Clarke 052249011064, Operating Manual

8

DESCRIPTION

Your new Plasma Cutter is designed as a

clean, distortion free means of cutting

through metal, up to 3/16 inch thick.The

plasma cutter power generator consists of a

transformer, a rectifying unit, and a PC

Board. The PC Board controls the unit safe-

guards and governs the work cycles of the

various components which make up the unit,

such as the solenoid valve, the power con-

tactor, etc. Table 1 lists your Plasma Cutter

specifications.

Table 1.

Plasma Cutter Specifications

Primary (input) volts 

120 Vac

Primary (input) Amps 

20

Phase Single

Frequency 60Hz

Secondary (output) volts 

88

Secondary (CSA output) amps 

18

Open Circuit Volts (Max.) 

340 Vdc

Duty Cycle Rating 

15%

PLASMA CUTTER OPERATING

CHARACTERISTICS

DUTY CYCLE

The duty cycle rating of a plasma cutter

defines how long the operator can cut and

how long the unit must be rested and cooled.

Duty cycle is expressed as a percentage of

10 minutes and represents the maximum

cutting time allowed. The balance of the 10-

minute cycle is required for cooling.

This plasma cutter has a duty cycle rating of

15% at the rated output. This means that you

can cut for 1.5 minutes out of 10 with the

remaining 8.5 minutes required for cooling. 

INTERNAL THERMAL PROTECTION
CAUTION

Do not constantly exceed the duty cycle or

damage to the unit can result.

If you exceed the duty cycle of the plasma

cutter, an internal thermal protector will open,

shutting off all functions except the cooling

fan. If this happens, DO NOT SHUT OFF

THE UNIT. Leave the unit turned on with the

fan running. After cooling, the thermal protec-

tor will automatically reset and the unit will

function normally again. However you should

wait at least ten minutes after the thermal

protector opens before resuming work. You

must do this even if the thermal protector

resets itself before the ten minutes is up or

you may experience less than specified duty

cycle performance.

PNEUMATIC PROTECTION

A pneumatic device prevents damage to the

torch due to switching on with either no air

supply or low air pressure. An amber light on

the front panel lights up when the pneumatic

device intervenes. (See Figure 1)

ELECTRIC SHOCK PROTECTION

An electric shock protection device prevents

the operator from coming into contact with

electrically live parts of the torch (such as the

electrode, etc.). This consists of a safety

device, built into the body of the torch, which

breaks the main power circuit when the end

part of the torch is removed to replace the

electrode or the nozzle.

Note: 

When the electrical protection device

is activated, the unit is prevented from 

operating.

PLASMA CUTTER SPECIFICATIONS