5.Duty Cycle 100%

6.Pilot Modes

Auto-Restart, Pre-Flow Delay, Recycle

7. CNC Signals

Enable Start/Stop, OK-to-Move, Pilot Sensing Relay (PSR), Full CNC Available with Remote

8. Coolant Pressure

Internal Service-adjustable

130 psi (8.8 BAR) at zero flow

120 - 125 psi (8.2 - 8.5 BAR) at 0.6 gpm (2.6 lpm)

9. Coolant Flow Rate

0.5gpm (2.2 lpm) with 150 feet (45.7m) of total torch and torch leads at 70°F (21°C)

NOTE

The flow rate varies with lead length, torch con- figuration, ambient temperature, amperage level, etc.

10. Cooling Capacity

4,000 to 10,000 BTU

NOTE

Maximum value based on “free flow” condition.

11. Coolant Reservoir Capacity

2 gallons (8.8 liters)

Capable of handling a total of 150 feet (45.7m) of torch lead length

12.Power Supply Dimensions Enclosure Only -

Width: 24.12 in (0.61 m)

Height: 38.38 in (0.98 m)

Depth: 34.25 in (0.87 m)

Fully Assembled -

Width: 28.50 in (0.72 m)

Height: 43.38 in (1.10 m)

Depth: 43.75 in (1.11 m)

13. Weight of Power Supply Only

678 lbs (308 kg)

3.04 Theory Of Operation

A. Plasma Arc Cutting and Gouging

Plasma is a gas which is heated to an extremely high tem- perature and ionized so that it becomes electrically con- ductive. The plasma arc cutting process uses this plasma gas to transfer an electric arc to a workpiece. The metal to be cut is melted by the intense heat of the arc and then blown away by the flow of gas. Plasma arc gouging uses the same process to remove material to a controlled depth and width.

With a simple change of torch parts, the system can also be used for plasma arc gouging. Plasma arc gouging is used to remove material to a controlled depth and width.

B. Input and Output Power

The Power Supply accepts input voltages from 200 to 575V, 50 or 60 Hz, three-phase. Input voltages are set by an internal changeover in the unit. The unit converts AC input power to DC power for the main cutting arc. The negative output is connected to the torch electrode through the negative torch lead, and the positive output connects to the workpiece through the work cable.

C. Pilot Arc

When the torch is activated there is a selectable (2, 4, 7, or 10 second) gas pre-flow, followed by a uninterrupted DC pilot arc established between the electrode and tip. The pilot arc is initiated by a momentary high frequency pulse from the Arc Starter Box. The pilot creates a path for the main arc to transfer to the work. When the main arc is established, the pilot arc shuts off. The pilot can auto- matically restart (factory set for No Auto-Restart) when the main arc stops, as long as the torch remains activated.

NOTE

For the arc to restart automatically, AUTO RE- START must be enabled at switch settings inside the Power Supply.

D. Main Cutting Arc

The Power Supply accepts 50 or 60 Hz three-phase line input. An internal changeover switches input line volt- ages in three ranges, for 200/220/230V, 380/415/460V, or 500/575V operation. The power supply converts AC input power to DC power for the main cutting arc. The negative output is connected to the torch electrode through the negative torch lead. The positive output is connected to the workpiece via the work cable and clamp connection.

INTRODUCTION & DESCRIPTION

12

Manual 0-2533

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Thermal Comfort 3000 manual Theory Of Operation, Plasma Arc Cutting and Gouging, Input and Output Power, Pilot Arc
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3000 specifications

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