, which is referred to this line of MOSA welders, stands for "Digital
", and identifies the fact that the regulation of the
welding parameters is performed by means of a digital technique. More
precisely, in the DSP controller reside the programs which perform the
regulation of the different welding processes supported.
implementation of the control is accomplished by a power converter of the "Chopper"
type (Chopper System), which operates at high frequency (20 kHz).
frequency conversion allows to obtain superior welding performances in
comparison with more conventional techniques at low frequency.
Via a rotary
selector you can choose between 5 different welding programs.
- LIFT ARC TIG – This program performs a TIG welding with a "Lift Arc"
start. With this feature the arc is started simply by touching the piece,
- STICK (3 PROGRAMS) - They are specific for the electrode
welding (CC), being characterized by three different arc force levels with
increasing short circuit current from 1 to 3.
- MIG MAG – It is dedicated to WIRE welding, WITH GAS or
FLUX CORED. This welding process is performed at constant voltage (CV).
panel of the DSP control unit is provided with a military type circular
connector which can be connected to a MOSA remote control unit or wire feeder, for
MIG MAG. When plugging an external connector the control is automatically
switched from the front panel knob to the knob on the remote unit.
machines of this series are equipped with digital meters to monitor the welding
current and voltage.
software of the control unit, depending on the version of welder on which it is
installed, can handle various functions, including:
a) Power Optimizer - A function that
prevents overloading of the engine during welding
b) VRD - (Voltage Reduction Device) a
function that reduces the open circuit voltage to a safe value when not welding
c) Reverse polarity – In the models
where this function is present , a switch on the panel commands the contactor which
implements the polarity reversal.
controller also implements some security features:
- Chopper converter
- Overcurrent during welding (due to failure or malfunction)
sensor not connected
- Malfunction of the supply voltage