Page C–6 Stellar
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SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
Appendix C: Electromagnetic Compatibility
C.7.7 – sTraTegies for aTTaining and mainTaining emC ComplianCe
Where possible, minimize the effect of electrical interference by using the strategies listed
below.
•
Locate the SR55 Soft Starter unit as close as reasonably possible to the motor terminal box in
order to minimize cable length�
•
Ensure that, within any enclosure, the control wiring does not run parallel to the power wiring�
Where this is unavoidable, maintain a 100 mm [3�9 in] separation between control cables and
power cables�
•
Where possible, ensure that the control wiring crosses at right angles to the power wiring�
This practice reduces the cross-coupling between cables�
•
Shield any cables carrying sensitive signals� The digital control inputs to a SR55 are
opto-isolated, and do not normally require buffering (e�g� through a small relay) or shielding�
Where a special purpose system filter has been applied at the point of common coupling,
additional filtering of individual drives is not necessary and may introduce undesirable effects
due to resonance.
For the purposes of EMC, the connections between the SR55 controller and motor are
considered to be an extension of the enclosure, and preferably should be contained within
grounded metallic trunking or conduit. Armored cable may be used providing it is correctly
terminated, although the EMC performance will be slightly inferior. Shielded cable is not
necessary.
All associated electrical and electronic equipment near to the controller complies with the
emission and immunity requirements of the EMC Directive.
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