V&T E5 Series User Manual page 35

3.6.4 Countermeasures for Conduction and Radiation Interference
Input filter
When the input noise filter is installed, the wire connecting the filter to the inverter input power

terminals shall be as short as possible.
The filter enclosure and mounting cabinet shall be reliably connected in large area to reduce the

back flow impedance of the noise current Ig.
The wire connecting the inverter and the motor shall be as short as possible. The motor cable

adopts 4−core cable, with the grounding end grounded at the inverter side, the other end
connected to the motor enclosure. The motor cable shall be sleeved into the metal tube.
The input power wire and output motor wire shall be kept away from each other as long as

possible.
The equipment and signal cables vulnerable to influence shall be kept far away from the inverter.

Main signal cables shall adopt shielded cable. It is suggested that the shielded layer shall be

grounded with 360−degree grounding method and sleeved into the metal tube. The signal cable
shall be kept far away from the inverter input wire and output motor wire. If the signal cable must
cross the input wire and output motor wire, they shall be kept orthogonal.
When frequency reference is analog voltage or current signals, shielded twisted pair cable shall be

used. The shielded layer shall be connected to the PE terminal of the inverter, and the signal cable
length should be less than 50m.
The wires of the control circuit terminals RATRBTRC and other control circuit terminals shall be

separately routed.
It is forbidden to short circuit the shielded layer and other signal cables or equipment.

When the inverter is connected to the inductive load equipment (e.g. electromagnetic contactor,

relay and solenoid valve), surge suppressor must be installed on the load equipment coil, as
shown in the following figure.
Inductive Inductive
load load
22
E5 Series High Performance Universal Inverter
Figure3−4 Noise current illustration
Inductive Inductive
load load
Figure3−5 Application of inductive load surge suppressor
Chapter 3 Electrical Installation
Inverter
User's Manual
Shielded
cable
Inductive Inductive
load load