3-4
S
ETUP
Operator Manual
Figure 3-3 Proper Work Clamp
Connection
GROUNDING
To ensure personal safety, proper operation, and to reduce electromagnetic interference (EMI), the
Powermax350 must be properly grounded:
The power supply must be properly grounded through the power cord according to national or local
electrical codes. Single-phase service must be of the 3-wire type with a green or green/yellow wire for
protective earth ground and must comply with national or local electrical requirements. Do not use a
2-wire service! Refer to
Grounding
, in the Safety section.
WORK CABLE AND CLAMP
The work clamp must be attached to the workpiece while cutting. Ensure that the work clamp and the
workpiece make good metal-to-metal contact. Attach the work clamp as close as possible to the area
being cut to reduce exposure to electric and magnetic fields (EMF). Do not attach the work clamp to
the portion of the workpiece to be cut away.
PLASMA AIR SUPPLY
The air supply for the Powermax350 can be supplied as shop compressed air or cylinder compressed
air. A high-pressure regulator on either type of supply must be used and must be capable of delivering
air at 270 scfh/4.5 scfm (127 l/min) at a pressure of 70 psi (4.8 bar) to the filter on the power supply. If
air supply quality is poor, cut speeds decrease, cut quality deteriorates, cutting thickness capability
decreases, and parts life shortens.
WARNING
Do not allow the air inlet pressure to the filter on the power supply to exceed 120 psi
(8.3 bar). The filter bowl may explode if this pressure is exceeded.
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