Watlow Series 922 - Manual (Page 25)

How to Install and Wire, Chapter 4 25 WATLOW Series 922 User's Manual
Control
Shield
C.M. Line
Filter
D.M. Line
Filter
Line Load Line Load
MOV
L1
L2
Ground
Wiring Guide
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 if you are unsure which one
to use. For very "dirty" or critical application -use microcomputer-regulated
power supply or Uninterruptable Power Supply (U.P.S.)
Figure 9 -
Differential Mode
Filter Diagram
Figure 10 -
Common Mode
Filter Diagram
Figure 11 -
Combination
Differential-Common
Mode Filter Diagram
NOTE : To prevent
ground loops, do
not fasten common
mode line filters or
filters with metal
cases to metal that
is at ground poten-
tial. Doing so will
reduce filter effec-
tiveness.
NOTE : Keep filters
12 inches or less
from the control.
Minimize the line
distance where
noise can be
reintroduced to
control.
Control
Shield
D.M. Line Filter
Line Load
L1
L2
Ground
Control
Shield
C.M. Line Filter
Line Load
L1
L2
Ground