15
4 Wiring
WARNING
• Ground resistance must be 100Ω or less.
The regulation specifies that the ground resistance must be 100Ω or less when the welder is used with
power supply voltage 200 V.
Failure to observe this warning may result in charging the case or unstable operations when the welder is
not installed.
• Before wiring, be sure to turn the primary power supply OFF, and put up a warning sign. (ex.
DO NOT TURN THE POWER ON.)
Failure to observe this warning may result in fire or electric shock.
CAUTION
• Wiring must be performed by authorized or certified personnel.
Failure to observe this caution may result in fire or electric shock.
4.1 Grounding
Ground terminal (crimp terminal) is provided at the lower part of the rear face of the
welder for safe operation.
Follow the local regulations for ground line size.
Connect the ground wire of 14 mm
2
or more to the terminal which is specified as ground
terminal. (Refer to “Fig. 4.1 Connection at the Rear Face.”)
If there is a pool or pond between the power supply switch gear ground and the welder
ground so that the leak current is concentrated into the pool or pond, not only ground them
but also connect both grounds with cable to make any leak current flow in the cable.
■ Grounding of Base Metal
Be sure to ground the base metal at resistance of 100Ω or less, even when a base such as
lumber is floated.
As shown in “Fig. 4.2 Connection at Front Face,” be sure to connect the base metal to the
positive side output terminal of the welder and ground base metal at resistance of 100Ω or
less individually. If it is not grounded, voltage may be generated in the base metal
resulting in electric shock.
Connect the welder and the base metal with exclusive-use base metal cable.
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