Tweco 500P PowerMaster - Manual (Page 24)

POWERMASTER 500, 500P, 350
INTRODUCTION 2-8 Manual No. 0-4749
2.10 Standard Features
1. Short-Circuit Protection – The output of the power
source can be short circuited in any of the modes of
operation. This protection feature will instantly limit
the output current to a safe value, to assure reliable
operation of the power source.
2. Output Overload Protection – The overload protection
feature will limit the continuous weld current to the
maximum value listed in the specifications for any of
the modes of operation. The machine will continue to
operate but the current will be limited to this maximum
value.
3. Cooling Fan Control – The cooling fans are designed
to operate only when required. They will come on
whenever the output contactor control of the machine
is on. The fans will come on for several minutes when
the machine is first turned on and will normally stay
on for several minutes after the output contactor
control has been switched off. The fans will turn off
after several minutes of inactivity, to minimize the
amount of dirt being drawn into the machine, as well
as lengthen the life of the fans.
4. Over-temperature Protection – If the machine
overheats because of blocked air flow, excessive
ambient temperatures, failed fan, or other causes, the
over-temperature protection will disable the output of
the power source until it has cooled down. If the over-
temperature protection circuit operates, it will turn on
the over-temperature indicator light on the front panel
and the fans should continue to run until the machine
cools. The overtemperature circuit will reset itself
automatically once the machine has cooled.
5. Multi-Voltage Operation – The power source is
designed to operate from a wide range of input line
voltages as given in the specifications. The machine
can be reconfigured for the different line voltages with
a simple, rugged voltage changeover panel (refer to
Section 3 Installation for detailed instructions).
6. Multi-Process Operation – The machine has built in
electronic controls which have been optimized for
most welding processes. The following controls are
standard: GTAW with Lift Start, SMAW, CAG, GMAW/
FCAW including the short-arc, globular and spray
transfer modes. Each mode of operation has a
dedicated electronic control which has been optimized
for that particular process.
2.11 PM500P Programmable Features
1. Lockout features: Any or all of the following controls
can be locked out on the Power-Master 500P so they
will have no affect on the operation of the machine.
The machine will remain in whatever mode or
condition it is in before the feature is locked out.
1.1 Mode Select Switch - Prevents changing of the
mode of operation.
1.2 Remote On Switch - Prevents changing of the
remote control feature.
1.3 Schedule Select Switches - Prevents changing of
the pulse mig schedule.
2. Restricted output adjustment: The range of
adjustment of the output of the power source can be
restricted for the various modes of operation.
2.1 Amps Adjust Range Locked: A high and low
amperage limit can be programmed which will
limit the output amperage adjust range. This
amperage adjust range is in effect for both GTAW
and SMAW modes.
2.2 Volts Adjust Range Locked: A high and low
voltage limit can be programmed for GMAW mode
which will limit the voltage adjust range of the
power source.
2.3 Pulse Reference Range Locked: A high and low
pulse reference limit can be programmed which
will limit the adjust range of the output of the
machine for the Pulsed-GMAW mode.
3. Pulse Parameters: All 24 of the Pulsed GMAW
schedules can be modified, to allow for a very flexible
design of the optimum pulse waveform. In addition
the arc starting conditions, and arc end conditions
can be modified.
4. Wire sharp: Both GMAW and Pulsed GMAW modes
provide a wire sharpening sequence at the end of the
weld to condition the end of the wire. The wire
sharpening time and voltage can be modified.
5. Meter Functions: The meter hold feature and meter
refresh rate can both be modified if desired.
6. Software Control: In addition to the programmable
features of the Power-Master 500P, the power source
can be controlled through either the programmer port
or the CAN port. This includes complete control of
the power source, such as mode, pulse schedule,
pulse parameters, remote/local control, etc. Most of
the features of the power source can be controlled in
real time under live arc conditions.