Lenze PositionServo 940, User Manual

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S94P01B
13
EMC
Compliance with EN 61800-3/A11
This is a product of the restricted sales distribution class according to IEC 61800-3.
In a domestic environment this product may cause radio interference in which the
user may be required to take adequate measures
Noise emission
Drive Models ending in the suffix “2F” are in
compliance with class A limits according to
EN 55011 if installed in a control cabinet and
the motor cable length does not exceed 10m.
Models ending in “N” will require an appropriate
line filter.
Installation according to EMC
Requirements
E
D
B C
A
F
S930
A Screen clamps
B Control cable
C Low-capacitance motor cable
(core/core < 75 pF/m, core/screen < 150 pF/m)
D Earth grounded conductive mounting plate
E Encoder Feedback Cable
F Footprint or Sidemount Filter (optional)
4.2.2 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 Lenze, but the user as well. Proper shielding,
grounding and installation practices are critical to EMI reduction.
4.2.3 Enclosure
The panel in which the PositionServo 940 is mounted must be made of metal, and
must be grounded using the SPG method outlined in section 4.2.1.
Proper wire routing inside the panel is critical; power and logic leads must be routed in
different avenues inside the panel.
You must ensure that the panel contains sufficient clearance around the drive. Refer
to Section 3.2 suggested cooling air clearance.
4.3 Line filtering
In addition to EMI/RFI safeguards inherent in the PositionServo 940 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. In order to comply with IEC61800-3, an
appropriate filter must be installed within 20cm of the drive power inputs.
Line filters should be placed inside the shielded panel. Connect the filter to the
incoming power lines immediately after the safety mains and before any critical control
components. Wire the AC line filter as close as possible to the PositionServo 940
drive.