Installation; Operation - ESAB LHJ 425 Instruction Manual

6) INSTALLATION

LHJ 425 it's a three-phase welding rectifier, to be connected across three input phases. The mains cable is
connected to the circuit breaker. The primary terminal is reconnectable for different input voltages (220, 380
or 440 V - 50/60Hz). The electrical diagram shows the different voltage connections procedures. Remove
the cover on the left panel and reconnect the terminal block as shown on the electric diagram on page 34.
Recommended cable areas and fuses ratings are listed below.
Connected the rectifier across three input phases and ground connection according to regulations.
TABLE 6.1
Voltage Primary current
(V)
for 60% duty cycle
220
380
440
IMPORTANT!: The grounding terminal is connected to the rectifier chassis. It
must to be connected to an efficient grounding point to the general power
supply system.

7) OPERATION

1) Connect the welding and return cable to the sockets at the bottom of the front panel.
2) Turn the circuit switch to "1" there by connecting the transformer to the mains - the pilot lamp lights up.
3) Make sure that the air inlets are not blocked.
4) Adjust desired welding current setting with the crank at the front panel.
Note: The welding parameters values basically depend on the material and
electrode diameter used, on the thickness of the piece of the to-be-weld piece
and the welding position.
Rating
(A) (KVA)
for 60% duty cycle
64 24.3
38 24.3
32 24.3
Fuse delay (A)
or
Circuit-breaker (A)
80
50
40
Cable
2
(mm )
3 x 16
3 x 10
3 x 10
LHJ 425
LHJ 425
17
17