4-11
Chapter 4
Connection
G
ROUNDING
AND
C
ONNECTION
OF
I
NPUT
P
OWER
S
UPPLY
C
ONNECTION
C
HAPTER
4
4.3 Grounding and Connection of Input Power Supply
This section explains the procedure for performing grounding work, connecting the welding power
source and input power supply (power supply at facility side).
1.
Check that input power is turned off with the disconnect switch connected to the welding power
source.
2.
Perform grounding work for welding power source.
●
Grounding cable : AWG10 (5.3 mm
2
) with 10 mm
Φ
terminal × 1
⇒
The grounding cable is a striped pattern in yellow and green.
• When the welding power source is used in a humid environment such as construction
site, or location with highly conducting material such as steel plate or on steel structure,
install a leakage breaker.
Otherwise, electric shock due to leakage of electricity may occur.
• Be sure to install a switch with fuse or a circuit breaker (for motor) to the input side of
each welding power source.
Otherwise, electric shock and fire due to overcurrent or damage to the welding power
source may occur.
• If the welding power source which is not grounded is used, voltage will be generated in
the case through the capacitor between the welding power source input circuit and the
case or floating capacity (electrostatic capacity naturally generated between the input
conductor and the case metal). If you touch the case, you may suffer from electric
shock. Be sure to ground the case of the welding power source.
• Be sure to connect the input cable (3 pcs) in the correct position and securely tighten
them to the terminal block.
Improper connection may cause electric shock, fire and damage to the welding power
source.
Mount a switch with fuse or a circuit
breaker on each welding power source.
Green/Yellow cable for
grounding cable
Input cable
