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SPECIFICATIONS
Service Manual
INTRODUCTION
The Powermax900 plasma cutting system uses an inverter power supply to provide a smooth DC output voltage,
producing excellent cut and gouge quality on mild steel, stainless steel, aluminum and other metals. The
Powermax900 power supply provides constant-current output variable from 20 to 55 amps, for optimum
performance on all thicknesses of metal up to 5/8" (16 mm) thick. At 55 amps, the Powermax900 can also cut
metals up to 7/8" (22 mm) thick and will sever metals up to 1-1/8"
(29 mm) thick.
Air is the primary plasma gas, providing low operating cost combined with high-speed performance. Cylinder air or
shop air can be used as long as it is clean, dry and oil-free. When properly set and maintained, the pressure
regulator and gas filter on the power supply ensure that the correct pressure and flow rate is supplied to the
system at the proper quantity and quality. The Powermax900 can also cut with nitrogen when extended electrode
life is a priority.
This service manual provides information for qualified service technicians to troubleshoot and repair the power
supply and torch. Sections 4, 5 and 6 contain in-depth parts lists of the Powermax900 systems. This manual also
provides a detailed list of safety practices, so that the system can be safely tested and maintained. READ THE
SAFETY SECTION (Section 1) FIRST!
The Powermax900 operator manual provides setup and daily operating instructions.
Figure 2-1 Powermax900 Hand Plasma Cutting System*
* Single-phase 208/240/480V power supply shown.
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