Fronius MAGIC WAVE 2000 FUZZY, Руководство по эксплуатации

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17
ENGLISH
TR 52mc REMOTE CONTROL PEDAL UNIT
Due to the fact that workpieces are often awkwardly shaped, it is
often necessary to alter the amperage in the course of the welding
operation. Typical cases are jobs such as repairing the edges of
tools, repairs or slight alterations in mould manufacture, or im-
provements to cutting dies.
In this case, the edges must be kept intact when the arc is ignited.
However, when welding over thicker points, care must be taken to
ensure that no lacks of fusion occur. In addition to this, the amount
of heat created during the welding operation must be carefully
controlled, since if the seam is overheated, hardening may occur,
which may render any subsequent work considerably more difficult.
These examples all demonstrate that, in such cases, the use of a
remote control pedal unit is indispensable.
Connecting the remote control unit:
- Link the connecting socket on the power source and the
socket on the remote-control unit electrically with the remote
control cable.
- Plug in the plug-in connections the right way round, and screw
the coupling ring on as far as possible.
Gas pre-flow time
Arc is ignited with minimum current
End of welding
Gas post-flow time
I
O
I
H
I
H
t
Pedal pressed down = welding "ON"
Current is regulated by pedal
Start of cycle
Current-rise
can be regulated by pedal
Max. welding current,
limited by main-current dial
(internally)
Current-drop,
can be regulated by pedal
Reduced welding current
Current-rise,
regulated by pedal
Desired welding current
Current-drop,
regulated by pedal
Foot off the pedal = welding "OFF"
Fig. 19 Functional sequence in standard welding operation with the TR 52mc
remote control pedal unit (2-step)
Fig. 18
Connecting the remote control unit:
- Link the connecting socket on the power source and the
socket on the remote-control unit electrically with the remote
control cable.
- Plug in the plug-in connections the right way round, and screw
the coupling ring on as far as possible.
Functional description:
When the TR 52mc remote-control pedal unit is connected, the
machine automatically switches over to 2-step operation.
- Set desired operating mode with function selector switch
- The appropriate LED indicator , or lights up - operating
mode electrode (LED indicator ) is possible
- The mean welding-current amperage is indicated on display A.
- No "Hold" function
- Gas pre-flow time and gas post-flow time are set directly at the
power source.
- To initiate the ignition process, gently step on the pedal.
- The level of the start arc current, the main current I
H
and the final
crater current can also be controlled from the pedal.
When the welder takes his foot right off the pedal, the welding
current is switched off, thus interrupting the welding operation.
- Gas post-flow time elapses.
Limitation of main current
If the maximum welding current value is set internally on the main
current I
H
dial then the remote control pedal may be depressed
to its full extent without the main welding current exceeding the
pre-set value. This has two advantages. The first of these is the
fact that the selected current range is covered by one complete
depression of the foot pedal. Secondly, the danger that a thin
tungsten electrode could be overloaded and thus burn through,
due to the operator accidentally depressing the pedal to its full
extent, is eliminated.
TR 51mc REMOTE CONTROL SPOT-
WELDING UNIT
Standard welding of thin sheet metal constructions in such a way
that they do not rust is often not possible due to severe warping of
the material. This is where spot welding comes into its own.
Similarly, problem welds, such as joins which are only accessible
from a single side, can easily be dealt with using the TIG spot-
welding process.
Important! Aluminium materials are difficult or impossible to TIG
spot-weld, as the oxide film between the metal sheets in the fusion
zone is not removed.
Fig. 20