Technical Characteristics - ESAB LHJ 750 Instruction Manual

2) DESCRIPTION
2.1) General
The LHJ 750 is a direct current rectifier, especially designed for the welding of stick electrode and
gouging.
Nominal current of 600 A at 60% of the duty cycle.
The welding current is adjusted continuously and precisely through a crank located on the front panel.
Has 220 V AC socket for the supply of the auxiliary equipment.
Voltmeter and Ampere meter are optional and can be mounted on to the specific kit.
Forced cooling system, which assures the internal components do not overheat.
The cabinet of LHJ 750 is robust and easily carried through working place. The trolley has break device
and has lifting holes.
3) DUTY CICLE
Duty cicle is the proportion between the time that a welding machine can provide the maximum welding
current (load time) and a reference time; according to international standards, reference time is 10 minutes.
The 60% Nominal duty cicle means that a machine can repeatedly provide its nominal welding current
during periods of 6 min. (load) and is followed by a 4-minute rest (the machine does not provide welding
current) (6 + 4= 10 min.).This process is repeatedly done so that the temperature of its internal components
do not exceed the project stated limits.The same goes for any power factor value.
In LHI Rectifier the allowed duty cicle increases up to 100% as the used welding current decreases;
conversely, the allowed duty cicle decreases as the welding current increases up to its maximum range.
Table 4.1 shows authorised loads for LHJ 750 Rectifier.

4)TECHNICAL CHARACTERISTICS

TABLE 4.1
Current range (A)
Nominal current (A)
Open circuit voltage (V)
Permited load
- Duty cycle (%)
- Current (A)
- Voltage (V)
Power Supply (V - Hz)
Apparent Nominal Power (KVA)
Thermal Class
Dimensions (w x d x h - mm)
Weight (kg)
LHJ 750
80 - 750
600
87
100 60 35
465 600 750
28,5 44 44
220 / 380 / 440 - 50/60
53
H (180° C)
780 x 950 x 870
225
15
LHJ 750