Alfa IN PEGAS 250 MIG SYN, Instruction Manual, Page: 18 / 23

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5. Machine output (current, wire feed speed, material thickness) is set by the
encoder A5 .
6. If necessary, power and its characteristics can by fine-tuned by encoder
A16 .
7. The value of the voltage or the choke correction are shown on the display
A11 only during the configuration.
8. From the factory, the machine is set to use voltage correction. (To change
the meaning of the correction from Voltage to Wire speed, press and hold
the button
A13 ). (When you change the welding power by turning the
encoder A5 it will reset the correction, in other words the machine uses
parameters from the factory stored synergic curves. The machine supports
the possibility of maintaining a user-defined correction when changing the
welding power. Switching to such arrangements must be made by the
manufacturer or an authorized service center.)
9. Button A13 to switches between correction of voltage and correction of the
choke. Confirm the change with encored A16 .
9. MIG/MAG WELDING MANUAL
1. Choose MAN method (see SETTING THE METHOD OF WELDING )
2. The left display A10 shows MAN.
3. The left display A10 shows the wire feed speed, the right display A11
shows voltage or choke.
4. Wire feed speed is set by the encoder A5 .
5. Voltage or choke is adjusted via the encoder A16 .
6. Voltage or choke can be displayed and set by long-pressing A13 .
7. During welding, the display A10 shows measured values of welding
current and the display A11 shows measured values of voltage.
8. After welding, on the displays will remain measured values ( HOLD ) for 6
sec. WELDING VOLTAGE
It is set using voltage potentiometer pic. 1, A16
WELDING CURRENT – GENERAL INFORMATION
Size of the welding current depends on the wire feed speed and voltage.
Characteristic of the curve ("hardness / softness") can be controlled by
correction of the choke.
Approximate setting for the MIG / MAG welding current and voltage corresponds
the empirical relationship U2 = 14 +0.05 I2. According to this relationship, we
can determine the required voltage. When setting the voltage, we expect the
decline in voltage during load. The voltage drop is approximately 4.5-5.0 V at
100 A.