Tweco 500P PowerMaster - Manual (Page 35)

POWERMASTER 500, 500P, 350
Manual No. 0-4749 4-3 OPERATION
6. Meter Display: The digital meter is used to preset the
output voltage or current when the power source is
not welding, and to display the actual amps or volts
while welding. To preset output current (amps) for
GTAW, SMAW or CAG, place meter Amps/Volts switch
in the Amps position and adjust the main Amps/Volts
control to the desired current. To preset output volts
for GMAW, place the meter Amps/Volts switch in the
Volts position and adjust the main Amps/Volts control
to the desired voltage. The meter will automatically
switch over to actual amps or volts while welding,
depending on the position of the meter Amps/Volts
switch.
7. Meter Amps/Volts Switch: This two-position toggle
switch is used to select whether the digital meter will
display amps or volts. To preset weld amperage for
GTAW, SMAW or CAG, place this switch in the AMPS
position. To preset weld voltage for GMAW, place this
switch in the VOLTS mode. After an arc has been
initiated, this switch allows either actual weld amps or
weld volts to be displayed on the meter.
8. Remote/Local Switch: The remote/local toggle switch
is used to select either front panel control of output
amps/volts (LOCAL mode), or remote control of output
amps/volts through the 19 pin or 14 pin receptacles
located on the rear panel (REMOTE mode). For GTAW
mode, the maximum output current must be preset
by the front panel Amps/Volts control pot. For all other
modes, the remote control is full output of the machine.
9. Amps/Volts Control: This control sets the output amps
or volts depending on the weld process. Clockwise is
increasing output. For all modes except GTAW, this
control is only active when the LOCAL/REMOTE switch
is in the LOCAL mode. For GTAW this control pot. is
used to set the maximum weld current available to a
foot pedal or hand control. To preset maximum output
for GTAW, place the LOCAL/REMOTE switch in the
LOCAL mode and set the maximum desired amperage
on the digital meter. (The meter amps/volts switch
should be in the amps position). Place the LOCAL/
REMOTE switch in the REMOTE mode to activate foot
pedal control.
10.Arc Force/Inductance Control: This control is
active for SMAW (Stick) and GMAW (MIG). In SMAW
mode, this controls the amount of arc force or "dig"
that the arc has. Maximum arc force is full clockwise,
full counter-clockwise is zero arc force. In GMAW
mode, this becomes an inductance control. Maximum
inductance is full clockwise. Higher inductance settings
make the arc “softer” with less spatter. Lower
inductance settings give a stronger “driving” arc. The
inductance should be set according to the type of wire
and gas and desired arc characteristics desired.
Generally, the inductance control can be set at mid-
range as a good starting point.
11.Output Negative Terminal: Connection point for
negative welding lead.
12.Output Positive Terminal: Connection point for
positive welding lead.