Lincoln Electric IM318-B manual Troubleshooting Guide, Electric Shock can kill

Page 14

TROUBLESHOOTING GUIDE

WARNING

ELECTRIC SHOCK can kill.

Have a qualified individual install and service this equipment.

Turn the input supply power OFF at the disconnect switch or fuse box before working on this equip- ment.

Do not touch electrically hot parts.

------------------------------------------------------------------------

Note: To locate the “Firing Circuit” and “Control/Fault Protection Circuit” P.C. boards, remove the upper case panel on the left side of the machine. The names are printed on the boards.

Observe all Safety Guidelines detailed throughout this manual

 

 

 

PROBLEMS

POSSIBLE CAUSE

REMEDY

 

 

 

 

(SYMPTOMS)

 

 

 

 

 

 

 

 

 

 

Input contactor (CR1) chatters.

a. Faulty input contactor (1CR).

a. Repair or replace.

 

 

 

 

 

b. Low line voltage.

b. Check with power company.

 

 

 

 

 

c. Faulty pilot relay (2CR).

c. Replace relay.

 

 

 

 

 

 

Machine input contactor does not operate.

a. Supply line fuse blown.

a. Replace if blown. Look for reason first.

 

 

 

 

 

b. Contactor power circuit dead.

b. Check pilot transformer T1 and associated leads

 

 

 

 

 

 

and 5 amp fuse.

 

 

 

 

 

c. Broken power lead.

c. Check input voltage at contactor.

 

 

 

 

 

d. Wrong input voltage.

d. Check voltage against nameplate.

 

 

 

 

 

e. Primary or power SCR thermostats open.

e. Check for overheating. Make sure both fans are

 

 

 

 

 

 

operating and there is no obstruction to free air flow.

 

 

 

 

 

 

Faulty thermostats — replace.

 

 

 

 

 

f. Open input contactor coil.

f. Replace coil.

 

 

 

 

 

g. Faulty on-off switch.

g. Replace switch.

 

 

 

 

 

h. Faulty pilot relay (2CR).

h. Replace relay.

 

 

 

 

 

 

 

 

Machine input contactor operates but no output

a. Electrode or work lead loose or broken.

a. Repair connection.

 

when trying to weld.

b. Open main transformer (T5) primary or sec-

b. Repair.

 

 

 

 

 

ondary circuit.

 

 

 

 

 

 

c. “Firing Circuit” P.C. board not connected or is

c. All nine light emitting diodes (L1 thru L9) must be

 

 

 

 

 

faulty.

lit. (See “P.C. Board Troubleshooting Guide”.)

 

 

 

 

 

d. Output pilot relay (6CR) not operating or faulty.

d. Check relay by connecting a jumper across termi-

 

 

 

 

 

 

nals 2 and 4 on DC-1500 terminal strip. Replace if

 

 

 

 

 

 

faulty.

 

 

 

 

 

 

 

 

Machine has maximum output but no control.

a. “Output Control” switch (SW4) in wrong position.

a. Check position of switch.

 

 

 

 

 

b. “Output Control” switch faulty.

b. Check switch and replace if faulty.

 

 

 

 

 

c. Open in feed back circuitry.

c. Check wiring and control and “Firing Circuit” P.C.

 

 

 

 

 

d. Faulty “Control/Fault Protection” or “Firing Circuit”

board wiring harness plugs.

 

 

 

 

 

P.C. boards.

d. All light emitting diodes must be lit, except L4 on

 

 

 

 

 

 

“Control/Fault Protection” board. (See “P.C. Board

 

 

 

 

 

 

Troubleshooting Guide.”)

 

 

 

 

 

e. Output control potentiometer open (lead no. 75).

e. Check and replace if faulty.

 

 

 

 

 

 

 

 

Machine does not have maximum output.

a. One input fuse blown.

a. Check and replace if blown after checking for rea-

 

 

 

 

 

 

son for blown fuse.

 

 

 

 

 

b. One phase of main transformer open.

b. Check for open and repair.

 

 

 

 

 

c. Faulty “Control/Fault Protection” or “Firing Circuit”

c. All light emitting diodes must be lit on both P.C.

 

 

 

 

 

P.C. boards.

boards, except L4 on “Control/Fault Protection”

 

 

 

 

 

 

board. (See “P.C. Board Troubleshooting Guide.”)

 

 

 

 

 

d. Output control potentiometer defective.

d. Check and replace if faulty.

 

 

 

 

 

e. Output control potentiometer leads open 226,

e. Check and repair broken leads.

 

 

 

 

 

237, 236, 73, 74, 76, 77.

 

 

 

 

 

 

 

Machine has output but trips off immediately.

a. Machine has either an internal or external short

a. Check internally and externally for any shorts and

 

 

 

 

 

circuit on the output.

remove or repair.

 

 

 

 

 

b. Faulty “Control/Fault Protection” P.C. board.

b. If no short circuits, LED L4 must be lit (See “P.C.

 

 

 

 

 

 

Board Troubleshooting Guide”).

 

 

 

 

 

c. Machine output voltage applied to control leads.

c. Check control cable or wire feeder for shorted or

 

 

 

 

 

 

grounded control leads.

 

 

 

 

 

 

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.

-12-

Image 14
Contents Idealarc DC-1500June Safety California Proposition 65 WarningsElectric Shock can kill Welding and Cutting Sparks can Cause fire or explosion Précautions DE Sûreté Thank You Installation FallingOperating Instructions ARC RaysTo Set for Machine or Remote Control Approximate Voltage Voltage Control Setting Recommended SET-UP Procedures for NA-3/DC-1500, NA-5/DC-1500 NL Option Kit Maintenance Operation When Connected to the LT-3 or LT-34Troubleshooting Guide Electric Shock can killBoard Troubleshooting Guide ElectricFiring Circuit P.C. Board Diagrams Connection of DC-1500 to NA-5 Connection of DC-1500 to NA-3 All, LT-5 or LT-7 Dimension Print Precaucion Warnung