Installation manual

Danaher Motion Kollmorgen Wiring
SERVOSTAR
®
S and SERVOSTAR
®
CD Series 18
Motor Line Filtering
Motor filtering may not be necessary for CE compliance of SERVOSTAR
systems. However, this additional filtering increases the reliability of the system.
Poor non-metallic enclosure surfaces and lengthy, unbonded (or unshielded)
motor cables that couple noise line-to-line (differential) are just some of the
factors that lead to the necessity of motor lead filtering.
Motor lead noise may be either common-mode or differential. The common-
mode conducted currents occur between each motor lead and ground (line-to-
neutral). Differential radiated currents exist from one motor lead to another
(line-to-line). The filtering of the lines feeding the motor provide additional
attenuation of noise currents that enter surrounding cables and equipment I/O
ports in close proximity.
Differential mode currents commonly occur with lengthy motor cables. As the
cable length increases, so does its capacitance and its ability to couple noise
from line-to-line. While every final system is different and every application of
the product causes a slightly different emission profile, it may become necessary
to use differential mode chokes to provide additional noise attenuation to
minimize the radiated emissions. The use of a ferrite core (placed at the drive
end) on each motor lead (shown in the diagram below), attenuates differential
mode noise and lower frequency (30-60 MHz) broadband emissions to within
specifications. Danaher Motion Kollmorgen recommends a Fair-Rite P/N
2643665702 (or equivalent) ferrite core. You should wrap each motor lead
through the core several times, as shown in the next figure.
Never wrap a ground lead through a core.
V
From Drive
To Motor
Common Mode
Filtering
From Drive Output
To motor
Differential Mode Filtering