Helvi COMPACT 220AC/DC Manual De Instrucciones página 32

12. Indicates the absence of voltage between
the output (+) and (-) clamps of the live
generator (green LED, pos. 10, on). The
red LED will light up:
• when the electrode welding (MMA) with
active VRD function (ON) is completed;
• when the TIG arc-off welding is com-
pleted and the torch button is released
(OFF);
• due to the intervention of internal protec-
tions of the generator or for other defects.
13. Anomalies on the power voltage (green
LED on).
14. Selection button (red LED on) for TIG or
MMA welding procedure.
15. Selection button for 2T or 4T torch (red
LED on); press the button again and the
red LED will start flashing and will switch
to 2T or 4T pulsed mode (depending on
the selection made before).
16. Menu button for the regulation of welding
parameters (red LED on). Press the but-
ton several times to visualize on the di-
splay the welding parameters related to
the selected process, and which can be
adjusted using the knob (pos. 2). In MMA
welding, keep the button pressed for 5 se-
conds to select or disable (red LED on or
off) the VRD function (if activated, after 2
seconds from the electric arc stopped, no
load voltage goes down to 12Vdc). In TIG
AC welding, keep the button pressed for
5 seconds to select or disable (red LED
on or off) the high frequency (HF) fun-
ction for all the welding process or only
at the arc strike. In TIG DC welding, the
high frequency is working only at the arc
strike. Note: the arc can be struck also in
TIG Lift, follow these steps: hold the torch
trigger and turn the unit on through the
ON/OFF switch. Note: if unit is turned off,
once it will be turned on again, TIG Lift
function won't be activated if torch trigger
is not hold again.
17. Selection button (red LED on) for direct
current (DC) or alternating current (AC).
18. Selection button (red LED on) for alterna-
ting current frequency (Hz) or balancing
wave (wave balance) of the alternating
current (Warning: This button is operatio-
nal only if you select the AC function (al-
ternating current) with the button (pos.17).
Both values are set by the knob (Pos. 2):
• The frequency varies from 20 to 250 Hz;
more the value increases, the more the
32
welding arc is stable and concentrated.
• varies the percentage of positive cur-
rent. Value 0 means 50% DC+ and 502%
DC-. By increasing the value, the oxide
cleaning effect is increased, but the elec-
trode will wear faster.
• Save and Recall button for the adju-
sted welding parameters. See paragraph
PROG SAVE AND RECALL.
Pregas function (red LED on); time
adjustable from 0 to 2s with knob (item
2) / automatic mode (red LED flashing
and the word "Aut" on the display) al-
lows with the knob Pos.2 at minimum
to pass after the Pregas time directly
to the gradual increase of welding cur-
rent (up-slope); with knob (Pos. 2) in
other positions it sets the value of the
initial current variable from minimum
to set welding current (Iw). The dura-
tion of the initial current welding (li) is
determined by the operator in torch
trigger function mode (4T). Note: fun-
ction not available in 2T mode.
Time of gradual current increase (up-
slope), adjustable with knob (pos. 2)
from 0 to 25 s.
Hs/Af Hot start function (red LED on + letter
H on the display)/Arc force function
(red LED flashing + letter A on the di-
splay);
Hot start function (over current when
the MMA arc is triggered); this value
can be adjusted using the knob (pos.
2) from 0 to 75 (Hs max).
Arc force function (over voltage for arc
stability in MMA); this value can be
adjusted using the knob (pos. 2) from
0 to 99 (Af max).
Bl The function Bi-level allows choosing
2 levels of welding current, the current
(Iw) and a second level called "base
current" adjustable from the minimum
to the value of the set welding current
(Iw). The selection and adjustment of
the Bi-level function is carried out with
the knob (item 2). When the knob is
at the maximum setting, the Bi-level
function is not active and the display
(item 3) shows "OFF" while, by turning
the knob in other positions, you select
the second current level. During the
adjustment, values of the base current
are displayed on the display (pos. 3).
In welding to activate the Bi-level fun-