6
PKC SERIES PACKAGED STEPPER DRIVES USER GUIDE
General
Wiring and
Earthing
Recommen-
dations
Input/output signal connections longer than about 500mm should use
wires having a collective or individual screen. Route signal
connections separately from power and motor connections. If the
motor leads run in the same trunking as signal leads, then either the
motor or signal leads should be screened. Connect the screen to the
earth stud at one end, and insulate it at the remote end.
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. In general it is preferable to keep power
connections, motor leads and control signal connections separate as
far as possible. Where it is unavoidable to run motor leads in the
same trunking as control signal leads, either the motor leads or
signal leads should be screened. Connect the screen to earth at one
end, and insulate it at the remote end. In any event, control signal
connections longer than about 500mm (20") are best made using
wires having a collective or individual screen.
Contactors and relays feeding inductive loads should be adequately
suppressed.
100 OHM, 0.1uF @ 600V
Cs
L
R
CONTACTS
INDUCTIVE
LOAD
AC OR
DC
SUPPLY
SUPPLY
DC
-
+
LOAD
INDUCTIVE
CONTACTS
R
L
D1
Rs
Figure 2-1. Typical Suppression Circuits
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