Lenze SS208AC - Manual (Page 12)

SimpleServo 100/200 User Manual Rev 3.4
EMI PROTECTION
Electromagnetic interference (EMI) is an important concern for users of digital servo control systems. EMI
will cause control systems to behave in unexpected and sometimes dangerous ways. Therefore, reducing
EMI is of primary concern not only for servo control manufacturers such as AC Technology Corp, but the
user as well. Proper shielding, grounding and installation practices are critical to EMI reduction.
ENCLOSURE
The panel in which the servo is mounted must be made of metal, and must be grounded using the SPG
method outlined above.
Proper wire routing inside the panel is critical; power and logic leads must be routed in different avenues
inside the panel.
If you use drives that output over 8 amps, you must ensure that the panel contains sufficient clearance
above and below for the cooling fan to circulate air. Refer to Figure 3 for minimum suggested cooling air
clearance.
LINE FILTERING
In addition to EMI/RFI internal filter in the SimpleServo SS108AC/SS208AC, external filtering may be
required. High frequency energy can be coupled between the circuits via radiation or conduction. The AC
power wiring is one of the most important paths for both types of coupling mechanisms. There are many
AC line filter manufacturers whose filters can be successively integrated. AC Technology Corp
recommends Schaffner filters based on our test results.
HEAT SINKING
SimpleServos contain sufficient heat sinking in their basic configuration. There is no need for additional
heat sinking. However, drives that output more than 8 amps incorporate a heat sink cooling fan; you must
ensure that there is sufficient clearance for the cooling fan to circulate air (Figure 3). As a minimum, you
must allow an air gap of 1 inch above and below the drive.
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