Power Supply; Important - ESAB LHI 825 Manual Del Usuario Y Repuestos

4.4

Power supply

The power supply voltage requirements are indicated in the nominal board.
RECTIFIERS are projected to operate in a three-phase main power supply of 220/380/415/440 -
in 50/60 Hz.
It should be fed from an independed main supply of adequate capacity, in order to guarantee its
perfect performance and to reduce welding faults and eventual damage caused by other
equipment, such as resistant welding machine, electric engines, etc.
For electric feeding of a LHI RECTIFIER, the user can use the input cable supplied 4 conductors
(3 feeding cables and 1 earth cable) or an appropriate cable with correspondent bifool of desired
length and with 4 conductors (3 feeding conductors and 1 earth conductor).
In all the cases above, the electric feeding should be done with a exclusive switch with protective
fuses or circuit breaker properly dimensioned.
The chart 4.1 below gives dimension guide lines of line fuses cases, otherwise check the
regulations on force.
TABLE 4.1
Model
LHI 825
The LHI RECTIFIER is supplied to connect in a 440 V main power supply. In case the power
voltage is different, the primary connections should be modified as indicated in the electric circuit
diagram.
Remove the right side lid to have access to make any changes in the voltage, this gives direct
access to the board of primary connections terminal.

IMPORTANT!

The earth terminal is connected to the chassi of the RECTIFIERS. It should be
connected to a efficient earth point of the main power installation. DO NOT connect
the earth conductor of the input cable to any of the bornes of the ON/OFF switch.
This puts the machine chassi under electric voltage hazard.
All the electric connections should be completely fitted so that there is no risk of sparks,
overheating or drops in the circuit voltage.
NOTE!
DO NOT USE THE MAIN POWER NEUTRAL FOR THE EARTH CONNECTION
Feeding Nominal load
voltage comsumpton
(V)
220
380
415
440
Feeding
conductors
(A) (copper - mm²)
165 35
96 35
87 35
83 35
- 27 -
The LHI´s
Delayed
fuses
(A)
160
80
80
80