Watlow Electric Ramping and Profiling Microprocessor-Based Control SERIES 1500 - Manual (Page 31)

Installation-Wiring
Installation - Wiring, Chapter 3
WATLOW Series 1500 User's Manual 31
Noise Suppression Devices Available from Watlow
Watlow Winona stocks a few key noise suppression parts. You may order these by
calling your local Watlow distributor.
Item Electrical Ratings Part Number
Common Mode Line Filter 250V, 3 Amp 0804-0196-0000
Differential Mode Line Filter Refer to the islatrol listing above.
Metal Oxide Varistor 150V, 80 Joule 0802-0273-0000
MOV 130V, 38 Joule 0802-0304-0000
MOV 275V, 75 Joule 0802-0266-0000
MOV 275V, 140 Joule 0802-0405-0000
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, see
Figure 12.
For very dirty or critical application - use micro-computer-regulated power
supply or Uninterruptable Power Supply (U.P.S.)
Line Load
L2
L1
Ground
Control
k
1
D.M. Line Filter
Shield
C.M. Line Filter Line Load
L2
L1
Ground
k
1
D.M. Line Filter
k
2
mov
Line Load
L2
L1
Ground
Control
k
1
C.M. Line Filter
k
2
Shield
Figure 10 -
Differential Mode
Filter Diagram
Figure 11 -
Common Mode
Filter Diagram
Figure 12 -
Combination
Differential-
Common Mode
Filter Diagram
1
Keep filters 12
inches or less from
the control. Mini-
mize the line
distance where
noise can be re-
introduced to
control.
2
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.
Table 4 -
Noise Suppres-
sion Device
Ratings