Delta CFP2000 Series User Manual page 20

Pay particular attention to the following points:
 Do not remove the RFI jumper while the power is on.
 Removing the RFI jumper also disconnects the built-in EMC filter capacitors. Compliance with the
EMC specifications is no longer guaranteed.
 Do not remove the RFI jumper if the mains power is a symmetrical grounded power system in order to
maintain the efficiency for EMC circuit.
 Remove the RFI jumper while conducting high voltage tests. When conducting a high voltage test to
the entire facility, you must disconnect the mains power and the motor if the leakage current is too
high.
Floating Ground System(IT Systems)
A floating ground system is also called an IT system, ungrounded system, or high impedance/ resistance
(greater than 30 Ω) grounded system.
Disconnect the ground cable from the internal EMC filter.

In situations where EMC is required, check whether there is excess electromagnetic radiation

affecting nearby low-voltage circuits. In some situations, the adapter and cable naturally provide
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 capacitors, thus

connecting power input to ground. This is very dangerous and can easily damage the Power
Regenerative Unit.
1-11
Chapter 1 IntroductionCFP2000