Watlow Series 920 Microprocessor-Based Ramping Control - Manual (Page 23)

Keep filters 12
inches (304.8mm) or
less from the
control. Minimize
the line distance
1
where noise can be
Ll
L2
Ground
D.M. Line Filter
Control
Ll
C.M. Line Filter
L2
Line Load
Ground
w-introduced to the
control.
Figure 9 -
Differential Mode
Filter Diagram.
Figure I0 -
Common Mode
Filter Diagram.
To prevent ground
loops, do not fasten
common mode line
filters or filters with
metal cases to metal
that is at ground
potential. Doing so
will reduce filter
effectiveness.
D.M.
Line Filter
C.M.Line Filter
Control Figure 11 -
Combination
Differential-Common
Mode Filter Diagram.
WATLOW Series 920 User’s Manual 23