Tr 50Mc Remote Control Pulsing Unit - Fronius MagicWave 2600 Instructions De Service

TR 50MC REMOTE CONTROL PULSING UNIT

Fig.12 TR 50 mc remote control pulsing unit
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.
A relatively low welding current (background current I
steep up-slope to a considerably higher value (pulse current I
and drops again after a pre-set period (Duty-Cycle) to the basic
setting (background current I
2
and over again.
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.
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 TR 50mc remote control pulsing unit two operational
modes are possible:
- Regulation of impulse current I
unit.
- Adjustment of impulse current I
remote control pedal unit.
PULSING CURRENT DIAL I
- For continuous adjustment of the pulsing / main current
PULSE FREQUENCY DIAL f (Hz)
- For continuous adjustment of the pulse frequency, depen-
ding on which frequency range has been preselected by
switch .
BACKGROUND CURRENT DIAL I
- The setting for the background current is made as a percen-
tage of the value set for the pulsing current I
) rises via a
2
), a process which repeats itself over
by TR 50mc remote control
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-examples
Duty cycle dial is in scale position 10,
- Short pulsing current phase of 10 %
- Long background current phase of 90 %
- Low degree of heat impact.
Duty cycle dial is in scale position 50, (see Fig.13)
- Pulsing current phase and background current phase are
equally long (each 50 %)
- Means medium degree of heat impact.
Duty cycle dial is in scale position 90,
- Long pulsing current phase of 90 %
- Short background current phase of 10 %
- High degree of heat impact.
I
I
1
50%
Fig.13 Example of a setting: Duty cycle on "50" position
)
1
FREQUENCY RANGE SWITCH
OPERATING MODE: Regulation of pulse current I
remote control
- Link the connecting socket
remote-control unit socket
control cable.
- Plug in the plug-in connections the right way round, and
screw the coupling ring on as far as possible.
- LED indicator blinks up on the power source
- Set desired operating mode with function button
- 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
- The setting for the background current I
percentage of the pulsing current I
- To select the duty cycle use dial
- Set the pulse frequency dial
- 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. 14, pulsing also takes place in the down-slope.
Important! If you wish to be able to switch from main current to
crater-fill current while in pulsed-arc mode (without interrupting
welding), use:
- 4-step mode and a FRONIUS TIG torch with double control-
switch function, or:
- special 4-step mode and a non-Fronius TIG torch
For more details on 4-step mode and Special 4-step mode, please
refer to the section headed "Description of controls".
13
f
(Hz)
I
2
50%
Duty-Cycle
on the power source and the
electrically with the remote
, , or lights up
.
is set continuously with setting dial
1
is made as a
2
, with setting dial
1
to the desired value.
t
using a
1