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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

Page 47
Image 47
Lincoln Electric SVM140-A service manual PRO-CUT Troubleshooting Flowchart