Arcoweld Arcostick MMA 160 Minespec, Руководство оператора

Страница: 10 / 28

SUMMARY
7
2.2 Working Principle
The working principle of Arcoweld MMA welders is shown in the following figure. Single phase
110V
－
220V±10%
work frequency (50/60 Hz) AC is rectified into DC, then by PFC circuit,
DC(about 380V)is converted to medium frequency AC (about 20-40KHz) by inverter device (IGBT
module), after reducing voltage by medium transformer (the main transformer) and rectified by
medium frequency rectifier (fast recovery diodes), and is outputted by inductance filtering. The
circuit adopts current feedback control technology to insure current output stably. Meanwhile,
the welding current parameter can be adjusted continuously and steplessly to meet with the
requirements of welding craft.
2.3 Volt-Amperage Characteristic
Arcoweld MMA we
lders have excellent volt-amperage characteristics, as displayed in the following
graph. In MMA welding, the relation between the rated loading voltage U
2
and welding current I
2
is as follows:
When I
2
≤ 600A
，
U
2
＝
20
＋
0.04 I
2
（
V
） ；
When I
2
＞
600A
，
U
2
＝
44
（
V
） .