Rockwell Automation 2090-UCSR-A300 300 W Active Shunt Regulator - Manual (Page 9)

Publication 2090-IN002C-EN-P — June 2007
300 W Active Shunt Regulator 9
ULTRA 100 Radiated
Emissions CE Compliance In order for the ULTRA 100 drive to comply with the CE radiated emissions
standards, ferrites must be added to the ends of the twisted dc bus wires when
using an active shunt. Route both wires through the ferrites. Ferrites with an
impedance at 100 MHz between 100
to 200 Ω were found to be effective. The
following table lists some readily available ferrites with effective impedance
ratings.
Figure 6
DC Bus Wiring Layout Using Ferrites with Shielded Cable
Ferrites for CE Radiated Emissions Compliance
Mfg. Part/No. D E Impedance
SS28B2034 0.250 0.120 125
Ω
SS28B2037 0.350 0.200 154
Ω
SS28B2032 0.500 0.200 230
Ω
Box-shaped ferrite assembly in fully enclosed
nylon case. End ports are surrounded with
flexible spring flutes to grip a range of cable
diameters from 3.2...12.7 mm (0.125...0.500 in.).
FerriShield, Inc.
350 Fifth Avenue, Suite 7310
New York, NY 10118-7591
A
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Adjust
Overtemp
DC Bus
Active
Active Shunt
2 2
• Place shunt in metal enclosure providing EMI noise
reduction.
• For ULTRA 100 drive only:
Install a 100 to 200 W ferrite RFI suppressor at both ends
of the dc bus wires to comply with CE radiated
emissions standard.
• Some drive terminals are marked R, S, and T instead of
U, V, and W.