Plasmadyne SD-100

Duty cycle specifies the percentage of a 10-minute cycle that a plasma power supply can operate at its rated output before requiring a cooling period. A 60% duty cycle at 100A means the unit can cut continuously for 6 minutes, then requires 4 minutes of idle time for internal cooling. On a single shift (8 hours), 60% duty cycle provides 4.8 hours of actual cutting time. A 100% duty cycle unit cuts continuously without enforced cooling breaks, providing 8 hours of actual cutting time per shift. For high-volume production cutting operations running long programs, the duty cycle limitation of lower-rated systems directly limits production output. The Plasmadyne SD-100's 100% duty cycle rating eliminates this constraint.

Air plasma on stainless steel produces an oxidized edge with discoloration from the nitrogen and oxygen in compressed air reacting with chromium in the stainless. The chromium oxide layer on the cut edge reduces corrosion resistance locally and requires grinding, pickling, or passivation treatment for most stainless applications. Nitrogen plasma uses high-purity industrial nitrogen (99.5% minimum, 99.99% preferred) which produces a cleaner, brighter cut edge with minimal oxidation. For food equipment, pharmaceutical, and architectural stainless applications where cut edge appearance and corrosion resistance matter, nitrogen plasma significantly reduces post-cut finishing requirements. The Plasmadyne SD-100 supports nitrogen cutting with appropriate gas connections and regulator.

The Plasmadyne SD-100 provides standard industrial CNC plasma interface signals: arc start dry contact input, arc transfer signal output, and raw arc voltage feedback output. These signals are compatible with all industrial CNC plasma table controllers including Hypertherm Phoenix, Burny 10, ESAB Vision 50, Farley CAM, and custom machine builder controllers. The arc voltage output (typically 60-120V DC at cutting speed) connects to the table torch height control (THC) module for automatic Z-axis adjustment. A 14-pin or terminal block interface connector is used - verify the specific connector format with the machine tool builder when integrating into an automated cutting system.

Hypertherm Powermax 105 (105A) vs Plasmadyne SD-100 (100A): the Powermax 105 has the advantage of Hypertherm's worldwide consumable distribution network, Smart Sense technology, and more modern torch design. The Plasmadyne SD-100 is positioned specifically for production mechanized use with the 100% duty cycle rating as its primary differentiator. The Powermax 105 is rated at 50% duty cycle at 105A, which means production shops running long continuous programs may encounter thermal limiting. For around-the-clock production with consistently long cutting programs, the SD-100's duty cycle advantage is meaningful. For shops with shorter programs and normal cutting intervals, the Powermax 105's superior consumable ecosystem gives it the practical edge.

Air plasma operation: clean dry compressed air at 5.5-7.6 bar (80-110 psi), minimum 340 L/min (12 SCFM) flow at cutting output. A refrigerant dryer and coalescing oil filter are required upstream of the plasma system - contaminated air is the leading cause of consumable failure. Nitrogen plasma operation (stainless): industrial nitrogen supply at 5.5-6.9 bar (80-100 psi), 99.5% purity minimum, 99.99% preferred. A dedicated nitrogen pressure regulator sized for the flow requirement connects to the gas inlet. Gas switching between air and nitrogen typically requires a manual changeover at the plasma inlet fitting, unless the cutting system includes an automated gas selection valve.