Famco MONT72 Series, Руководство пользователя

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Shenzhen Hpmont Technology Co., Ltd. Chapter 4 Electrical Installation
MONT72 Series User Manual V1.0 - 33 -
4.6.6 Conduction, Radiation, Radio Frequency Interference Countermeasures
EMI of the controller
The operating theory of controller means that some EMI is unavoidable. The controller is usually
installed in a metal cabinet which normally little affects the instruments outside the metal cabinet.
The cables are the main EMI source. If connect the cables according to this manual, the EMI can be
suppressed effectively.
If the controller and other control equipment are installed in one cabinet, the area rule must be
observed. Pay attention to the isolation between different areas, cable layout and shielding.
Reducing conducted interference
Add a noise filter to suppress conducted interference on the output side. Additionally, conducted
interference can be efficiently reduced by threading all the output cables through a grounded metal
tube. And conducted interference can be dramatically decreased when the distance between the
output cables and the signal cables is above 0.3m.
Reducing RF interference
The I/O cables and the controller produce radio frequency interference. A noise filter can be installed
both on the input side and output side, and shield them with iron utensil to reduce RF interference.
The wiring distance between the controller and the motor should be as short as possible shown in
Figure 4-23.
Figure 4-23 Reducing RF interference
4.6.7 Reactor
AC input reactor
The purpose of installing an AC input reactor: To increase the input power factor; To dramatically
reduce the harmonics on the input side at the high voltage point of common coupling and prevent
input current unbalance which can be caused by the phase-to-phase unbalance of the power supply.
DC reactor
The installation of a DC reactor can increase the input power factor, improve the overall efficiency and
thermal stability of controller, substantially eliminate the upper harmonics influence on performance
of controller, and decrease the conducted and radiated electromagnetic emissions from the controller.
AC output reactor
When the length of cable between controller and motor is more than 100m, it will cause leakage
current and controller tripping. It is suggested that user should consider installing an AC output
reactor.
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～ Controller EMI filter EMI filter
Metal tube Iron box
MCCB
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