18 Commander SK Getting Started Guide
www.controltechniques.com Issue Number: 9
4.3.3 Further EMC precautions
Further EMC precautions are required if more stringent EMC emission requirements
apply:
• Operation in the first environment of EN 61800-3:2004
• Conformity to the generic emission standards
• Equipment which is sensitive to electrical interference operating nearby
In this case it is necessary to use:
• The optional external EMC filter
• A shielded motor cable, with shield clamped to the grounded metal panel
• A shielded control cable, with shield clamped to the grounded metal panel
Full instructions are given in the Commander SK Technical Data Guide.
A full range of external EMC filters is also available for use with Commander SK.
4.4 Control terminals I/O specification
The control circuits are isolated from the power circuits in the drive by basic insulation
(single insulation) only. The installer must ensure that the external control circuits are
insulated from human contact by at least one layer of insulation (supplementary
insulation) rated for use at the AC supply voltage.
If the control circuits are to be connected to other circuits classified as Safety Extra Low
Voltage (SELV) (e.g. to personal computer), an additional isolating barrier must be
included in order to maintain the SELV classification.
The above warnings also apply to the PCB edge connector for the optional Solutions
Modules. To allow a Solutions Module to be installed with a Commander SK, a protective
cover must be removed to allow access to the PCB edge connector. See Figure 3-5 on
page 13. This protective cover provides protection from direct contact of the PCB edge
connector by the user. When this cover is removed and a Solutions Module installed, the
Solutions Module provides the protection from direct contact by the user. If the Solutions
Module is then removed, this PCB edge connector becomes exposed. The user is required
to provide protection in this case, to protect against direct contact of this PCB edge
connector.
See Pr 05 on page 26 (Drive configuration) for terminal connection / set-up diagrams and
details.
The digital inputs are positive logic only.
The analog inputs are unipolar. For information on a bipolar input, see the Commander
SK Advanced User Guide.
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