Line Filtering Configurations For Controls - Watlow 945 Series User Manual

Line Filtering Configurations For Controls

These three diagrams show filter configurations for removing input power noise.
Choose the one best suited for your system. For very dirty or critical applications -
use a microcomputer-regulated power supply or Uninterruptable Power Supply
(U.P.S.). Don't fasten common mode line filters or filters with metal cases to metal
at ground potential. This prevents ground loops and maintains filter effectiveness.
2
2
Load
Line
Appendix
1
1
1
Noise Guidelines
1 NOTE:
Keep filters 12" (305
mm) or less from the
control. Minimize the
line distance where
noise can be reintro-
duced to the control.
Figure 37 -
Differential Mode
Filter Wiring
2 NOTE:
To prevent ground loops
do not fasten common
mode line filters or filters
with metal that is at
ground potential. Doing
so will reduce filter
effectiveness.
Figure 38 -
Common Mode Filter
Wiring
Figure 39 -
Combination
Differential/Common
Mode Filter Wiring
WATLOW Series 945 User's Manual
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