Shenzhen Hpmont Technology Co., Ltd
Chapter 4 Electrical Installation
HD20 Series Inverters User Manual
―
29
―
Remarks:
•
All areas should be isolated in space to achieve electromagnetic decoupling effect.
•
The minimum distance between areas should be 20cm, and use earthing bars for decoupling
among areas, the cables from different area should be placed in different tubes.
•
EMI filters should be installed at the interfaces between different areas if necessary.
•
Bus cable (such as RS485) and signal cable must be shielded.
4.5.2 Wiring Requirement
In order to avoid interference intercoupling, it is recommended to separate the motor cables and
the control cables from power supply cables, and keep enough distance among the cables.
Especially when the cables are laid in parallel and the cable length is long, the signal cables
should cross the power supply cables perpendicularly as shown in Figure 4-16.
Figure 4-16 System wiring
Shielded/armoured cable: High frequency low impedance shielded cable should be used. For
example: copper net, aluminum net or iron net.
Normally, the control cables must use the shielded cables and the shielding metal net must be
connected to the metal enclosure of the inverter by cable clamps as shown in Figure 4-17.
Figure 4-17 Correct connection of the shielded cable
Motor cables
> 30cm
> 20cm
> 50cm
Power cables
Signal/control cables
Power or motor cables
Signal/control cables
Enclosure
PE
PE
Enclosure
4