Tweco 500P PowerMaster - Manual (Page 40)

POWERMASTER 500, 500P, 350
OPERATION 4-8 Manual No. 0-4749
6. CAN Port (PowerMaster 500P): This serial port is used
for connection to a CAN compatible Thermal Arc wire
feeder or other auxilliary device. All of the
programmable features of the power source can be
accessed via this port.
4.05 GTAW (Gas Tungsten Arc Welding)
1. Connect the work lead to the positive terminal and the
torch to the negative terminal of the power source
(normal connection for DCEN).
2. Provide suitable shielding gas connections and controls
to the torch. The power source does not provide
connections for the shielding gas.
3. Select the proper tungsten size and type for the job.
4. If a foot pedal or torch control is being used, connect
to the 14 or 19-pin remote receptacle on the rear of
the power source.
5. Turn the control power switch ON, located on the front
panel of the power source. The digital display on the
power source should be activated.
6. Set the front panel mode switch to GTAW.
7. Preset the weld amperage using the front panel AMPS/
VOLTS control, by placing the meter amps/volts switch
in the amps position, and the LOCAL/REMOTE switch
in the LOCAL position.
8. If a foot pedal or torch amperage control is being used,
place the local/remote switch in the remote position
(after presetting the maximum desired amperage). The
digital meter will now display the foot/torch control
amperage. Until the foot pedal is pressed, the meter
will display the minimum amperage.
9. If a remote control is not being used, it will be necessary
to turn the output contactor ON/OFF switch to the ON
position to energize the output of the machine. Open
circuit voltage will now be present on the output
terminals of the power source.
10. Gently rest the torch cup on the workpiece.
11. Press the foot pedal or torch switch to energize the
output, if being used.
12. Rock the torch until the tungsten briefly touches the
workpiece. This will initiate the “LIFT-ARC” feature. Lift
or rock the tungsten back off of the work to initiate the
arc. During the time the tungsten is touching the work,
the power source will automatically limit the weld
current to around 20 amps. Once the arc is initiated,
the weld amperage will change to the preset value (or
foot pedal value). To minimize heating of the end of
the tungsten, it should be left in contact with the
workpiece only briefly.
13. To end the weld, release the foot pedal or turn off torch
switch if being used. Turn off shielding gas supply.
4.06 SMAW (Shielded Metal Arc
Welding)
1. Connect the welding leads to the output terminals of
the power source. Normally the work lead should
connect to the negative lead and the electrode holder
to the positive terminal (DCEP or reverse polarity).
2. If a remote control is being used, connect to the 14 or
19-pin remote receptacle on the rear of the power
source.
3. Turn the control power switch ON, located on the front
panel of the power source. The digital display on the
power source should be activated.
4. Set the front panel mode switch to SMAW.
5. Preset the weld amperage using the front panel amps/
volts control, by placing the meter amps/volts switch
in the amps position, and the local/remote switch in
the local position.
6. If a remote control is being used, place the local/remote
switch in the remote position. The remote control will
have full control of the output of the power source
from minimum to maximum.
7. Set the arc force control to the desired setting. Fully
counter-clockwise is off, full clockwise is maximum.
Higher arc force settings will give the arc more “dig”
or “drive” by increasing the short circuit current
available.