Tr 50Mc Remote Control Pulsing Unit - Fronius MAGIC WAVE 2000 FUZZY Mode D'emploi

TR 50mc REMOTE CONTROL PULSING UNIT

Fig.14
Since a pre-set amperage is not always ideal for the entire duration
of a welding task, pulsating welding current is often used. For
example, when welding pipes in cramped conditions, a change in
amperage is often necessary. Should temperatures rise too high,
there is a danger that liquid metal will begin to drop from the welding
pool. Too low, and the workpiece material will not melt sufficiently.
Function: A relatively low welding current (background current I
rises via a steep up-slope to a considerably higher value (pulse
current I ) and drops again after a pre-set period (Duty-Cycle) to
1
the basic setting (background current I
itself over and over again. This is only possible when a specially
designed current source is used.
During the welding process, small sections of the weld zone melt
and solidify quickly. Welding a seam using this method is thus
considerably easier to control than if a large welding pool were to
from. This technique is also used when welding thin sheet metal.
Each fusion point overlaps the next, thus forming a neat and
regular seam. When the TIG pulsing technique is used when
welding by hand, the welding rod is applied at each current peak.
(Only possible in the lowest frequency range, i.e. 0,25 - 5 Hz).
Higher pulse frequencies are generally used in automatic welding
applications and serve mainly to stabilize the welding arc.
With the standard TR 50mc remote control pulsing unit two
operational modes are possible:
1. Regulation of impulse current I
TR 50mc remote control unit. (INT.)
2. Adjustment of impulse current I
remote control pedal unit.
PULSING CURRENT DIAL I
For continuous adjustment of the pulsing / main current in the
3 to 200 A range
PULSE FREQUENCY DIAL f (Hz)
For continuous adjustment of the pulse frequency, depending
on which frequency range has been preselected by switch
BACKGROUND CURRENT DIAL I
The setting for the background current is made as a percent-
age of the value set for the pulsing current I
), a process which repeats
2
by MANUAL operation of the
1
by means of the TR 52mc
1
(main current)
1
2
1
DUTY CYCLE DIAL (%)
(Setting dial for pulse / interval relationship)
This dial is for setting the relationship, in percentage terms,
between the pulsing current phase and the background current
phase.
Setting-example 1
Duty cycle dial is in scale position 10,
i.e. short pulsing current phase of 10 %, and long background
current phase of 90 % - means low degree of heat impact.
(Assuming that certain welding parameters are set).
Setting-example 2 (Fig. 15)
Duty cycle dial is in scale position 50,
i.e. pulsing current phase and background current phase are
equally long (each 50 %) - means medium degree of heat
impact.
(Assuming no change in the welding parameters that are set).
Setting-example 3
Duty cycle dial is in scale position 90,
i.e. long pulsing current phase of 90 %, and short background
current phase of 10 % - means high degree of heat impact.
(Assuming no change in the welding parameters that are set).
I
I
1
50%
)
2
Fig. 15
FREQUENCY RANGE SWITCH
Description of operating mode --> MANUAL regulation of
pulse current I
1
Connecting the remote control unit:
- Link the connecting socket
remote-control unit socket
cable.
- Plug in the plug-in connections the right way round, and screw
the coupling ring on as far as possible.
Functional description:
- Functional sequence possible in 2-step and 4-step operating
mode
blinks up on the power source
- LED indicator
- Set desired operating mode with function selector switch
- The appropriate LED-indicator
- Pre-select the frequency range (0.2 - 2Hz, 2 - 20Hz, 20 - 200Hz,
200 - 2000Hz) with the range switch
- The pulsing current I
"Max.") with setting dial
- The setting for the background current I
tage of the pulsing current I
- To select the duty cycle (= the relationship of pulsing current I
to background current I
.
stant), use dial
- Set the pulse frequency dial
- The mean welding-current amperage is indicated on display A
- The downslope parameter is set directly on the power source.
In the 4-step operating mode, the pulse phase begins as soon
as the operator releases the torch trigger in the up-slope. As can
be seen in Fig. 16, pulsing also takes place in the down-slope.
15
f
(Hz)
I
2
50%
Duty-Cycle
on the power source and the
electrically with the remote control
, , or lights up
.
is set continuously (between "Min." and
1
.
is made as a percen-
2
, with setting dial
1
in %, the frequency remaining con-
2
to the desired value.
t
1