Lenze IMSS500+ Simple Servo 500 600 i1000 - Manual (Page 18)

SimpleServo 500/600/i1000 User Manual Rev 3.4
4.4 Shielding and grounding
4.4.1 General guidelines
AC Technology Corporation recommends the use of single-point grounding (SPG) for panel-mounted
controls. Serial grounding (a “daisy chain”) is not recommended. The SPG for all enclosures must be tied
to earth ground at the same point. The system ground and equipment grounds for all panel-mounted
enclosures must be individually connected to the SPG for that panel using 14 AWG (5.5 mm) or larger
wire. Refer to Figure 6 for wiring guidelines.
In order to minimize EMI, the chassis must be grounded to the mounting panel (Figure 6). Use 14 AWG
(1.6 mm) or larger wire to join the enclosure to earth ground. A lockwasher must be installed between the
enclosure and ground terminal. To ensure maximum contact between the terminal and enclosure, remove
paint in a minimum radius of 0.25 in (6 mm) around the screw hole of the enclosure.
AC Technology Corporation recommends the use of the special SimpleServo cables provided by AC
Technology Corporation. If you specify cables other than those provided by AC Technology Corporation,
please make sure all cables are shielded and properly grounded.
It may be necessary to earth ground the shielded cable (Figure 6). Ground the shield at the SimpleServo
end and at the motor end.
If the SimpleServo continues to pick up noise after grounding the shield, it may be necessary to add an
AC line filtering devices and/or an output filter (between drive and servo motor).
4.4.2 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 Corporation,
but the user as well. Proper shielding, grounding and installation practices are critical to EMI reduction.
4.4.3 Enclosure
The panel in which the SimpleServo 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.
4.5 Line filtering
In addition to EMI/RFI safeguards inherent in the SimpleServo design, 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 Tech recommends Schaffner filters
based on our test results.
18