Lincoln Electric IM491-B manual Location, High Frequency Interference Protection

INSTALLATION

SAFETY PRECAUTIONS

●Read the safety precautions at the beginning of this Operator's Manual before proceeding.

●Only personnel that have read and under- stood this Operating Manual should install and operate this equipment.

●Machine must be connected to system ground per any national, local or other applicable electrical codes.

●The power switch is to be in the “OFF” position when connecting power cord to input power.

WARNING

TURN THE INPUT POWER OFF USING THE DIS- CONNECT SWITCH AT THE FUSE BOX BEFORE ATTEMPTING TO CONNECT THE INPUT POWER LINES.

•Only qualified personnel should perform this installa- tion.

•Turn the power switch on the PRO-CUT “off” before connecting or disconnecting output cables.

•Connect the PRO-CUT grounding terminal located on the side of the case back to a good electrical earth ground.

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LOCATION

Place the PRO-CUT where clean cooling air can freely circulate in through the front intake and out through the rear louvers. Dirt, dust or any foreign material that can be drawn into the machine should be kept at a minimum. Failure to observe these precau- tions can result in excessive operating temperatures and nuisance shutdown of the machine. Before plan- ning the installation, read the section entitled “High Frequency Interference Protection”.

A source of clean, dry compressed air or nitrogen must be supplied to the PRO-CUT. Oil in the air is a severe problem and must be avoided. The supply pressure must be between 80 and 150 psi (551 and 1032 kPa). The flow rate is approximately 8.0 cfm (225 l/min.). Failure to observe these precautions could result in excessive operating temperatures or damage to the torch.

HIGH FREQUENCY INTERFERENCE PROTECTION

The PRO-CUT employs a solid state high frequency torch starting circuit which drastically reduces high fre- quency emissions from the machine as compared with spark gap type high frequency generators.

Radiated interference can develop, however, in the following four ways:

(1)Direct interference radiated from the machine.

(2)Direct interference radiated from the cutting leads.

(3)Direct interference radiated from feedback into the power lines.

(4)Interference from reradiation of “pickup” by ungrounded metallic objects.

Keeping these contributing factors in mind, installing equipment per the following instructions should mini- mize problems.

(1)Keep the machine power supply lines as short as possible.

(2)Keep the work and torch leads as short as possi- ble and as close together as possible. Lengths should not exceed 50’ (15.2 m). Tape the leads together when practical.

(3)Be sure the torch and work cable rubber cover- ings are free of cuts and cracks that allow high frequency leakage.

(4)Keep the torch in good repair and all connections tight to reduce high frequency leakage.

(5)Keep all access panels and covers securely in place

NOTE: The machine frame MUST also be grounded - see paragraph under “Input Connection”. The work terminal ground does not ground the machine frame.

(6)When the machine is enclosed in a metal build- ing, several good earth driven electrical grounds around the periphery of the building are recommended.

Failure to observe these recommended installation procedures may cause radio or TV interference prob- lems and result in unsatisfactory cutting or gouging performance resulting from lost high frequency power.

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