ESAB 0401264, Руководство пользователя и запасные части, Страница: 27 / 64

The installation must be performed by a professional trained and qualified.
WARNING!
This product is designed for industrial use. In domestic environment this product
may cause radio interference. It is the responsibility of the user to take suitable
precautions.
Note: connect the equipment to the power supply network with a system impedance 0.210 ohm
or lower. If the network impedance is higher, there is a risk of lighting devices present failures.
4.2 Receiving
When you receive a LHJ 750, remove all packaging which involves the equipment and check for
possible damage which could have happened by handling. Any complaints as to damage in
shipping must be directed to the carrier company.
Carefully remove any obstacle to the cooling air.
4.1 General
4 INSTALLATION
NOTE!
In case a LHJ 750 is not installed immediately, keep it in the original packaging or
stock it in a dry and ventilated place.
4.3 Working place
To have a safe and efficient operation many factors must be considered to determine where the
welding machine should be installed. Proper ventilation and cleanliness are necessary to cool
the equipment and for the operator's safety.
It is necessary to leave some room around the LHJ 750 with at least 700 mm width for ventilation,
operation as well as preventive or corrective maintenance.
Installation of any device to filter ambient air reduces the air volume available for machine
refrigeration and can cause internal components overheating. Installation of any filtering device
non authorised by the supplier cancels equipment warranty.
4.4 Power supply
The requisites for voltage supply are indicated in the nominal board. LHJ 750 is designed to
operate with three-phase 220, 380 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 LHJ 750 the operator can use the supplied input cable (4 conductors - 3
feeders and 1 grounding) or another one similar links with desired length. Be sure it has 4
conductors - 3 feeders and 1 grounding. In any situation power supply must be through a
properly dimensioned exclusive switch with protection fuses and circuit breakers.
Table below gives information for dimensioning cables and line fuses; eventually consult with
local rules.
LHJ 750 is supplied to operate from a 440V input .In case your input is different, primary
connections must be changed as indicated in the electrical scheme (see page 10). Removal of
left cover primary connections gives direct access to terminal bars of primary connections.
IMPORTANT!
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.
NOTE!
DO NOT USE THE NEUTRAL OF THE POWER SUPPLY SYSTEM FOR
GROUNDING.
4.5 Welding circuit
The good functioning of a LHJ 750 also depends on the use of an insulated copper welding
cable, which must be the shortest possible and compatible to the considered application(s), it
must also be in good shape and firmly connected to its terminals; Electrical connections in the to-
be-welded piece or in the work station and in the set "negative" terminal must be firm.
Whatever the length (the shortest possible) and whatever the used welding current, the welding
cable must correspond to the maximum current which the used RECTIFIER can supply at power
factor 60%.
Welding circuit electrical strength causes voltage drops which add to Rectifier natural internal
drop, reducing the arc voltage and the maximum available current making the arc unstable.
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TABLE 4.1
Feeding
Voltage (V)
Consume in
nominal load (A)
Feeding
Conductors
(copper - mm²)
Retard
Fuses (A)
220 160 35 160
380 93 35 100
440 80 35 80