Sharp JW-21MN User Manual

Page 57

11-4

F E

B A

(Factory setting: ON)

ON
OFF

(Rear side)

(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.

- 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

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.

Setting

Conductive between the shield and FG

of the JW20/JW20H/JW30H

Not conductive between the shield and

FG of the JW20/JW20H/JW30H

Condition of the JW-21MN

OFF

Remarks

Coaxial cable

JW-21MN

Turn "ON" shield
ground switch

Rack etc.

Note: In case enough

conductivity is not
established.

Electric welder

Wrap around current

Note:

Turn "ON" shield
ground switch

Coaxial cable

Turn "ON" shield ground
switch