Fronius TransPocket 2500 Instructions De Service page 60

Hot-Start Func-
tion (used with
rutile and Cel
processes)
Fig.4
Mode of functioning:
The welding current is raised to a specific value for 1.5 seconds. This value is around a
third higher than the set welding current
Example: 90 A was set at the adjuster. The Hot-Start current is 90 A + (90 A /3) = 120 A
Important! At a set welding current of 214 A or higher, the Hot-Start current is limited to
250 A.
Soft-Start func-
The Soft-Start function is intended for basic electrodes. Ignition takes place at a low
tion (used with welding current. Once the arc is stable, the welding current continues to rise until it
Basic function)
reaches the welding current command value.
Fig.5
Anti-Stick func-
As the arc becomes shorter, the welding voltage may drop so far that the rod electrode
tion will tend to „stick".
Electrode burn-out is prevented by using the anti-stick function. If the rod electrode
begins to stick, the power source switches the welding current off after 1 second. After
the rod electrode has been lifted off the workpiece, the welding operation can be continu-
ed without difficulty.
I (A)
120A
90A
1.5 s
Example of „Hot-Start" function
I (A)
Example of „Soft-Start" function
Advantages:
- Improved ignition, even when using
electrodes with poor ignition proper-
ties
- Better fusion of the base metal in the
start-up phase, meaning fewer cold-
shut defects
- Largely prevents slag inclusions
t
Advantages:
- Improved ignition properties on
electrodes that ignite at low welding
currents
- Largely prevents slag inclusions
- Reduces welding spatter
t
8