2-18
Installation
P/N 0013-1027-005 Rev A
In the case of servo drives, reducing the EMI source requires slowing power semiconductor
switching speeds. However, this adversely affects drive performance with respect to heat dis-
sipation and speed/torque regulation. Hardening the victim equipment may not be possible or
practical. The final, and often the most realistic solution is to reduce the coupling mechanism
between the source and victim. This can be achieved by filtering, shielding and grounding.
Filtering
As mentioned above, high frequency energy can be coupled between circuits via radiation or
conduction. The AC power wiring is one of the most important paths for both types of coupling
mechanisms. The AC line can conduct noise into the drive from other devices, or it can conduct
noise directly from the drive into other devices. It can also act as an antenna and transmit or
receive radiated noise between the drive and other devices.
One method to improve the EMC characteristics of a drive is to use an isolation AC power
transformer to feed the amplifier its input power. This minimizes inrush currents on power up
and provides electrical isolation. In addition, it provides common mode filtering, although the
effect is limited in frequency by the interwinding capacitance. Use of a Faraday shield between
the windings can increase the common mode rejection bandwidth, (shield terminated to ground)
or provide differential mode shielding (shield terminated to the winding).
An alternative is to use AC line filters to reduce the conducted EMI emitting from the drive.
This allows nearby equipment to operate undisturbed. In most cases an AC line filter will not
be required unless other sensitive circuits are powered off the same AC branch circuit. The basic
operating principle is to minimize the high frequency power transfer through the filter. An
effective filter achieves this by using capacitors and inductors to mismatch the source impedance
(AC line) and the load impedance (drive) at high frequencies.
For Electro-Craft drives brought into use in Europe, the use of the correct filter is essential to
meet emissions requirements. Detailed information on filters is included in the drive specific
document. Transformers should also be used as specified in the drive manual.
The following table shows suitable filter types for Electro-Craft products. The filters identified
are manufactured by Schaffner or Roxburgh and are widely available from commercial sources.
Filters manufactured by Rasmi have also been tested successfully for EU compliance. There are
many AC line filter manufacturers whose products could be successfully integrated. One man-
ufacturer cannot be recommended over another manufacturer. The machine builder is
responsible for the suitability of the filter selection in a specific application. Further information
is available from the manufacturers.
TIP
“Common mode” noise is present on all conductors referenced to ground. “Dif-
ferential mode” noise is present on one conductor referenced to another
conductor.
T
ABLE
2.3
Suitable AC Line Filter Types
Electro-Craft Drive/
Power Supply
Roxburgh
Part Number
Schaffner
Part Number
Single phase drives
MIF xx or MDF xx
FN 350-xx
Three phase drives
MIF3xx or MDF 3xx
FN 351-xx
Rockwell Automation stocks some Roxburgh filters, but does not offer
low current single phase filters. Most applications are multiple axis
such that multiple drives may be connected to a filter (e.g. MDF xx)
with higher current rating.
Manufacturer phone numbers:
Roxburgh 01724-281770 (011-44-1724-281770 from USA), and
Schaffner (1-800-367-5566).
Содержание IQ 2000
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