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(5) Shield ground switch (LG)
For communication lines, use a coaxial cable.
As coaxial cable is an unbalanced circuit, ground its shield by
turning "ON" the shield ground switch.
Turn "ON" shield ground
switch
Setting
ON
OFF
Remarks
- Make sure to provide a class-3 grounding for the GND terminal of the power supply module.
Without grounding the power supply module, the JW-21MN 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-21MN, take out the coaxial cable from the JW-21MN
11
While the coaxial cable is connected to the JW-21MN, any electric welding nearby the JW-21MN
will cause the welding current to the JW-21MN and may damage part of its circuit pattern.
Turn "ON" shield
ground switch
Coaxial cable
Condition of the JW-21MN
Conductive between the shield and FG
of the JW20/JW20H/JW30H
Not conductive between the shield and
FG of the JW20/JW20H/JW30H
JW-21MN
Coaxial cable
Wrap around current
Note:
FG
Electric welder
Turn "ON" shield ground
switch
ON
OFF
(Factory setting: ON)
JW-21MN
Turn "ON" shield
ground switch
Rack etc.
Note: In case enough
conductivity is not
established.
11-4
4
C
(Rear side)
LG
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