hpmont HD5L-PLUS Series User Manual

Chapter 4 Electrical Installation Shenzhen Hpmont Technology Co., Ltd.
32 HD5L-PLUS Series User Manual V1.0
4.6.4 Ground Connection
The controller has leakage current to the ground. The grounding terminal PE must be grounded, and it
is as close as possible to the grounding point, the grounding area is as large as possible, and the
grounding resistance value is less than 10Ω.
Do not share the grounding wire (A) with other power equipment. The grounding electrode (C) can be
shared, but each has a dedicated grounding electrode (B) for the best effect, as shown in Figure 4-23.
Figure 4-23 Grounding method
When using more than one controller, be careful not to loop the ground wire as shown in Figure 4-24.
Figure 4-24 Prohibited grounding method
4.6.5 EMI Filter
The EMI filter should be used in the equipment that may generate strong EMI or the equipment that is
sensitive to the external EMI. The EMI filter is a dual-way low pass filter through which lower frequency
current can flow while higher frequency current can hardly flow.
Function of EMI Filter
1. The EMI filter ensures the equipment not only satisfy the conducting emission and conducting
sensitivity in EMC standard but also can suppress the radiation of the equipment.
2. It can prevent the EMI generated by equipment from entering the power cable and the EMI
generated by power cable from entering equipment.
Common Mistakes in Using EMI Filter
1. Too long the power cable is between the EMI filter and the controller.
The filter inside the cabinet should be located near to the input power source. The length of the power cables
should be as short as possible.
2. Too close the input and output cables of the EMI filter.
The distance between input and output cables of the filter should be as far apart as possible. Otherwise the
high-frequency noise may be coupled between the cables and bypass the filter. Thus, the filter will become
ineffective.
3. Bad grounding of the EMI filter
The enclosure of EMI filter must be grounded properly to the metal case of the controller. In order to achieve
better grounding effect, make use of a special grounding terminal on the enclosure. If using one cable to
connect the filter to the case, the grounding is useless for high frequency interference. When the frequency is
high, so is the impedance of cable, hence there is little bypass effect.
The correct installation: The filter should be mounted on the enclosure of equipment. Ensure to clear away
the insulation paint between the filter case and the enclosure for good grounding contact.
Controller
Other Co
ntroller
PE PE
A. Sharing grounding wire
PE PE
B. Dedicated grounding pole
PE PE
C. Sharing grounding pole
Other Co
ntro
lle
r Other
Controller Controller Controller Controller
PE
PE
PE PE
Prohibited grounding method

hpmont HD5L-PLUS Series Specifications

General

Brand	hpmont
Model	HD5L-PLUS Series
Category	Controller
Language	English