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FOR ENGINE
powered equipment.

1.a. Turn the engine off before troubleshooting and maintenance

work unless the maintenance work requires it to be running.

____________________________________________________

1.b. Operate engines in open, well-ventilated

areas or vent the engine exhaust fumes 
outdoors.

____________________________________________________

1.c. Do not add the fuel near an open flame weld-

ing arc or when the engine is running. Stop
the engine and allow it to cool before refuel-
ing to prevent spilled fuel from vaporizing on
contact with hot engine parts and igniting. Do
not spill fuel when filling tank. If fuel is spilled,
wipe it up and do not start engine until fumes
have been eliminated.

____________________________________________________

1.d. Keep all equipment safety guards, covers and

devices in position and in good repair.Keep
hands, hair, clothing and tools away from V-
belts, gears, fans and all other moving parts
when starting, operating or repairing equip-
ment.

____________________________________________________

1.e. In some cases it may be necessary to remove safety

guards to perform required maintenance.

Remove

guards only when necessary and replace them when the
maintenance requiring their removal is complete.
Always use the greatest care when working near moving
parts.

___________________________________________________

1.f. Do not put your hands near the engine fan. Do not attempt to

override the governor or idler by pushing on the throttle con-
trol rods while the engine is running.

___________________________________________________

1.g. To prevent accidentally starting gasoline engines while

turning the engine or welding generator during maintenance
work, disconnect the spark plug wires, distributor cap or
magneto wire as appropriate.

i

SAFETY

i

ARC WELDING CAN BE HAZARDOUS. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH.
KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.

Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you pur-
chase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box 351040,
Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available from the
Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.

BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE
PERFORMED ONLY BY QUALIFIED INDIVIDUALS.

WARNING

Mar ‘95

ELECTRIC AND 
MAGNETIC FIELDS
may be dangerous

2.a. Electric current flowing through any conductor causes 

localized Electric and Magnetic Fields (EMF). Welding 
current creates EMF fields around welding cables and 
welding machines

2.b. EMF fields may interfere with some pacemakers, and

welders having a pacemaker should consult their physician
before welding.

2.c. Exposure to EMF fields in welding may have other health

effects which are now not known.

2.d. All welders should use the following procedures in order to

minimize exposure to EMF fields from the welding circuit:

2.d.1. Route the electrode and work cables together - Secure

them with tape when possible.

2.d.2. Never coil the electrode lead around your body.

2.d.3. Do not place your body between the electrode and

work cables. If the electrode cable is on your right 
side, the work cable should also be on your right side.

2.d.4. Connect the work cable to the workpiece as close as

possible to the area being welded.

2.d.5. Do not work next to welding power source.

1.h. To avoid scalding, do not remove the

radiator pressure cap when the engine is
hot.

CALIFORNIA PROPOSITION 65 WARNINGS

Diesel engine exhaust and some of its constituents
are known to the State of California to cause can-
cer, birth defects, and other reproductive harm.

The engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.

The Above For Diesel Engines

The Above For Gasoline Engines

Содержание LT-7

Страница 1: ...facturer of Industrial Motors IM279 TS JUNE 1995 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...

Страница 2: ...R WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING Read and understand the following safety highlights For additional safety information it is strongly recommended that you pur chase a copy o...

Страница 3: ...ical earth ground 3 f Maintain the electrode holder work clamp welding cable and welding machine in good safe operating condition Replace damaged insulation 3 g Never dip the electrode in water for co...

Страница 4: ...vent the welding sparks from starting a fire Remember that welding sparks and hot materials from welding can easily go through small cracks and openings to adjacent areas Avoid welding near hydraulic...

Страница 5: ...B 4 P C Board Status Lights B 21 Wire Drive Motor Test B 24 Travel Motor Test B 26 Wire Drive Motor Removal and Replacement B 30 Diagrams Section C M15342 Connection Schematic C 1 L7460 Control Box Wi...

Страница 6: ...lied to the the variable voltage board and through resistor R1 to the control board The 115VAC is rectified and regulated by the control board which supplies 24VDC to the logic board GLP WELD CURRENT...

Страница 7: ...rectly to the control board dictates that the wire drive motor reverse direction and back the electrode wire away from the work piece Travel speed direction and mode either manual or auto are determin...

Страница 8: ...kes contact with the work piece this low voltage is loaded down thus signaling the control circuitry to stop the wire feed motor This feature allows the operator to utilize work touch sensing FIGURE E...

Страница 9: ...NOTES A 4 A 4 LT 7 TRACTOR...

Страница 10: ...the machinery may exhibit Find the listing that best describes the symptom that the machine is exhibiting Symptoms are grouped according to function problems and travel problems Step 2 PERFORM EXTERN...

Страница 11: ...ce it directly into the equip ment Don t set the PC board on or near paper plastic or cloth which could have a static charge If the PC board can t be installed immediately put it back in the static sh...

Страница 12: ...closed 3 Check the Inch Up Switch S3 Make certain it is not stuck closed 1 If light 1B on the control board is NOT on then the control board may be faulty Replace 2 If lights 1B and 1A are both ON th...

Страница 13: ...n and functioning prop erly 2 Check the circuit breaker locat ed on the front cover If tripped reset If circuit breaker repeat edly trips consult appropriate PROBLEMS SYMPTOMS 3 Open the front cover a...

Страница 14: ...SYMPTOMS FIELD COURSE OF ACTION RECOMMENDED SHOP COURSE OF ACTION The wire will not feed and the cir cuit breaker trips when the inch or start switches are pressed 1 Reset the circuit breaker and obse...

Страница 15: ...MPTOMS FIELD COURSE OF ACTION RECOMMENDED SHOP COURSE OF ACTION The wire will not feed when the start switch is pressed There is not a voltage indicated on the LT7 voltmeter The wire does inch up and...

Страница 16: ...ing the inch down switch observe light 2J It should be lit If not the inch down switch S4 or associated wires may be faulty See wiring diagram 2 If the LT7 is in the constant volt age CV mode and ligh...

Страница 17: ...2531 or 1 800 833 9353 CAUTION FUNCTIONAL PROBLEMS PROBLEMS SYMPTOMS FIELD COURSE OF ACTION RECOMMENDED SHOP COURSE OF ACTION The wire will NOT inch down but inches up properly When the start switch...

Страница 18: ...CTION The wire will not inch down The wire inches up properly When the start switch is pressed the wire feeds up instead of down 1 Check the connections between the power source and LT7 for loose or i...

Страница 19: ...re does not stop feeding when it touches the work piece The wire will not inch up The wire inches down properly 1 Make certain a variable voltage board is installed and connect ed correctly 2 The jump...

Страница 20: ...ECOMMENDED SHOP COURSE OF ACTION The wire feeds up with either inch switch The wire feeds down with either inch switch 1 While pressing the inch down switch observe light 2E on the logic board If ligh...

Страница 21: ...s at full speed during the inch mode only The wire feeds at full speed during the weld mode only 1 The logic board may be faulty 1 Remove electrode from drive rolls and place a jumper wire from lead 5...

Страница 22: ...BLEMS PROBLEMS SYMPTOMS FIELD COURSE OF ACTION RECOMMENDED SHOP COURSE OF ACTION The wire feeds at full speed in both inch and weld modes The wire has limited or erratic speed control in one or more m...

Страница 23: ...sources put a jumper from 2 to 4 on the ter minal strip This activates the output from the power source Test for voltage at the output terminals of the power source If no voltage is indicated then th...

Страница 24: ...OURSE OF ACTION No control of power source output from LT7 tractor Power source does have output The circuit breaker trips while the LT7 is at idle not feeding wire 1 Check control cable leads for pro...

Страница 25: ...urce output contactor does NOT drop out The power source output terminals are always electrically hot The welding and travel do not stop when the stop switch is pressed 1 With the LT7 at idle not feed...

Страница 26: ...age is NOT present check the circuit breaker the R5 resistor the travel switch and the associ ated wiring See wiring dia gram 3 If the correct AC voltage IS pre sent at leads 531 to 632 then check the...

Страница 27: ...vel switch set to manual The travel motor runs continuously with travel control switch set on automatic 1 Check light 2H on logic board Light 2H should be lit when automaic travel is required If light...

Страница 28: ...ed ly trips The travel motor runs at full speed with no control 1 While unit is traveling check the the travel motor armature cur rent Normal current is 0 5 amps DC Note In older units also check for...

Страница 29: ...incoln Electric Service Department for electrical technical troubleshooting assistance before you proceed Call 216 383 2531 or 1 800 833 9353 CAUTION TRAVEL PROBLEMS PROBLEMS SYMPTOMS FIELD COURSE OF...

Страница 30: ...H DOWN SWITCH PRESSED 2K SIGNAL TO OPERATE POWER SOURCE CONTACTOR 2L WELD VOLTAGE CONTROL OPERATIVE 2M GROUND LEAD PROTECTOR TRIPPED 3A ELECTRODE VOLTAGE OUTPUT FROM VV BOARD 3B ELECTRODE VOLTAGE INPU...

Страница 31: ...T 7 TRACTOR FIGURE B 1 Logic P C Board LED Locations FIGURE B 2 Voltage P C Board LED Locations FIGURE B 3 Control P C Board LED Locations L5927 LOGIC 2B 2C 2D 2E 2F 2H 2J 2K 2L 2M L5394 VARIABLE VOLT...

Страница 32: ...NOTES B 23 B 23 LT 7 TRACTOR...

Страница 33: ...bserve all safety notes and precautions detailed throughout this manual If for any reason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln...

Страница 34: ...r connector See Table B 3 3 Apply field voltage first pins C and D to the motor Then slowly apply the arma ture voltage on pins A and B See Table B 3 4 The motor should run and the speed should vary w...

Страница 35: ...precautions detailed throughout this manual If for any reason you do not understand the test procedures or are unable to perform the test repairs safely contact the Lincoln Electric service departmen...

Страница 36: ...ce test is good pro ceed to the Motor Applied Voltage Test MOTOR APPLIED VOLTAGE TEST 1 Carefully connect the 110VDC supply SUPPLY TURNED OFF to pins C and D on the travel motor connector See Figure B...

Страница 37: ...ING AND REPAIR B 28 B 28 LT 7 TRACTOR A B C 595 594 C B D A 647 646 559 561 FIGURE B 5 Travel Motor Connector Pins FIGURE B 6 Travel Motor Connector Pins Older Units with Powered Field TRAVEL MOTOR TE...

Страница 38: ...NOTES B 29 B 29 LT 7 TRACTOR...

Страница 39: ...actory warranty For your safety and to avoid electrical shock please observe all safety notes and precautions detailed throughout this manual If for any reason you do not understand the test procedure...

Страница 40: ...and remove the two socket head cap screws mounting the motor to the gear box housing Note The inspection cover plate has to be remove Step 5 to gain access to the two socket head cap screws 7 Careful...

Страница 41: ...DIAGRAMS C 1 C 1 LT 7 TRACTOR CONNECTION SCHEMATIC M15342 This diagram is provided for reference only It may not be totally applicable to all machine codes...

Страница 42: ...ARM CONTROL CABLE TO POWER SOURCE 2 4 31 32 21 75 76 77 GND 2 4 31 32 21 75 76 77 GND A B C D E F G H I CONTROL BOX GROUND GROUNDING LEAD PROTECTOR 4CR 563 539 541 539 532 TERMINAL STRIP GND 627 626...

Страница 43: ...NOTES C 3 C 3 LT 7 TRACTOR...

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