ESAB A6 GMD Manuel utilisateur

333 533--011 9704

A6 GMD

Joint tracking equipment

Simplified service manual

LIST OF CONTENTS Page

TECHNICAL DESCRIPTION 4..............................

INSTALLATION 8..........................................

OPERATION 10............................................

MAINTENANCE 12.........................................

DIMENSION DRAWING 13...................................

DIAGRAM 16...............................................

SPARE PARTS LIST A6 GMD 19.............................

Rights reserved to alter specifications without notice.

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WARNING

ARC WELDING AND CUTTING CAN BE INJURIOUS TO YOURSELF AND OTHERS.

TAKE PRECAUTIONS WHEN WELDING. ASK FOR YOUR EMPLOYER’S SAFETY

PRACTICES WHICH SHOULD BE BASED ON MANUFACTURERS’ HAZARD DATA.

ELECTRIC SHOCK -- Can kill

SInstall and earth the welding unit in accordance with applicable standards.

SDo not touch live electrical parts or electrodes with bare skin, wet gloves or

wet clothing.

SInsulate yourself from earth and the workpiece.

SEnsure your working stance is safe.

FUMES AND GASES -- Can be dangerous to health

SKeep your head out of the fumes.

SUse ventilation, extraction at the arc, or both, to keep fumes and gases from

your breathing zone and the general area.

ARC RAYS -- Can injure eyes and burn skin.

SProtect your eyes and body. Use the correct welding screen and filter lens

and wear protective clothing.

SProtect bystanders with suitable screens or curtains.

FIRE HAZARD

SSparks (spatter) can cause fire. Make sure therefore that there are no

inflammable materials nearby.

MALFUNCTION

SCall for expert assistance in the event of malfunction.

READ AND UNDERSTAND THE INSTRUCTION MANUAL BEFORE

INSTALLING OR OPERATING THE EQUIPMENT

PROTECT YOURSELF AND OTHERS!

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TECHNICAL DESCRIPTION

The A6 GMD joint tracking equipment is used for positioning and joint--tracking of

automatic welding machines with all types of joints in which there is a guide edge for the

sensor finger to follow. The equipment has been designed to suit standard ESAB slides, and

can control either one or two servo motors simultaneously.

Technical data

Joint tracking equipment A6 GMD

Control and operating voltage 42V AC 50--60 Hz

Power requirement 460 V A

Motor regulator, type Switched four--quadrant

Stator voltage, joystick control 40 V DC

Field voltage, separately excited motor 48 V DC

Enclosure type IP 53

Max. ambient temperature +45_C

Wei

hts:

Sensor and cross--sadle with mount 2.2 k

Joint tracking unit

4.5 kg

Sensor finger

0.6 kg

Remote control unit 2kg

Working range sensor, radially 360˚4mm

The figure below shows the working range and setting speed of the equipment.

For the A6 servo slide, see Simplified service manual no. 334 346--001.

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Normal gearing

Reversed gearwheels

cm/min Welding speed

Welding speed/Angular deviation

Maximum angular deviation of the weld joint in relation to the preset welding speed.

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The A6 GMD comprises:

1. Sensor, order no. 416 688--880

2. Control cable (2 m), order no. 416 749--887

3. Cross saddle for sensor, order no. 416 739--880

4. Control unit, order no. 416 065--880

5. Joint tracking unit, order no. 416 066--880

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For welding column and boom units the control box and the control cable (points 4 and 5

above) are replaced by product specific items.

Extra equipment for A6 GMD

SSensor finger, order no. 416 719--001 (L=100 mm)

SSensor finger, order no. 416 719--002 (L=150 mm)

SSensor finger for internal and external corners, order no 418 091--880

SAuxiliary control power transformer for separate power supply from mains:

190, 220, 380, 415, 440, 500 V 50 Hz

200, 230, 380, 415, 440, 500 V 60 Hz, to secondary 42V, 660 VA

see order no. 148 636--002

SCable3x2.5mm

2, for transformer, order no. 2626 134--04

SSensor cable with 90_--contact, order no. 418 091--887

SRubber guard bellows, order no 412 013--001

SBracket for control box 433 762--xxx. The bracket is available in different applications.

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ESAB standard servo slides for A6 GMD

SA6 servo slide of ball bushing type with permanently excited 42 V DC motor,

see 334 333

SA6 motorized slide, long travel, with sliding support and A6 VEC motor 42 V DC --

4000 rpm -- ratio 74:1, see 334 426

SMotor cable, order no. 417 310--xxx.

The cable is available in different lengths, see spare parts list.

Controls and connections

Control box

1. Indicating lamp, red

Lamp for joint tracking control. When lit, indi-

cates that the sensor finger is outside its

working range (vertically). The automatic

control devices are now blocked.

2. Illuminated pushbutton, orange

Selection of high speed for manual operation.

3. Joystick

For manual control of servo slide motions:

Up/Down and Left/Right. The joystick is always

in command. When the indicating lamp is out any

manual motion downwards is blocked.

4. Selector switch, 5 positions

Selection of joint location and joint tracking modes:

SManual pre--setting

SVertical and horizontal joint tracking

SVertical and horizontal joint tracking with search/location to right

SVertical and horizontal joint tracking with search/location to left

SVertical joint tracking

5. Indicating lamp, green

Power On indication.

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Joint tracking unit -- rear panel

1. Socket, 4--way

for connection of horizontal slide motor

2. Socket, 4--way

for connection of vertical slide motor

3. Socket, 8--way

for connection of guide finger

4. Socket, 23--way

for connection of control unit

5. Power supply, 42 V

6. Control circuit fuse,

10 A anti--surge (1 pc)

7. Switch

for selection of horizontal slide

direction of travel

8. Socket, 3--way

for joint memory unit (MEMO)

9. Switch

Power supply, On/Off

10. Spare socket

11. Socket, 8--way

for connection of Limit switch

Sensor

1. Sensor with cable connection for joint tracking unit and fixing device in front for the fit-

ting of different sensor fingers.

2. Sensor fingers.

3. 2 stop screws for adjustment of the horizontal flexibility of the of the fingers. The screws

are intended for the setting of the different joint types.

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INSTALLATION

1. For dimensions and settings, see Dimensions on page 13.

2. Connection, see page 16

Check that the necessary power supplies, of the correct voltage, are available.

SWhen using a power source of one of the types LAE 800 -- 1000 -- 1250 -- 1600,

connected for 42 V control voltage, the necessary power can be obtained from the

standard automatic welding machine -- see terminal PEG1.

SWhen suitable voltage is unavailable or when an LAH 500--630 42 V power source

is used, there must always be installed a 42 V intermediary transformer for the volt-

age supply to the A6 GMD (see ”Accessories” section).

3. See page 6 for details of the controls.

Commissioning of the joint tracking equipment

WARNING!

N.B. When the sensor is to be exchanged, the joint tracking equipment (ordering no

416 066--880) must be adapted to the supplied sensor (ordering no. 416 688--880).

N.B. In case the adaptation does not take place on installation, the joint tracking

function can be seriously impaired and mechanical damages may come about on the

control and contact devices through collission with the workpiece.

Trimming of the sensor voltage

1. Dismount the front panel of the control unit.

2. In case more space is needed for measuring, the regulator boards can be removed.

3. Connect a voltmeter to measuring point TP1--TP0.

4. Run the vertical slide downwards by way of the remote control unit until the tip of the

sensor finger contacts a flat base and the warning lamp on the remote control unit goes

out.

5. Set the selector switch on the remote control to vertical tracking.

6. Move the finger tip aside as far as possible.

7. Check the value on the voltmeter and adjust with

potentiometer R20 to 1,8 +/-- 0.6 V, see figure below.

Don’t touch potentiometer R32.

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8. Fit the sensor so that there is the least possible angle between the longitudinal axis of the

sensor and the weld joint, in both the horizontal and vertical planes less then 35_.

(See the drawing on page 13 and 14)

9. When fitting the sensor, ensure that the front part of the sensor finger (secured by a uni-

versal joint) is pointing downwards towards the weld joint or towards the edge to be

sensed/tracked. This applies for all types of joints, including fillet welding when the

welding head is inclined. The sensor must not be radially misaligned by more than +/--

3_from this position in relation to the axes of the slide cross.

Any large deviation towards one side or the other puts the control performance at risk,

see page 13 and 14.

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10. The equipment includes a fixing device for securing the sensor with a type D20 or D35

contact block. This allows course setting of the welding direction, height and angle round

the contact block. Important! The distance B between the steel clamp A and live parts

should be at least 5 mm.

11. Use the mini slide cross--head for exact adjustment of the position of the tip of the wire in

the welded joint. Adjust, too, the distance between the tip of the wire and tip of the guide

fingerifnecessary.

The mini--slide can be adjusted till no play exists by means of the stop screws on the

runner.

12. Check as follows that the sensor is operating correctly:

STurn the selector switch to

SUsing the joystick, run the vertical slide downwards towards a flat base until the tip

of the guide finger contacts the base. Continue to lower the slide until the red indi-

cating lamp goes out.

STake hold of the tip of the guide finger and push it to one side or the other. If the

equipment is working correctly, the horizontal slide motor should then start and

move in the same direction as the sensor tip is being pushed. If this does not

happen,change over the switch marked on the apparatus unit backplane.

13. As supplied, the tip of the sensor is straight, but can be bent by the user to suit a particu-

lar application or be replaced by some other type or shape of sensor,

see ”Extra Equipment for A6 GMD”.

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OPERATION

The joint tracking equipment is adjustable for different kinds of joint tracking, such as

tracking by sensing the edge and tracking by sensing the groove. The adjustment is made both

on the control box and on the sensor.

SJoint tracking by sensing the edge:

Set the selector switch on the control box to or depending on whether the de-

sired sensing direction is left or right. The two stop screws shall be screwed home, see

figure on page 7. This means that the sensor fingers are laterally spring--loaded and thus

permit edge sensing. Joint tracking by sensing the edge is used for fillet joints and similar

joints, see also table below.

SJoint tracking by sensing the groove:

Set the selector switch on the control box to or depending on whether vertical

and horizontal sensing is desired or vertical sensing only. The two stop screws shall be

screwed out at least two turns or to stop, see figure on page 7. This will disengage the

spring--load of the sensor fingers and permit groove sensing. If the stop screws are not

screwed out there is a risk that the sensor fingers start ”climbing” the joint walls of shal-

low V and U joints. See also joint table below for correct settings.

Examples of some different types of joints and of the guide finger angle against the

guiding edges.

Joint type Settings, control box

Double--flanged butt joint

I--weld

A=Guide bar

V--weld

1/2 V--weld

U--weld

Table des matières

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