Installation Guide 13
Issue Number: 2 www.johnsoncontrols.com
Safety information Rating data Mechanical installation
Electrical installation
Operation Technical specifications UL listing information
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 reaches zero at
least once every half cycle)
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
4.3 EMC
4.3.1 Internal EMC filter
It is recommended that the internal EMC filter is kept in place unless there is a specific reason for
removing it.
It is recommended that the filter be used in all applications unless the ground leakage current is
unacceptable.
4.3.2 Removing the internal EMC filter
Removal of the internal EMC filter
Figure 4-3 Removal of the internal EMC filter
To disconnect the internal EMC filter:
1. Loosen the plate M3 nut
2. Loosen the PCB screw
3. Swivel the link to the position shown
4. Re-tighten M3 nut to 1Nm (8.9 lb in)
5. Re-tighten PCB screw to 1Nm (8.9 lb in)
Removal of the MOV varistor
A MOV (varistor) is installed between the power circuit and ground in order to protect the drive from
high voltage impulses caused by lightning etc. In some applications it may be necessary to
disconnect this device, depending upon the applicable regulations - for example if there is no fixed
ground connection.
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