Tweco 170 HF Weldskill - Manual (Page 24)

WELDSKILL 170 HF INVERTER
4-2 April 23, 2008
4.03 Front Panel Functions
Refer to Figure 4-1 on the previous page.
A. Power ON Indicator
The Power ON Indicator illuminates when the ON/OFF
switch is in the ON position and the correct mains
voltage is present.
B. Over Heat Indicator
The welding power source is protected by a self
resetting thermostat. The indicator will illuminate if
the duty cycle of the power source has been exceeded.
If the Over Heat light illuminates wait for the Over
Heat light to extinguish before resuming welding.
C. Trigger Mode Selection Switch (TIG
Mode only)
Normal Mode.
Press the Tig Torch Trigger Switch and hold
depressed to weld. Release the Tig Torch
Trigger Switch to stop welding.
Downslope operates in TIG mode only. Whilst
welding if the Tig Torch Trigger Switch is
released, the welding current ramps down to
zero current over a defined period of time. The
time period is determined by the Downslope
Control Knob (F).
Latch Mode.
This mode of welding is mainly used for long
weld runs. The operator need only to press
the Tig Torch Trigger Switch to activate and
then release the Tig Torch Trigger Switch to
continue to weld, then press the Tig Torch
Trigger Switch again and release the Tig Torch
Trigger Switch to stop welding. This eliminates
the need for the operator to depress the Tig
Torch Trigger Switch for the complete length
of the weld.
Downslope operates in TIG Mode only. To
activate the Downslope function in Latch
mode whilst welding, the TIG Torch Trigger
Switch must be depressed and held which will
ramp the Welding Current down to zero over
a defined period of time. The time period is
determined by the Downslope Control Knob
(F). At any time whilst welding if the TIG Torch
Trigger Switch is depressed and released the
arc will extinguish immediately.
D. Process Selection Switch
Switches between Manual Arc, Lift TIG and HF TIG
modes. Refer to Section 3.06 Setup for Manual Arc
Welding and 3.07 Setup for TIG Welding.
E. Welding Current Control
The welding current is increased by turning the Weld
Current (A) control knob clockwise or decreased by
turning the Weld Current (A) control knob anti-
clockwise. The welding current should be set
according to the specific application. Refer to
application notes in this section for further
information.
F. Arc Force/Down Slope Control
Arc Force is effective when in Manual Arc Mode only.
Arc Force control provides an adjustable amount of
Arc Force (or "dig") control. This feature can be
particularly beneficial in providing the operator the
ability to compensate for variability in joint fit-up in
certain situations with particular electrodes. In general
increasing the Arc Force control toward '10'
(maximum Arc Force) allows greater penetration
control to be achieved.
Down Slope operates in TIG mode only. It is used to
set the time for weld current to ramp down. Refer to
Item C (Trigger Mode Selection Switch) for further
information regarding Downslope operation.
G. Gas Outlet
The Gas Outlet is a 5/8-18 UNF female gas fitting and
is utilised for the connection of a suitable Tig Torch.
H. Post Gas Flow
Post Gas Flow is the time Gas flows after the arc has
extinguished. This is used to cool and reduce
oxidisation of the Tungsten Electrode.
Post Gas Flow time is proportional to the Welding
Current. For example if the Welding Current is set to
10 amps the Post Gas Flow time will be approximately
3 seconds. For a Welding Current set to 170 Amps
the Post Gas Flow time will be approximately 10
seconds. The Post Gas Flow time cannot be adjusted
independently of the Welding Current.
I. Torch Trigger Socket
The 8 pin Torch Trigger Socket is used to connect the
Tig Torch Trigger Switch to the welding Power Source.
To make connections, align keyway, insert plug, and
rotate threaded collar fully clockwise.
NOTE:
Remote Welding Current Control is not
available on this model.
J. ON/OFF Switch (located on rear panel-
not shown)
This switch controls the Mains Supply Voltage to the
Power Source.