M-SS-017-07 Rev C
6
SERVO
STAR
CD
I
NPUT
P
OWER
F
ILTERING
The SERVO
STAR
CD electronic system components require EMI filtering in the input power leads to
meet the conducted emission requirements for the industrial environment. This filtering blocks conducted-
type emissions from exiting onto the power lines and provides a barrier for EMI on the power lines.
Care must be taken to adequately size the system. The type of filter is based on the voltage and current
rating of the system and whether the incoming line is single or three-phase. One input line filter is used for
multi-axis control applications. These filters are mounted as close to the incoming power as possible so
noise is not capacitively coupled into other signal leads and cables. Similarly, care should be taken when
routing wires from the load side of the filter to the BUS Module. These lines may be noisy and should be
separated from other sensitive cabling to avoid unwanted coupling of noise. Several manufacturers of
these filters are listed below. They should be able to recommend the best filter design for most typical
motor control applications. Danaher Motion has also provided specific filters recommendations that
adequately attenuate the conducted noise to levels well below the CE limits. The implementation of the
EMI filter should be done in accordance with the following guidelines:
— Filter should be mounted on the same panel as the drive and BUS Module.
— Filter should be mounted as close as possible to incoming cabinet power.
— Filter should be mounted as close as possible to BUS Module. If separation exceeds 30cm. (1 ft.), flat cable
(braid) is used for the high frequency connection between filter and BUS Module.
— When mounting the filter to the panel, remove any paint or material covering. Use an unpainted metallic back
panel, if possible.
— Filters are provided with an earth connection. All ground connections are tied to ground.
— Filters can produce high leakage currents.
Filters must be earthed before connecting the supply!
— Filters should not be touched for a period of 10 seconds after removing the supply.
BUS Module Model #
Recommended EMI Line Filter
Danaher Motion Part #
PALM
*
Corcom F7202A
A-97181
Cx03
Filter Concepts SF7
Schaffner FN258-7/07
n/a
A-96776-001
Cx06
Filter Concepts SF15
Schaffner FN258-16/07
n/a
A-96776-002
Cx10
Schaffner FN258-16/07
A-96776-002
*PALM is not used for Series 5 (Version 2)
NOTE
The filters called out in the table on the previous page are used on a one-to-one
corresponedence with the drive. If drives are paralled off one filter, it needs to be sized.
Drives can be ganged off one EMI filter as shown in the Filter and Bonding Diagrams.
M
OTOR
L
INE
F
ILTERING
Motor filtering may not be necessary for CE compliance of SERVO
STAR
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.
Refer to the
Installation Manual
for details.
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