Power Supply - ESAB LHI 425 Manual De Instrucciones

6.3) Power supply

The requisites for voltage supply are indicated in the nominal board. LHI 425 Pipeweld is designed to
operate with three-phase 220, 380, 415 or 440 V in 50/60 Hz.They must have an independent feeding line
with full capacity to assure its best performance and reduce possible welding failures or damage caused by
other equipment such as resistance welding machines, impact presser or electrical engines, etc.
For power supply of a LHI 425 Pipeweld the operator can use the input cable (4 conductors - 3 feeders and 1
grounding) or another one similar links with desired length. In any situation power supply must be through a
properly dimensioned exclusive switch with protection fuses or circuit breakers.
Table below gives information for dimensioning cables and line fuses; eventually consult with local rules.
TABLE 6.1
Model
LHI 425
Pipeweld
LHI 425 Pipeweld is supplied to operate from a 440V input .In case your input is different, primary
connections must be changed as indicated in the electrical diagram. Removal of right side window gives
direct access to terminal bars of primary connections.
The grounding terminal is connected to the RECTIFIER chassis. It must
be connected to an efficient grounding point of the general power
supply system. DO NOT connect the grounding conductor of the input
cable to any of the terminals of the ON/OFF switch, which would put the
machine chassis under electrical tension.
All electrical connections must be firmly tightened to avoid sparking risks, overheating or circuit voltage
drop.
The permissible system impedance of the supply, to which the power source is intended to be connected,
shall be equal to or less than 0,0973 Ohm. It is recommended to consult the supply authority in the
evaluation of the actual supply system.
22
LHI 425 Pipeweld
Voltage Consume at
(V - Hz) 60% Duty Cicle
220
380
415
440
NOTE: DO NOT USE THE NEUTRAL OF THE POWER SUPPLY
SYSTEM FOR GROUNDING .
Conductors
(copper - mm )
75
47
43
40
IMPORTANT !
Fuses
2
(A)
10 90
10 60
10 60
10 50