Error codes
Err1 Power source secondary voltage is > + 90 V for overi 4 seconds.i
Uin Err Net overvoltage
Operation principle
Mastertig AC/DC-power sources are designed for demanding professional use, suitable for TIG-
/MMA welding, both AC and DC. Mastertig AC/DC-power sources are IGBT-inverter power
sources, based on PWM-principle. Operating frequency is 18/36 kHz.
Mastertig AC/DC comes in three sizes; 1~ 200 A, 3~ 250 A and 3~ 350 A.
Mastertig AC/DC-power sources offer 3 different types of function panels; basic panel, minilog-
panel and pulse panel.
Mastertig AC/DC´s function are controlled by a microcontroller (panel mounted), so all
functions are carried out programmatically.
The operating principle of Mastertig AC/DC-power sources is shown below:
U
G2
t
U
G3
t
U
1
t
C2
C3
V2
V3
T001
U
1
U
G2
U
G3
The primary inverter is a traditional half-bridge, where the intermediate circuit DC is halved by
working capacitors C2 and C3.
When the upper IGBT (V2) is conductive, the primary transformer T001 primary has positive
voltage and when the lower IGBT (V3) is conductive, it is negative. Welding power is altered by
altering the transistor timings (PWM).
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