Operating Instructions

SED2 Operation & Maintenance Manual Addendum
174 Siemens Building Technologies, Inc.
Appendix C: Electrical Installation
EMC-Compatibility
NOTE: The Siemens Building Technologies SED2 Variable Frequency Drives are
shipped without EMC line filters. (The EMC filter is most commonly used in
Europe.) Where local codes or customer/installation requirements dictate,
separately orderable line filters are available. More stringent Class B line filters
are also available for most models. Installation of these filters satisfies the
requirements for the EU's EMC directive.
Installation
The SED2 operates in environments where they may be exposed to high levels of
electromagnetic interference (EMI). Normally, good installation practices ensure safe and
interference-free operation. However, should problems associated with EMI occur, follow
these guidelines:
• Ensure good electrical contact between the mounting plate and the metal housing of
the SED2 via the mounting screws.
• Use serrated lock washers and electrically conductive mounting plates.
• If a footprint EMC filter is used, fit it under the SED2 and ground it via the metal
backplate. When connecting the EMC filter to the inputs of the SED2, use shielded
cables, and ensure that they are correctly grounded using cable clamps (Figure 40).
Wiring
• Ensure that all equipment in the control cabinet is properly grounded. Connect all
equipment by short, thick grounding conductors to a common grounding point or bus
bar.
• Ensure that any control equipment connected to a SED2 (such as PLC or BACS,
programmable logic controller or building automation and control system) connects
with a short, thick cable to the same ground or grounding point as the SED2.
• Use shielded cables inside control cabinets. Use only shielded motor and control
cables. The shielding must be continuous. Connect motor and control cables to
ground at both ends. Avoid pigtails. Use only grounding clamps to bond the shield
(Figure 40).
• Lay control, mains, and motor cables separately by routing them in separate cable
ducts and maintaining a minimum clearance of 7.8 inches (200 mm). See Figure 41.
If you cannot avoid crossing cables, run them at a 90-degree angle.