Migatronic PI Manual De Instrucciones página 11

PI control panels
AC-t-balance (based on time) (TIG)
15
Adjustment of the refinement function during the
AC TIG welding of aluminium and its alloys. The
function is a balance based on time between the positive
and negative half period.
Adjustment is possible between 20 and 80 percent as the
statement in percent is based on the negative part of
the period time. Adjustment continues until a suitable
refinement zone is established around the molten pool. In
MMA the value is fixed to 50%.
By forcing the parameter to 100%, in TIG MODE the
machine executes a standard "Electrode Preheat" in
polarity DC+ then reverse the polarity to DC– like a
standard DC TIG. This function is used to clean the
workpiece when the arc is turned on.
AC-frequency
16
The AC frequency can be adjusted from 25 to
150 Hz for TIG welding. A low frequency during
TIG welding increases the tendency for the formation of a
large ball at the end of the tungsten electrode. Increasing
the frequency will reduce this tendency. The frequency for
MMA-welding can be adjusted from 25 to 100 Hz. Forcing
the Frequency to 0 Hz in MMA just reverse the polarity of
Electrode (+/ ), avoiding the need of exchanging Electrode
Clamp and Ground cable.
Depending from the selected value of current, the AC
frequency is regulated and limited according to the
following criteria: higher is the current, lower will be
the AC frequency – see diagram. When selecting an AC
frequency not compatible with the selected current, the
display will start flashing. The requested AC frequency
value will only be active in case the current is lowered.
During welding, the automatic reduction of AC-frequency
is indicated by continuous flashing of the green indicator
above the keypad. If the current is lowered according to
the diagram the indicator will switch off to indicate the
restored full compatibility between Hertz and Amperes.
150Hz
100Hz
50Hz
250A
Maximum AC frequency as function of welding current
Electrode preheating
17
The length of the preheat period depends on both
the diameter of the electrode and the angle of the
point of the electrode, as well as the size of the ball at
the end of the electrode.
Adjustment is possible from 1 to 20, with 1 being the
minimum and 20 being the maximum preheat periods. If
the period is too short the pilot arc will extinguish shortly
after ignition. The size of the ball at the end of the
electrode will increase if the pre-heat period is too long.
All manuals and user guides at all-guides.com
450A Amps
AC-I-balance, current intensity based,
18
(TIG AC)
The purpose of the function is also adjustment of
the refinement zone during AC TIG welding.
However, this balance
is based on the current
intensity of the positive
period proportional to
the current intensity of
the negative period. A
reduction of the positive
refinement current may
have the effect that the
lifetime of the tungsten
electrode improves. Adjustment is possible between 30
and 170%. In MMA the value is fixed to 100%.
Slow pulse (TIG DC and TIG AC)
19
Is used for selection of slow pulse.
The pulse current is equal to the set
current. It is possible to adjust:
Pulse time
Adjustable from 0.01 to 10 sec. in DC and from
0.1 to 10 sec. in AC, in steps of 0.01 sec.
Pause time
Adjustable from 0.01 to 10 sec. in DC and from
0.1 to 10 sec. in AC, in steps of 0.01 sec.
Base amp
Adjustable from 10 to 90% of the pulse current.
Fast pulse (only TIG DC)
20
Is used for selection of fast pulse.
The pulse current is equal to the set
current. It is possible to adjust:
Pulse frequency
For TIG DC welding the range is 25-988 Hz and
For MMA DC welding the range is 25-100 Hz.
Base amp
Adjustable from 10 to 90% of the pulse current.
Synergy PLUS
21
The machines automatically and dynamically adjust
all overall pulse parameters during welding, when
the peak welding current has been set by encoder.
TIG tack welding TIG-A-TACK
22
The machine offers one tack welding function
in the individual program to allow quick switch-
over from welding to tack welding. In TIG DC and AC the
following features will be available:
- Arc ignition HF 2-times
- No slope-up/slope-down
- No pulse
- Reuse of pre-gas/post-gas values from the current
program
- Spot TIME from 0.01 to 2.5 secs in steps of 0.01 sec. Set
the value by selecting the parameter "spot time"
11
100% 150% 50%
(only TIG DC)
TM
TM
.