WFU12A-RV

WFU12A-RV

Description

Wire Feed Unit

Processes

Important Information

All persons authorised to use, repair or service the WFU12A-RV wire feed unit, should read the section on safety, before any work is undertaken. Further information is available in publication HSG118

'Electric safety in arc welding', which may be obtained from the

Health & Safety Executive. Please contact your distributor should you not understand any of the information within this document.

INSTRUCTION MANUAL

Newarc Equipment Ltd.

UK‘s Leading Manufacturer Of Welding Equipment

Newcastle +44 (0) 191 295 0111

Aberdeen +44 (0) 1224 771 063

www.newarc.co.uk

To maintain continued developments of our products we reserve the right to alter specifications as quoted without prior notice

TABLE OF CONTENTS

SECTION 1 — SAFETY

1.1 Servicing Hazards _________________________________________________________ 4

SECTION 2 — SPECIFICATION

2.1 - Description_______________________________________________________________ 5

2.2 - Technical Data___________________________________________________________ 5

SECTION 3 — INSTALLATION

3.1 - Connecting to the Power Source_________________________________________ 6

3.2 - Fitting the Wire Spool_____________________________________________________ 7

3.3 - Adjusting the Brake Tension_______________________________________________ 7

3.4 - Connecting the Welding Torch____________________________________________ 7

3.5 - Feeding the Wire Through the Torch_______________________________________ 7

3.6 - Connecting the Gas Hose________________________________________________ 7

SECTION 4 — OPERATION

4.1 - Operating Controls MF34_______________________________________________ 8

4.2 - Operating Controls MF37_______________________________________________ 9

4.3 - Operation Controls MF33_______________________________________________ 10

4.3 - MIG Welding___________________________________________________________ 10

4.4 - Voltage Reference_____________________________________________________ 11

SECTION 5 — FAULT FINDING AND MAINTENANCE

5.1 - MIG Welding Problems_________________________________________________ 12

5.2 - Maintenance__________________________________________________________ 12

SECTION 6 — ELECTRICAL DIAGRAMS

6.1 - System Diagram________________________________________________________ 13

SECTION 7—PARTS BREAKDOWN

7.1 - Component Locations__________________________________________________ 14

7.2 - Parts List_______________________________________________________________ 16

3

WFU12A-RV

SECTION 1 — SAFETY

1.1 Servicing Hazards

Fire and Explosions

Pay attention to fire and safety regulations in force at the welding site.



Remove all flammable or combustible materials from the welding area and the immediate vicinity.



Suitable fire fighting equipment must always be present where welding is undertaken.



Be aware that a fire risk is present for a considerable time after welding operations have ceased because of sparks and hot slag etc. Take suitable precautions when you have finished welding.



Take care when welding containers that have held flammable or combustible material, these should have been specially cleaned before being made available to the welder. If in doubt do not proceed.

Burns

Be aware that burns may be the result of the heat involved in the welding process, welding spatter or the Ultra Violet Radiation given off by the arc itself.



Wear suitable flame retardant clothing over all your body.



Wear protective gauntlets designed for welding use.



Wear a welding facemask fitted with the correct filter shade suitable for the current at which you will be welding.



Avoid wearing oily or greasy clothing as a spark may ignite them. Where possible ensure that a suitable first aid kit and a first aid person qualified in the treatment of burns are available nearby.

Fumes

Welding operations give off harmful fumes that are hazardous to your health.



Make sure the welding area is well ventilated. Use suitable fume extractors or exhaust fans if necessary.



If the ventilation is not suitable then breathing apparatus may have to be used.



Do not weld plated metals or metals which contain Lead, cadmium, Zinc, Mercury or Beryllium unless you are wearing breathing apparatus approved for the purpose.

Electric Shock



Do not touch live electrical parts.



Do not work in wet or excessively humid areas.



Avoid touching the work piece whilst welding.



Keep your clothing and body dry.

4

The safe handling of gas cylinders

The WFU-12 wire feed units use argon mix or CO welding. These are inert gases and can displace oxygen in the atmosphere leading to asphyxiation.

2

gas during MIG



Note! Gas cylinders are under pressure and can explode if punctured. Please ensure the cylinder is secured in a stable location away from any heat source or potential mechanical damage.



Always place the gas cylinder on the rear shelf of the power source and securely fasten it using the securing chain supplied. If it is not desired or possible to place the cylinder on the cylinder carrier of the power source then the cylinder must be securely fastened to a wall or placed in a specially designed cylinder carrier.



Do not use gas cylinders whose contents you are unsure of.



Check the gas cylinder, pressure regulator and gas hoses regularly for leaks and discard any suspect item.



Do not connect directly to a gas cylinder without using a pressure-reducing regulator designed for use with argon mix or CO

2

.



Always install and use pressure regulators in accordance with the manufacturers instructions



It is advisable when attaching the regulator to the gas cylinder to briefly turn on the cylinder valve to expel any foreign objects that may be present. These may later block the solenoid valve of the machine if not dealt with.

Turn your face away from the cylinder valve when undertaking this action.



Always turn off the valve on the gas cylinder when you have finished welding.

Further information is available in publication HSG118 'The safe use of compressed gases in welding, flame cutting and allied processes' which may be obtained from the Health & Safety Ex-

ecutive.

Welding and earth return cables



Earth return cables must have a cross sectional area of at least 35mm

2

.



Only use copper cables, the use of Aluminium cables may have a detrimental effect on the performance of the machine.



Regularly inspect welding cables and connectors for wear abrasion and corrosion. Corroded cables and connectors may overheat and become a fire hazard.



Ensure that all welding connectors are fully mated, the connectors should be pushed fully home and then turned clockwise to lock. If the connectors are not mated fully then they may overheat and become a fire hazard.



If possible, fasten the earth return clamp directly to the job to be welded and ensure that the surface is free from rust and paint.

WFU12

SECTION 2 — SPECIFICATION

5

2.1 - Description















The New-Arc WFU12A-RV wire feeders have been designed with increased environmental protection. They are built into a strong, durable plastic case using Zinc coated chassis components to give both great strength and protection when used in damp conditions.

The wire feed unit is designed to work in conjunction with the Newarc range of inverter based power sources and provides the following functions: -

Powerful 4 roll wire drive system with electronic feed-back to provide accurate and stable wire feed

Digital display of wire feed speed and voltage, wire speed may be set in either inches or meters per minute.

Adjustable burn back time.

Adjustable slow start time.

Adjustable initial start voltage.

Adjustable pre-gas and post-gas time.

2T or 4T gun switch latching.





Wire inch and gas purge buttons.

Display activity (displays how many hours the wire feeder has been in use).

Above specification with MF-34 panel fitted

2.2 Technical Data

Technical Data

Current Rating

Wire Diameter

Max Wire Spool Size

450 amps @ 60%

350 amps @ 100%

0.8mm - 2.0mm

30cm / 12"

Wire Speed Range

Input Voltage

Voltage Control

0 - 23 m/min

24V AC

Yes

Digital Display (With MF34 or MF37 Option) Yes

Weight (kg)

Degree of protection

12Kg

IP53

WFU12A-RV

SECTION 3 — INSTALLATION

6

3.1 - Connection to Power Source

Only use copper welding cables with a cross sectional area of

35mm

2

or more. Use the graph below to calculate the cable size suitable for the required welding distance.

Note! The figures on the graph are for a duty cycle rating of

60%. The total welding circuit includes the power and the earth leads.

 For straight polarity welding, connect the power in connector on the rear of the wire-feeder to the +ve connector on the power source.

 Connect the welding earth lead to the -ve connector on the power source and attach the earth clamp to the workpiece.

WFU12A-RV

SECTION 3 — INSTALLATION

3.2 Fitting wire spool

The feed rollers must always be selected to match the size of the electrode wire being used.

The feed rollers fitted to the wire-feeders normally have two different sized grooves.

 Make sure that the outlet wire guide located inside the torch adapter is of the correct size for the wire being used.

 Open the pressure lever on the wire drive assembly.

 Remove the retaining nut on the spool holder and fit wire spool so that the locating pin on the spool holder fits into corresponding hole in the wire reel.

 Replace the retaining nut on the spool holder.

 Release the end of the wire from the spool and cut off the bent length, take care that the wire does not spill off the spool

 Insert the wire through the rear wire guide, over the drive rollers and through the outlet wire guide so that approximately 5cm of wire is protruding from the torch adapter.

 Close the pressure roller ensuring that the wire lays in the drive roll groove.

3.3 Adjusting Brake Tension

 Remove the spool-retaining nut.

 The head of the brake adjusting screw is now visible in the centre of the spool holder.

 Turn the screw clockwise to tighten the brake and anti-clockwise to slacken it.

 It is advisable to check the tension every time a new spool of wire is fitted as it is the extra weight of a full spool that generally causes problems with the spool over-running and wire spilling off the spool.

7

3.4 Connecting the Welding Torch

 Make sure that the liner and contact tip fitted to the torch are of the correct size for the wire being used.

 Attach the welding torch to the torch adapter on the wire feed, making sure that the torch liner retaining nut goes over the wire protruding from the torch adapter.

 Line all the connections on the torch up with their relevant sockets in the torch adapter and screw the torch onto the wire feeder. Note the

torch should screw easily onto the wire feeder, if any resistance is felt - do not force the torch onto the wire feeder.



3.5 Feeding the Wire through the torch

Set the wire feed speed control to about half way.

 Keeping the welding torch as straight as possible press the wire inch button until the wire is fed through the torch and out through the contact tip.

 The wire pressure lever adjuster should be set so that when the wire is restricted at the welding torch the drive rollers will slip. Setting the tension too high may cause the wire to build up inside the wire drive assembly as well as cause excessive loading of the motor which will result in a reduced duty cycle.

3.6 Connecting the Gas Hose

Refer to safety precautions in section 1

A Gas hose suitable for use with Argon or CO

2

up to a pressure of 10 bar (150 psi) should be connected between the pressure regulator on the gas cylinder and the gas connection on the rear of the wire feed unit. Do not over-tighten this connection.

Note! The pressure regulator should be set between approximately 3 and 5 bar for normal use.

WFU12A-RV

SECTION 4 — OPERATION

4.1 Operational Controls for MF34 Front Panel

8

1

2

3

4

1. Adjustment Control a. Press the control knob once to alternate between voltage and wire speed. b. Double press the control knob to access the additional parameters.

 Program Mode (Only available on programmable version)

 Burn Back

 Start Voltage

 Slow Start

 Pre Gas

 Post Gas c. Once these settings have been adjusted, wait for

3 seconds and a beep will indicate that they have been saved. d. Any settings which have been adjusted during the welding process will automatically be saved after welding has finished and the 3 seconds has elapsed. e. Press and hold the control knob to access the advanced menu.





Meters/Inches (Turn knob to select).

Activity Counter - this is a log, in hours, of how long the unit has been in operation. Turn the knob to view the total hours.

 Overload Delay - Dictates the length of time it takes to display a fault condition when the motor is being overloaded.





Version - Indicates the program version.

Overload Level - Dictates the sensitivity of the overload function. f. Pre set Programs (Only available on programmable version) - Once all of the preferred parameters have been set, it is possible to save them to a program.

Double press the control knob to access the additional parameters menu and scroll to a program number before pressing and holding the control knob to save. To load programs that have previously been saved, scroll to the program number and press the control knob once.

2. Wire Inch - Initiates wire-feed without having to press the MIG torch switch, Used when feeding the wire through the torch when changing spools.

3. Gas Test - Press to test gas flow.

4. Torch - Changes the mode of operation of the

MIG torch switch between 2T and 4T. In 2T, the

MIG torch switch is pressed to start welding and released to stop. In 4T, the torch switch is pressed and released to start welding and pressed and released again to stop welding.

WFU12A-RV

SECTION 4 — OPERATION

4.2 Operational Controls for MF37 Front Panel

Display 1

1

Display 2

2

3

9

1. Adjustment Control for left display

2. Adjustment Control for right display

3. Mode select push button

Note: On initial power up the display will give the option to select Welding arc voltage correction (if the optional Voltage reference PCB is fitted).

Turn the left hand knob(1) to select:- turn it right to select YES or left to select NO. The Auto led on the front panel will light when auto mode is selected.

After initial power up.

Note: The last digit of the display indicates a letter to show the option mode selected.

The following options are shown and can be adjusted with the corresponding knob.

Display1/knob1 Display2/knob2

Voltage (U)

Pressing the mode button (3) allows other options to be displayed on the two displays and changed using the knob below the corresponding display.

Display1/knob1 Display2/knob2

Latch (L)

(S) Post Gas (P)

Last welding results display: Volts (U) and amps

(A)

Any settings that are changed are saved after a 3 second period.

During welding the MF37 displays the Voltage (U) and current (A) of the welding arc if the optional

Current transducer LEM circuit is fitted.

If the MF37 is left idling for more than 4 minutes the panel goes into standby made. This is indicated by a small red LED in display2 pulsing on and off. To reactivate the panel press or turn anything on the

MF37 panel or press the MIG torch switch.

WFU12A-RV

SECTION 4 — OPERATION

4.3 Operational Controls for MF33 Front Panel

3

1

2

4

1. Burn back adjustment - This determines how much of the wire is left sticking out of the contact tip when welding is stopped. Too much wire and there is a chance of it 'freezing' in the weld pool as it cools, too little and there is a chance that the wire will burn back on to the contact tip, necessitating changing of the tip. Adjusting the control anti-clockwise increases the amount of wire sticking out of the tip and adjusting it clockwise reduces it.

2. Wire speed control - Adjusts the speed of the wire feed system up to a maximum of 23m/min.

3. Voltage control - Controls the welding voltage when used in conjunction with a New-Arc

R4/5000 multi-process or constant voltage power source.

4. Latch - Changes the mode of operation of the MIG torch switch between 2T and 4T. In 2T, the

MIG torch switch is pressed to start welding and released to stop. In 4T, the torch switch is pressed and released to start welding and pressed and released again to stop welding.

4.4 - MIG Welding











It is assumed that the wire and welding torch have been fitted as per the installation part of this manual.

Set the Voltage control and wire speed controls proportional to the thickness of metal to be welded.

Select the welding torch mode required.

Ensure the gas cylinder is turned on and the flow-meter or regulator is set to give approximately 15 to 20 Litres per minute. (30 to 40 cubic feet per hour).

Until you are familiar with the machine it is preferable to start welding on a piece of waste material the same type and thickness as the work-piece, adjust the voltage control (if fitted), wire feed and gas flow until the required welding condition is achieved.

When used with New-Arc power sources all the controls can be adjusted whilst welding without damaging the machine.

WFU12A-RV

10

SECTION 4 — OPERATION

4.4 Voltage Reference (option)

11

When welding in MIG mode there is always a voltage drop associated with the losses in the welding cables and the operator must always set the power source output higher than the required arc voltage to overcome this loss.

The WFU12 wire feeders has an optional automatic voltage control system that automatically adjusts the power source output to compensate for voltage drop caused by the welding cable losses.

The operator may set the voltage and wire feed speed on the front panel of the wire feeder before welding with the knowledge that any losses in the interconnection cables and earth lead will be automatically compensated for. It is possible to increase or decrease the welding interconnection length without any change to the wire feeder settings and still maintain the set arc voltage.

The automatic voltage control system is ideal for welding applications where the point of welding is some way from where the power source is sited.

For the automatic voltage control to work correctly the voltage reference lead must be connected directly to the welding work and must remain connected in order to ensure an accurate reading of arc voltage.

WFU12A-RV

SECTION 5 — FAULT FINDING AND MAINTAINANCE

5.1 MIG Welding Problems

Porosity (holes) in weld - Has two common causes:-

12

5.2.1 Weekly



Clean the exterior of the machine and remove any dirt and pieces of MIG wire that may have collected inside the wire spool compartment.

1. Lack of shielding gas caused by the flow-meter not being set correctly, damage to any of the gas hoses or MIG torch, a build up of spatter inside the MIG torch nozzle or dispersal of the gas shield by the wind or fume extraction system ,

2. Poor surface condition of the weld metal caused by inadequate surface preparation or contamination by oil, grease or paint.



Remove any build up of dirt from the wire feed rollers.



The wire tension adjuster should be set so that when the wire is restricted at the welding torch the drive rollers slip. Remember if the pressure is set too high the wire may pile up behind the front wire guide and undue strain will be put on the wire feed system leading to a reduced duty cycle and lifespan.

Wire burns back to contact tip - Caused by voltage being too high for wire feed speed, wire feed restricted by blocked tip or liner, insufficient tension on pressure roller or excessive brake tension on spool holder.



If necessary, adjust the brake tension on the spool holder so that the wire spool stops at the same time as the feed rollers.



Inspect the machines exterior for obvious signs of damage.



Check the condition of the welding cable, earth clamp and welding connectors for damage and any sign of over-heating.

Cold arc with excessive spatter and weld bead too high

(convex). - Caused by the voltage being too low for the wire feed speed or metal thickness, inductance control on power source incorrectly set, the power cables between the power source and wire-feed are either too long or of inadequate cross section and are causing a voltage drop or the MIG torch or earth lead are damaged.



Check the gas hose and regulator for leaks, remember that air leaks can result in weld porosity.



Check the condition of the MIG welding gun, check for cuts in the cable sheath, condition of the liner and condition of the contact tip. Remove any build up of spatter from inside the gas nozzle.

Hot arc with large irregular spatter and weld bead too

flat, or even concave - Wire feed too slow or voltage set too high.

Wire glows red hot and reluctant to arc - Power source set to MMA (constant current), either switch power source to MIG (constant voltage) or set wire feeder to constant current setting (ILS version only).

5.2.2 Three monthly

As per the weekly schedule, plus:-



Remove the cover from the machine and remove the build up of dust and debris from inside the machine.

Either use compressed air at low pressure or an industrial vacuum cleaner.



Make a thorough visual inspection of the interior of the machine, look particularly for pieces of welding wire and other foreign matter.

5.2 Maintenance

Note! All Electric shocks are potentially fatal, switch the machine off and unplug from the mains supply before undertaking any maintenance work.

It is very important that the wire feed unit is regularly maintained. The amount of use and the working environment must be taken into account when scheduling the maintenance periods.

Careful use and regular preventative maintenance will prolong the life of the machine and ensure trouble free operation.



Check the condition of the weld current input connector and Euro socket, look for any signs of discolouration due to overheating, this is generally caused by poor connection of the welding power leads due to poor quality welding connectors and can be a common cause of welding set failure.



Check that the gas solenoid retaining nut is secure and that the gas hose inside the machine is in good condition and shows no sign of kinking or of rubbing on any internal component.

5.2.3 Annually

As per the three monthly schedule, plus :-

Have the wire feeder calibration checked, if necessary have the machine re-calibrated by a New-Arc trained technician.

WFU12A-RV

SECTION 6 — ELECTRICAL DIAGRAMS

6.1 - System Diagram

13

WFU12A-RV

SECTION 7—PARTS BREAKDOWN

7.1 - Component Locations

1

2

3

4

14

5

6

7

8

WFU12A-RV

SECTION 7—PARTS BREAKDOWN

7.1 - Component Locations

9

10

WFU12A-RV

11

12

13

14

15

8

9

4

5

6

SECTION 7—PARTS BREAKDOWN

7.2 - Parts List

Item no Description

1 Wire feed motor rollers

0.6 - 0.8 V’

0.8 - 1.0 ‘V’

1.0 - 1.2 ‘V’

1.2 - 1.6 ‘V’

0.6 - 0.8 knurled

1.0 - 1.2 knurled

1.2 - 1.6 knurled

1.6 - 2.0 knurled

0.8 - 1.0 Aluminium

1.0 - 1.2 Aluminium

Spool holder cap

Voltage measurement interface PCB

Motor Drive PCB

LEM 5V LEM Current transducer

MF33 Front Panel Assembly

MF37 Front Panel Assembly

MF34 Front Panel Assembly

11 Panel mounted dix socket 10-25mm

13 Panel mounted remote socket

14 Panel mounted dix plug

Ribbon Cable Assembly RV

Ribbon Cable Assembly RV with Voltage ref. PCB

Motor Drive PCB Wiring Harness

Voltage Reference lead

WFU12A-RV

Part no.

M83001

M00381N

M00380N

M00382N

M00391N

M00924

M00382NK

M00392

M00877

M00427N

M00393N

M00369

M01724

M90873

M90864

M00024

M60249

M90872

M91142

M90863

M01404

5510004

M00022A

M00101

M00036

M90226

TBA

M90867

M90741

16

WFU12A-RV

17

WFU12A-RV

18

Head Office

6 Wincomblee Road

Walker Riverside

Newcastle upon Tyne

NE6 3PF

Tel: +44 (0)191 295 0111

Fax: +44 (0)191 295 0077

Website: www.newarc.co.uk

e-mail: [email protected]

Aberdeen Office

Unit 23 Kirkhill Place

Kirkhill Industrial Estate, Dyce

Aberdeen

AB21 0GU

Tel: +44 (0)1224 771063

Fax: +44 (0)1224 724536

Guarantee

New-Arc Equipment Ltd warrants that its goods and services are guaranteed to meet the specific performance under the stated conditions of use. New-Arc cannot be held responsible for general wear and tear or for failure occurring due to misuse or abuse arising out of circumstances outside the stated conditions of use. The stated conditions of use are that considered normal industrial practice and are not exhaustive. Each machine is identified with a unique serial number and accompanied with the guarantee. New-Arc reserve the right to a) Repair. b)Replace. c)Authorise the reasonable cost of repair or replacement at an approved New-Arc service agent. d)Credit for any purchased equipment (less reasonable depreciation for actual use and condition) at its entire discretion. This in no way affects your rights as a consumer. The guarantee is enclosed with each machine.

Waiver

Whilst every endeavour is made to ensure the details of this document are correct at the date of print. New-Arc accepts no liability for correctness in respect of any impending change in legislation or health and safety requirements. New-Arc also reserve the right to amend the detail of the document content without any notification to the consumer. If reference is made to New-Arc while utilising the document for spare parts purchase or instruction please advise the revision of the document to ensure correctness of information.

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