Lincoln Electric NA-5S User Manual
Na-5 automatic welding systems, Service manual, Svm131-a
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NA-5
AUTOMATIC WELDING SYSTEMS
SERVICE MANUAL
Sales and Service through Subsidiaries and Distributors Worldwide
22801 St. Clair Ave. Cleveland, Ohio 44117-1199 U.S.A. Tel. (216) 481-8100
World's Leader in Welding and Cutting Products
Premier Manufacturer of Industrial Motors
SVM131-A
July, 1997
Safety Depends on You
Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However,
your overall safety can be
increased by proper installation
... and thoughtful operation on
your part. DO NOT INSTALL,
OPERATE OR REPAIR THIS
EQUIPMENT WITHOUT READ-
ING THIS MANUAL AND THE
SAFETY PRECAUTIONS CON-
TAINED THROUGHOUT. And,
most importantly, think before
you act and be careful.
For use with the following models:
NA-5N
NA-5NF
NA-5S
NA-5SF
RETURN TO MAIN INDEX
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Table of contents
Document Outline
- Master TOC
- Safety
- Section A Installation
- Section B Operations
- Section C Accessories
- Section D Maintenance
- Section E Theory of Operation
- Section F Troubleshooting & Repair
- Symptoms
- The wire feeds whenever the input power switch is in the “ON” position.
- The wire does not feed. Pressing any of the switches (buttons) will NOT feed the wire. The motor does NOT run.
- The wire will not feed and the circuit breaker (CB1) trips when the inch down, inch up or the start buttons...
- When the inch up button is press the wire feeds down. When the inch down button is pressed the wire feeds up.
- The wire will not feed when the inch down button is pressed. The wire does inch up OK and feeds down...
- The wire will not inch down but does inch up properly. The wire does not feed in either direction when the start...
- The wire will not inch down but does inch up properly. When the start button is pressed the wire feeds up...
- NA-5 units above code 8300 with “cold starting”. The wire feeds up instead of down when the start button is pressed.
- NA-5 units above code 8300 with “cold starting”. While pressing the inch down button the wire does not stop when it touches.
- The wire will NOT inch up but does inch down and weld properly.
- The wire feeds UP when either inch button is pressed.
- The wire feeds down when either inch button is pressed.
- The speed and voltage controls do not function. All of the mode lights function properly.
- All the mode lights function properly. None of the speed controls operate properly.
- All the mode lights function properly. None of the voltage controls operate properly.
- Only the strike mode functions, when the unit is at idle, regardless of the selector switch position.
- Only the strike mode functions while welding. The unit stays in the strike mode and does not progress through...
- The strike light is OFF and neither strike control functions. The other mode lights work. The unit will not...
- The strike light does not light. The strike controls (voltage and wire feed speed) do function normally.
- The strike light comes on but the strike controls (voltage and wire feed speed) do not function normally.
- The start light does not light. The start controls (voltage and wire feed speed) may or may not function normally.
- The start light is ON but the start controls (voltage and wire feed speed) do not function. The NA-5 is...
- When the start button is pressed and the unit is welding, the start mode is skipped.
- When welding the start timer does not time out. The unit stays in the start mode.
- The crater light does not light. The crater controls (voltage and wire feed speed) may or may not function.
- The crater light is ON but the crater controls (voltage and wire feed speed) do not function. The NA-5 is...
- At the end of the weld the crater light does NOT light.
- At the end of the weld the crater timer does not time out. The unit stays in the crater mode.
- No burnback/retract occurs at the end of the weld.
- The burnback timer does not time out properly.
- The weld light does not light. The weld controls (voltage and wire feed speed) may or may not function.
- The weld light is ON but the weld controls (voltage and wire feed speed) do not function. The NA-5 is...
- During the welding sequence the weld light does not go ON.
- While welding the weld mode is omitted in the welding sequence. The weld timer is set for a longer...
- The weld timer does not time out. the unit stays in the weld mode.
- The start button does not initiate the power source output or the wire feed. The mode selector switch is in...
- The start button initiates the power source output, but the wire does not feed.
- The start button initiates the wire feed, but does not activiate the power source output.
- The travel function will not operate regardless of the travel switch position.
- The travel will not function with the travel switch in the “Hand” travel position. The unit operates properly...
- The travel will not function with the travel switch in the “Auto” postion. The travel operates correctly with the...
- The travel runs continuously when the travel switch is in the “Auto” position.
- After pressing the stop button, the electrode “Hot” light goes OFF, but the electrode wire remains electrically...
- After pressing the stop button, the weld light remains on and the wire continues to feed.
- The set and actual speed meter readings match within a few IPM, but both are in error.
- The set speed and actual speed meter readings do not match within a few IPM. One or both readings may be erratic.
- The set speed is adjustable and steady. The actual speed is uncontrollable. The meter displays the actual speed correctly.
- The set speed is adjustable and steady. The actual speed reading is incorrect and or erratic.
- The set volts and actual volts readings match within a few tenths of a volt while welding. However both...
- The actual volts reading does NOT match the set volts reading within a few tenths of a volt. One reading...
- The NA-5 repeatedly shutsdown while welding.
- The circuit breaker trips when the inch up, inch down, or start buttons are pressed.
- The circuit breaker trips and or the fuse (F101) blows when the NA-5 is turned on. (input power applied).
- The circuit breaker trips after the wire has been feeding for a period of time. Welding is normal.
- The 1/8 amp fuse on the voltage board repeatedly fails.
- The arc voltage appears to rise too slowly. The wire stubs or blasts off at the start of the weld sequence.
- The voltage seems too high or flares excessively at the start of the weld sequence. Once the arc is established...
- The arc is unstable or oscillating.
- The flux or gas/water solenoid does not function (open).
- The flux or gas/water solenoid continuously remains open.
- The arc is unstable or oscillating.
- The welding arc is variable or “hunting”.
- Poor arc striking with sticking or “blast offs”. The weld bead is ropey and has porosity.
- Section G - Electrical Diagrams