26
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. (e.g. repairing the edges of tools,
improvements to cutting dies).
The TR52mc pedal remote-control unit is designrd to be used for jobs such as these.
Fig. 26
TR 52mc remote control pedal unit.
Functional description
-
When the TR 52mc remote-control pedal unit is connected, the machine automati-
cally switches over to 2-step operation.
-
Set desired operating mode with function button (4)
-
The appropriate LED indicator (5), (6) or (8) lights up -
operating mode electrode (LED indicator 5) 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 (15)
then the remote control pedal may be depressed to its full extent without the main
welding current exceeding the pre-set value. This has the advantage that the selected
current range is covered by one complete depression of the foot pedal.
TR 52mc remote
control pedal unit
Fig. 27
Functional sequence with the TR 52mc remote control pedal unit (2-step)
Connecting the remote control unit
-
Link the connecting socket [G] on the
power source and the socket (30) 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.
Pedal pressed down -> welding "ON"
Current is regulated by pedal
Foot off the pedal -> welding "OFF"
I
H
I
H
Gas pre-flow time
Arc is ignited with
minimum current
End of welding
Gas post-flow time
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
t
O
I
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