HTP Pro Pulse 220 MTS, Owner'S Manual

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Over Load, Over Temp (Over-Heat), and Duty Cycle
Fig. 21
The Pro Pulse 220 MTS is designed for the maintenance welder. It has the ability to weld a lot of different materials
and a great variety of thicknesses. Thicker material, depending on type, temperature, etc. may require multi-pass
welds.
Duty cycle ratings can be confusing, but we want to make duty cycle less confusing. An 80% duty cycle means that,
out of a 10-minute time span (duty cycle is always a 10-minute time span, per definition, and this never changes), the
machine can weld for eight (8) minutes and then needs to idle with the cooling fan running for two (2) minutes. Do
not turn off or unplug the machine during this time.
However, these numbers change with the selected welding amperage and the ambient temperature. In reality, very few
can keep track of welding time like this so we equipped the Pro Pulse 220 MTS with a very sophisticated over-heat
protection. The machine monitors the temperature of several vital internal components. Just before temperatures
venture outside the safe operating range, the machine displays a message to the operator, the cooling fan continues to
run, and the welding output is shut down for four (4) minutes. This time allows the machine and internal components
to cool down to a safe operating temperature. There is no harm to the machine when the message is displayed, and it
does not matter how often this happens. There is no way to override this function.
The Pro Pulse 220 MTS is a machine in the 200 amp class; it is designed for welding operations up to 200 amps. The
Pro Pulse 220 MTS has the capability to run up to 220 amps for up to 10 seconds (this will take effect in some
aluminum hot start functions and in situations where the operator holds a too tight arc length (too close stick out).
Depending on the selected program and the welding material, the peak pulse can be as high as 300 amps ( Note: This
will not show in the display; the display shows an average amperage, comparable to a classic MIG machine ). If
its capabilities are exceeded, the machine automatically lowers the settings for protection purposes. This happens only
rarely in the pre-programmed synergic and pulse programs, but it can happen due to CTWD, unclean metal, or wire
that is out of specifications (e.g., too big in diameter for the program it is run in). In the case of the machine lowering
the settings automatically, you will be informed via the LCD. The welding parameters lower, the wire speed symbol
color changes from black to red, and the value (number in IPM) for the wire speed flashes in black and red (normally
the value is shown in solid black). There is no harm to the machine when this happens, and you can actually continue
welding at the lower settings. To avoid this, you should correct the problem and/or select slightly lower settings than
previously selected.