Operating Instructions

Introduction
RFI Jumper
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● Do not remove the RFI jumper while the power is on.
● Removing the RFI jumper also cuts the capacitor conductivity of the surge
absorber to Ground and the built-in EMC filter capacitors. This voids compliance with
the EMC specifications.
● To maintain the efficiency of the EMC circuit, do not remove the RFI jumper if the
mains power is a symmetrically grounded power system.
● Remove the RFI jumper when conducting high voltage tests. When conducting a
high voltage test for the entire facility, 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, an ungrounded system, or a high impedance/ resistance
(greater than 30 Ω) grounded system.
● Remove the RFI jumper to disconnect the ground cable from the internal filter capacitor and surge absorber.
● Do not install an external RFI/EMC filter. The external EMC filter passes through a filter capacitor and connects
power input to the ground. This is very dangerous and damages the motor drive.
● In situations where EMC is required, use an EMC filter specifically for IT system if necessary. Disconnecting the
ground cable from the filter prevents damage to the motor drive but voids the guarantee of EMC compliance.
● In situations where EMC is required, check for 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 shielding.