Rockwell Automation AK DBU - Dynamic Braking Unit 600/690 VAC - Manual (Page 33)

CE Conformity B-3
Cabinet Mounted Drives (see Figure B.2 )
If the drive related components are mounted in a cabinet, the following
rules must be observed:
• If located in a common cabinet, all drive related components must be
screwed directly to a blank (non painted) panel with good
conductivity and the largest possible contact area.
• The support panel for the DBU and an inverter with filters must be a
conducting steel sheet with a common ground bus bar located at the
bottom of the support panel. This ground bus bar, must be solidly
connected to the panel to ensure good conductivity.
• All cable screens for cables entering the cabinet must be solidly
connected to the cabinet’s ground bus bar or to the ground stud of the
inverter with a large connection area and good conductivity to ensure
that the grounding represents a low impedance for HF signals.
• Either galvanized cable brackets or EMC cable glands are required.
Standalone Drives and Related Components (see Figure B.3 )
• If the drive and related components (inverter, RFI-Filter, DBU and
brake resistor) are mounted in separate enclosures, these must be of
conductive metallic material in which the diameter of ventilation
holes should not exceed 6 mm (0.24 in).
• The spacing between brake resistor assembly and the enclosure wall
shall be 100 mm (4 in) minimum.
Mounting Instructions