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HD65 & HD130 STEPPER DRIVES USER GUIDE 3
Where signal connections pass between units mounted in different
enclosures and separately energised from the mains, optical
isolation of all communication lines is recommended. It is still
desirable that all such isolated systems have their 0v rails directly
connected to earth.
Motor leads should be collectively screened if they run close to
power switching lines, particularly those driving unsuppressed
inductive loads. Whilst noise picked up on the motor leads is
unlikely to affect the motor directly, the noise gets coupled back into
the drive system and can cause problems as a result.
Contactors and relays feeding inductive loads should be adequately
suppressed.