Lincoln Electric NA-5S User Manual
Na-5 automatic welding systems, Service manual, Svm131-a
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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