4.6 Electromagnetic Interference Suppression
4.6.1 CE filtering technology
The CDHD2S drive complies with the CE standards specified in the Standard Certification.
Proper bonding, grounding and filtering techniques must be used to meet this standard.
There are usually two types of noise current. The first is conductive noise emission through the
ground loop. The quality of the system grounding is inversely proportional to the line noise
amplitude. These conducted emissions have a common mode characteristic from line to neutral
point (or ground). The second is radiation high-frequency noise emission, which is usually line-to-
line capacitive coupling and it is specific in nature.
To properly install an EMI filter, the enclosure should have an unpainted metal surface. This
leaves more surface area in contact with the filter housing and provides a lower impedance path
between that housing and the backplane. In turn, the backplane has a high-frequency ground bus
connection to the enclosure or ground.
4.6.2 Grounding
When connecting the CDHD2S to other control devices, be sure to follow two basic guidelines
to prevent damage to the drive:
⚫ The CDHD2S must be grounded via the ground wire of the AC mains power supply.
⚫ Any drive controller, PLC or PC connected to the CDHD2S must be connected to the
same ground wire as the CDHD2S.
Figure 4-12 CDHD2S system grounding
System grounding is critical to the operation of the drive system.
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