LOKERMANN GRAND ARC 320 CEL PFC MV, Руководство пользователя

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2.3
Brief
Introduction GRAND ARC 320 CEL PFC MV adopts the latest Pulse Width Modulation (PWM) technology and the
Insulated Gate Bipolar Transistor (IGBT) power modules. It uses switching frequencies in the 20KHz-50KHz
ranges so as to replace the traditional line-frequency transformer type welding machines. Thus,
machines are characterized with portability, small size, lightweight, low energy consumption and noise,
etc.
GRAND ARC 320 CEL PFC MV has excellent performance: constant current output makes welding arc
more stable; fast dynamic response speed reduces the impact from the arc length fluctuation to the
current; accurate stepless current adjustment and pre-setting function. There are also some automatic
protection functions for under voltage, over current, over heat, etc. inside the welder, when the
problems listed before occurred, the alarm light on the front panel is on and at the same time the
output current will be cut off. It can self-protect, prolong the usefull life, greatly improved the reliability
and practicality of the welding machine.
For GRAND ARC 320 CEL PFC MV, welding current, arc force and hot start can be adjusted by the
adjustment knob, which can satisfy with several kinds of welding technologies. They can also realize
high quality welding especially for using basic electrode, acid electrode and cellulose electrode.
When using cellulose electrode, they can also realize downward welding for butt joint in all position.
GRAND ARC 320 CEL PFC MV can also realize TIG operation. While MMA operation, if the electrode
touches workpiece over two seconds, the welding current will drop to the minimum current
automatically to protect the electrode, in TIG operation, the minimum current will be outputted firstly
until the arc is ignited by lifting method, then the output current will rise to the preset value.
GRAND ARC 320 CEL PFC MV is widely used in Petroleum, chemical, mechanical, shipbuilding,
architecture, boiler, pressure container, military industry and Maintenance work , etc. This machine has
high duty cycle even in the 40�, which can keep the continuous operation. The frame is Stability of the
machine, which can keep working under high temperature and corrosion environment.
MMA stands for Manual Metal Arc welding.
2.4
Duty cycle
and
Over-heat
The letter “X” stands for Duty Cycle, which is defined as the portion of the time a welding machine
can weld continuously with it’s rated output current within a certain time cycle (10 minutes).
The relation between the duty cycle “X” and the output welding current “I” is shown as the right figure.
If the welding machine is overheating, the IGBT over-heat protection sensing will send a signal to the
welding machine control unit to cut the output welding current OFF and light the over-heat pilot lamp
on the front panel. In that case, the machine should not be welding for 10-15 minutes to cool down
with the fanrunning. When operating the machine again, the welding output current or the duty cycle
should be reduced.
Relation of welding current and
duty cycle for GRAND ARC 320
CEL PFC MV (3ph-400V)