Sharp JW-20CM - Manual (Page 118)

9 · 20
From the previous page
Set LG (shield ground) switch
· For communication lines, use a coaxial cable.
· As coaxial cable is an unbalanced circuit,
ground its shield by turning “ON” the shield
ground switch.
• Make sure to provide a class-3 grounding for the GND terminal of the power module. Without
grounding the power module, the JW-20CM cannot become conductive with the ground after
turning “ON” the shield ground switch. (See page 7 · 2.)
• Prior to any electric welding around the JW-20CM, take out the coaxial cable from the JW-20CM.
While the coaxial cable is connected to the JW-20CM, any electric welding nearby the JW-20CM
will cause the welding current to the JW-20CM and may damage part of its circuit pattern.
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Coaxial cable
Turn “ON” shield ground
switch Turn “ON” shield ground
switch
Coaxial cable
JW-20CM
Turn “ON”
shield ground
Rack etc.
Electric welder
Note: In case enough
conductivity is not
established.
JW-20CM
Turn “ON”
shield ground
JW-20CM has a
fuse element here
Wraparound current
FG FG