Ground Leakage - Johnson Controls VFD66 Drive User Manual

Fuses/MCB
The AC supply to the drive must be installed with suitable protection against overload
and short circuits. Failure to observe this requirement will cause risk of fire.
WARNING
The drive must be grounded by a conductor sufficient to carry the prospective fault
current in the event of a fault. See also the warning in section 4.2 Ground leakage
relating to ground leakage current.
WARNING
Model
VFD66
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
3 Phase 200V drives
7.8mA AC maximum at 220V, 50Hz (proportional to supply voltage and frequency).
3 Phase 200V drives
10.4mA AC maximum at 400V, 50Hz (proportional to supply voltage and frequency).
The above leakage currents are the leakage currents of the drive with the Internal EMC
NOTE
filter connected. No account is taken for leakage currents of the motor or motor cable.
With internal EMC filter removed <1mA
There is an internal voltage surge suppression device connected to ground. Under
NOTE
normal circumstances, this carries negligible current.
When the internal EMC filter is installed, the leakage current is high. In this case, a
permanent fixed ground connection must be provided.
WARNING
4.2.1 Use of ground fault circuit interrupter (GFCI)
There are three common types of GFCI:
Type AC - detects AC fault currents
Type A - detects AC and pulsating DC fault currents (provided the DC current
Type 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
VFD66 User Guide
Issue Number: 2
Maximum power terminal screw torque
0.5 Nm / 4.4 lb in
reaches zero at least once every half cycle)
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