructions for removal of the internal EMC filter
are given in section 4.3.2 Removing the internal EMC filter .
With internal EMC filter installed
30 μ A DC (10M Ω internal bleed resistor, relevant where DC leakage current is being measured)
Size A
1 phase 110V drives
4mA AC maximum at 110V, 50Hz (proportional to supply voltage and frequency)
1 phase 200V drives
10mA AC maximum at 230V, 50Hz (proportional to supply voltage and
frequency)
Size B
1 phase 110V drives
10mA AC maximum at 110V, 50Hz (proportional to supply voltage and
frequency)
Size B and C
1 phase 200V drives
20mA AC maximum at 230V, 50Hz (proportional to supply voltage and
frequency)
3 phase 200V drives
8mA AC maximum at 230V, 50Hz (proportional to supply voltage and
frequency)
3 phase 400V drives
8.2mA AC maximum at 415V, 50Hz (proportional to supply voltage and
frequency)
Size D
1 phase 200V drives
20.5mA AC maximum at 230V, 50Hz (proportional to supply voltage and
frequency)
3 phase 200V drives
8mA AC maximum at 230V, 50Hz (proportional to supply voltage and
frequency)
3 phase 400V drives
10.5mA AC maximum at 415V, 50Hz (proportional to supply voltage and
frequency)
With internal EMC filter removed
<1mA
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.
NOTE
In both cases, there is an internal voltage surge suppression device connected to
ground. Under normal circumstances, this carries negligible current.
NOTE
When the internal EMC filter is installed, the leakage current is high. In this case, 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 terminals to facilitate this. The purpose is to prevent a safety
hazard occurring if a connection is lost. Both ground connections are required to meet
the required european standard.
WARNING