Appendix A
04/06
Danaher Motion
Machine builder is responsible for machine EMC compliance
CAUTION
Because applications differ it is impossible for the
drive manufacturer to guarantee machine EMC
compliance. In some applications it may be
necessary for the machine builder to incorporate
more EMC mitigation techniques than Danaher
Motion had to use in the EMC test setups
described in section A.2.1.
General suggestions to improve the EMC performance of the machine:
•
When designing cables care should be taken to ensure that the
cables are well shielded and bonded to reduce RF emissions.
•
When joining or splicing sections of cable be sure to maintain the
integrity of the cable shield along the entire length of the finished
cable.
•
Separate cables according to type - AC Mains input, motor power
and signal cables should be separated from each other by at least
100 mm (4 in) to avoid cross coupling between them. If cables of
different types have to cross, they should do so at a 90
°
angle.
•
Route wiring close to machine frame - It is a good practice to run
wires along the machine frame (local ground) whenever practical,
this couples some high frequency noise/signals that could
otherwise be troublesome directly to the local ground.
•
Remove paint from all line filter, and cable clamp mounting
locations.
•
Add clamp-on ferrites to cables – Adding clamp-on ferrites to
noisy cables can reduce emissions by absorbing RF energy
before it is radiated.
•
Use the appropriate line filter – A line filter is required for CE
applications.
•
Add a balun to the motor power cable – adding a balun in series
with the phases of the motor power cable can attenuate both
conducted and radiated emissions.
•
Ensure that cables shields have a good RF ground.
A.1.6
AC MAINS – CONDUCTED EMISSIONS
Line filter
To meet the CE conducted EMC requirements an external line filter in series
with the AC mains is necessary. It is the responsibility of the machine
builder to choose filter(s) appropriate for the application, Danaher Motion is
willing to assist in this choice. Often the decision is made to filter the
machine as a whole instead of filtering the individual drives.
The line filter should be mounted as close as possible to the point where
incoming power enters the machine/cabinet. The drive(s) should be located
as close as possible to the line filter. To provide maximum high frequency
filtering remove any paint from between the filter, the drive and the
conductive surface, ground plane they are bonded to. Input wiring to the line
filter and output wiring from the line filter should be separated from each
other for maximum benefit.
46 Rev
D
M-SD-7AC-01