Lincoln Electric SVM140-A service manual PRO-CUT Troubleshooting Flowchart

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PRO-CUT TROUBLESHOOTING FLOWCHART

START

F-10

PRO-CUT 55

Turn on

Wait 5

seconds

Is green power	N
LED is only one lit
Y

Press PURGE button, set

pressure to 70psi, then release. If no air flow from torch, perform Gas Solenoid Test.

Pull gun trigger

and hold

Does preflow gas	N
flow from torch?
After 2 seconds of	N
preflow, does pilot
arc start?
Y
Is pilot arc smooth	N
and continuous?
Y
Will arc transfer	N
to work piece?
Y

Make sure machine	Are all LED’s	N
reconnect is properly
	flashing?
set for the input voltage
	Y
	Perform the Primary
	Power Board
	Resistance Test
	Perform the
	Auxiliary
	Transformer Test
	Perform the
	Input Rectifier
	Test

Make sure torch is			Output board
connected properly,
then perform the			may be faulty
Trigger Circuit Test
Check torch cable for			Perform the		Electrode Solenoid
			Torch Continuity
					in gun handle may
kinks or restriction
		and Solenoid Test
to air flow					be faulty
Disassemble torch	Perform the Torch			Consumables may
check for oil and/or
	Continuity and
water contamination				be worn. Replace.
	Solenoid Test.
		Make a short cut and pull
Make sure clamp			back into pilot mode.
is secured to work		Hold trigger until pilot arc
			goes out.

Are all LED’s	N	Are all LED’s	N		N			N
				Air low LED?			Safety LED?
lit?		off?
Y		Y		Y			Y
				Connect air supply,
The microprocessor		Perform the					Clean or replace
		Auxiliary		check air pressure
is faulty, replace							consumables
		Transformer Test		sensor
the control board
		Perform the				N
		Low Voltage					Is safety LED
		Circuit Test					flashing?
							Y
		Perform the
							Perform the
		Input Rectifier
		Test					Torch Continuity
							and Solenoid Test
						Check leads "N", "E", #364,
				Press
						& #369 between the torch
				Reset button
							receptacle and the
							output board

Choke may be shorted. Replace.

Replace the output board.

Does

arc go out within N 5 seconds?

System is functional. If

Y performance problems exist, see performance

recommendations

N

Thermal LED?

Y

Thermostats tripped. Leave machine on and allow to cool. Make sure fans are functioning.

If problems persist, turn machine off and blow out inside. Make sure air louvers are not blocked. If thermal LED never turns off, check thermostats and leads. Control board may be faulty. If machine operates normally while thermal LED is lit, the display board may be faulty.

Contact Lincoln

Electric Service

Department

TROUBLESHOOTING & REPAIR

F-10