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3 -
Figure
Differential Mode
Filter
Wiring
NOTE: Keep filters
12 inches or less
from the control.
Minimize
the line
distance where
nolse can be re-
introduced to
control.
Common Mode Filter
Wiring
2
NOTE: To prevent
ground loops do not
common
fasten
mode line filters or
filters with metal
cases to metal that
is at ground poten-
tlal. Doing so will
reduce filter effec-
tiveness.
Figure 5 -
Combination
Differential/
Common Mode Filter
Wiring
10 WATLOW Series 980/985 User's Manual
Line Filtering Configurations For Controls
These three diagrams show you filter configurations for removing input power
noise. Choose the one best suited for your system. For very dirty or critical
applications - use
microcomputer-regulated power supply or Uninterruptable
a
Power Supply (U.P.S.) Don't fasten common mode line filters or filters with
metal cases to metal that is at ground potential. This prevents ground loops
and maintains filter effectiveness.
D.M. Line Filter
Ll
.
Line
C.M.
Ground
Filter
Control
Control
I
Control
Install and Wire, Chapter 2
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