Delta CT2000 Series User Manual page 8

enough suppression. If in doubt, install an extra electrostatic shielded cable on the power supply side
between the main circuit and the control terminals to increase security.
Do not install an external RFI/EMC filter, the EMC filter will pass through a filter capacitor, thus

connecting power input to ground. This is very dangerous and can easily damage the AC motor drive.
Asymmetric Ground System(Corner Grounded TN Systems)
 Caution: Do not cut the RFI jumper while the input terminal of the AC motor drive carries power.
 In the following four situations, the RFI jumper must be removed. This is to prevent the system from
grounding through the RFI capacitor, damaging the AC motor drive.
1 Grounding at a corner in a triangle configuration
3 Grounding at one end in a single-phase
configuration
Internal grounding through internal RFI filter, which reduces
electromagnetic radiation. In a situation with higher
requirements for electromagnetic compatibility, and using a
symmetrical grounding power system, an EMC filter can be
installed. As a reference, the diagram on the right is a
symmetrical grounding power system.
RFI jumper must be removed
2 Grounding at a midpoint in a polygonal
configuration
L 1
L 2
L 3
4 No stable neutral grounding in a three-phase
autotransformer configuration
L 1
N
RFI jumper can be used
1-5
Chapter 1 IntroductionCT2000 Series
L 1
L 2
L 3
L 1
L 2
L 3
L 1
L 2
L 3
L 1
L 2
L 3