Lincoln Electric SVM140-A service manual Cutting Capability, Consumable Life, Limitations

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B-4 B-4

OPERATION

CUTTING CAPABILITY

The Pro-Cut 55 is rated at 55 amps, at 50% duty cycle on a 10 minute basis or 40 amps, at 100% duty cycle. If the duty cycle is exceeded, a thermal protector will shut off the output of the machine until it cools to the normal operating temperature.

Figure B.1 shows the cut capacity of the Pro-Cut 55 when cutting mild steel. The graph plots cut thickness vs. torch travel speed with a torch standoff of 0.15 in. (3.8mm).

Example: 0.25 material
Amps	Speed (IPM)
35	38
45	57
55	62

	FIGURE B.1 – LINCOLN’S PRO-CUT 55 MILD STEEL CUT CAPACITY CHART
(IPM)￿	MaximumSpeed	100
		40
TravelTorchSpeed
		80
Recommended	80% of	60
		20
					25 A			35 A		45 A		55 A
		0
		0.000	0.125	0.250		0.375	0.500		0.625		0.750

Material Thickness

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CONSUMABLE LIFE

The expected life for the Pro-Cut 55's electrode under normal operating conditions is approximately 320 starts/cuts. An erosion of .060 in. (1.5mm) is typical for end of electrode life. However, the electrode may last longer. A green and erratic arc will indicate definite electrode failure, and the electrode should be replaced immediately.

It is recommended that consumables be replaced in complete sets. (Example: Electrode and Nozzle). This will maximize the performance of the Pro-Cut 55 sys- tem.

LIMITATIONS

Do not exceed output current and duty cycle rating of machine. Do not use the Pro-Cut 55 for pipe thawing.

PRO-CUT 55