ESAB Migmaster 203 User manual

0349 300 050 Valid for serial no. 421/402/429--xxx--xxxx071024

Migmaster 173/203

Migmaster 253

S

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READ THIS FIRST 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INTRODUCTION 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TECHNICAL DATA 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WIRING DIAGRAM, Migmaster 173 / 203 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Component description 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Migmaster 173, 230V 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Migmaster 203, 230/208V 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Migmaster 203, 230/208V (diagram valid for S/N up to 4024460302) 10. . . . . . . . . . . . . . . . . .

Migmaster 203, relay KIT (gas valve, spool gun) connections 11. . . . . . . . . . . . . . . . . . . . . . .

DESCRIPTION OF OPERATION 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1 Control board 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:1 Power supply 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:2 Reference circuit 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:3,4,5 Start / Stop, Thermal overload, Spot welding 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:6 Burnback time 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:7 Control amplifier and pulse width modulator 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:8,9 Motor driving / braking 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1 -- Migmaster 173 / 203 component positions 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

WIRING DIAGRAM, Migmaster 253 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Component description 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Migmaster 253, 230/208V 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Migmaster 253, 230/208V (diagram valid for S/N up to 429 449 0050) 22. . . . . . . . . . . . . . . .

Migmaster 253, relay KIT (gas valve, spool gun) connections 23. . . . . . . . . . . . . . . . . . . . . . .

DESCRIPTION OF OPERATION 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1 Control board 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:1 Power supply 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:2 Start / Stop 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:3 Spot welding 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:4 Wire feed speed 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:5 Motor driving / braking 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:6 Burnback time, contactor, gas valve 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1:7 Thermal overload cutout 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AP1 -- Migmaster 253 component positions 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AR Control board 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AR component positions 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AR diagram 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SERVICE INSTRUCTIONS 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

What is ESD? 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Thermal switch (thermostat) replacement procedure 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTRUCTIONS 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SAFETY 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLATION 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Placing 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Assembly of components 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical installation 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mains power supply 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATION 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Switching--on and overheating protection 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operation 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MIG process set--up guide 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setting the wire feed pressure 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MAINTENANCE 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection and cleaning 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

FAULT TRACING 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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ORDERING OF SPARE PARTS 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NOTES 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Edition 071024

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1sM1725

READ THIS FIRST

Maintenance and repair work should be performed by an experienced person, and

electrical work only by a trained electrician. Use only recommended replacement parts.

This service manual is intended for use by technicians with electrical/electronic training for

help in connection with fault--tracing and repair.

Use the wiring diagram as a form of index for the description of operation. The circuit

board is divided into numbered blocks, which are described individually in more detail in

the description of operation. All component names in the wiring diagram are listed in the

component description.

This manual contains details of all design changes that have been made up to and

including October 2007.

The Migmaster 173/203/253 are designed and tested in accordance with international

and European standard IEC/EN 60974--1 and EN 60974--10.

On completion of service or repair work, it is the responsibility of the person(s) etc.

performing the work to ensure that the product does not depart from the requirements

of the above standard.

INTRODUCTION

Migmaster 173/203/253 are step controlled power sources in a compact design,

intended for welding with solid steel, stainless steel or aluminium wire as well as

tubular wire with or without shielding gas.

The possibility of welding with homogeneous wire/shielding gas and welding with

gasless tubular wire is obtained by switching the + and -- connections on the

switching terminal by the wire feed unit.

Do not dispose of electrical equipment together with normal waste!

In observance of European Directive 2002/96/EC on Waste Electrical and Electronic

Equipment and its implementation in accordance with national law, electrical equipment

that has reached the end of its life must be collected separately and returned to an

environmentally compatible recycling facility. As the owner of the equipment, you should

get information on approved collection systems from our local representative.

By applying this European Directive you will improve the environment and human health!

Edition 071024

-- 5 --1sM1725

TECHNICAL DATA

Migmaster 173

Voltage 230V, 1∼ 50/60Hz

Permissible load at

100% duty cycle 76A

60 % duty cycle 98A

20 % duty cycle 170A

Setting range (DC) 30A/15.5V--170A/18.5V

Open circuit voltage 19.5--35.0V

Open circuit power 160W

Power factor at max load 0,90

Control voltage 42V, 50/60Hz

Wire feed speed 40--670ipm (1.0--17m/min)

Burnback time 0.02--0.25s

Spot welding 0.2--2.5s

Welding gun connection EURO

Wire dimension range

Fe

Al

FCW

.023--.030” (0.6--0.8mm)

.035--.040” (0.9--1.0mm)

.030” (0.8mm)

Max diameter/weight

of wire bobin

12” (300mm)/33lb (15kg)

Dimensions lxwxh 33x16x28” (860x420x730mm)

Weight 130lb (59kg)

Operating temperature 14÷104F (--10 ÷ +40

o

C)

Enclosure class IP 23

Application classifica-

tion

Migmaster 203 Migmaster 253

Voltage 230V, 1∼ 50/60Hz 230V, 1∼ 50/60Hz

Permissible load at

100% duty cycle 90A 110A

60 % duty cycle 115A 140A

20 % duty cycle 200A 250A

Setting range (DC) 30A/15.5V--200A/22V 40A/16.0V--250A/23V

Open circuit voltage 18--38V 19.5--43V

Open circuit power 140W 200W

Power factor at max load 0.83 0.92

Control voltage 42V, 50/60Hz 42V, 50/60Hz

Wire feed speed 40--670ipm (1.0--17m/min) 75--748ipm (1.9--19m/min)

Edition 071024

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1sM1725

Burnback time

0.02--0.25s 0--0.25s

Spot welding 0.2--2.5s 0.2--2.5s

Welding gun connection EURO EURO

Wire dimension range

Fe

Al

FCW

.023--.045” (0.6--1.1mm)

.035--.040” (0.9--1.0mm)

.030--.045” (0.8--1.1mm)

.023--.045” (0.6--1.1mm)

.040--3/64” (1.0--1.2mm)

.030--.045” (0.8--1.1mm)

Max diameter/weight

of wire bobin

12” (300mm)/33lb (15kg) 12” (300mm)/33lb (15kg)

Dimensions lxwxh 33x16x28” (860x420x730mm) 33x16x28” (860x420x730mm)

Weight 150lb (68kg) 216lb (98kg)

Operating temperature 14÷104F (--10 ÷ +40

o

C) 14÷104F (--10 ÷ +40

o

C)

Enclosure class IP 23 IP 23

Application classifica-

tion

Duty cycle

The duty cycle refers to the time as a percentage of a ten--minute period that you can weld at a cer-

tain load without overloading.

Enclosure class

The IP code indicates the enclosure class, i. e. the degree of protection against penetration by solid

objects or water. Equipment marked IP23 is designed for indoor and outdoor use.

Application class

The symbol indicates that the power source is designed for use in areas with increased

electrical hazard.

Edition 071024

-- 7 --1sM1725

WIRING DIAGRAM, Migmaster 173 / 203

Component description

WARNING !

STATIC ELECTRICITY can damage circuit

boards and electronic components.

S

SS

S Observe precautions for handling electrostatic

sensitive devices.

S

SS

S Use proper static--proof bags and boxes.

ESD

AP1 Circuit board

AP2 Digital instrument, accessory

C1, C2, CVS Capacitor 0,1uF/250V

EV1 Fan

KM1 Contactor 42V, 50--60Hz

L1 Inductor

L2, L3 Ferrite core

LF1 Lamp, white, On/Off, 230V

M1 Feed unit motor

QF1 Switch, ON/OFF

QF2 Switch, 8--step welding voltage selector for C170

Switch, 12--step welding voltage selector for C200

RO Resistor 15Ω/20W

RVS Resistor

RP1 Potentiometer, wire feed speed

RP2 Potentiometer with switch, spot welding

RI Shunt, accessory

RL Resistor

ST1 Thermal oveload cutout, operates at 130

o

C. The cutout is mounted at

the cooling fins of the diode bridge.

TC1 Control transformer

TC2 Transformer for CO2 heater, accessory

TC3 Transformer for digital instrument, accessory

TM1 Main transformer

V1 Diode bridge

VH LED yellow indication, thermal overload

Edition 071024

-- 8 --

1sM1725

XTP Main welding current contact, single -- pole

XT1, XT4 Terminal block

YV1 Gas valve

Edition 071024

-- 9 --1sM1725

Migmaster 173, 230V

Edition 071024

-- 10 --

1sM1725

Migmaster 203, 230/208V

Edition 071024

after delivery machine was

modified according to diagram

on page 12

-- 11 --1sM1725

Migmaster 203, 230/208V (diagram valid for S/N up to 4024460302)

Edition 071024

-- 12 --

1sM1725

Migmaster 203, relay KIT (gas valve, spool gun) connections

Edition 071024

-- 13 --1sM1725

DESCRIPTION OF OPERATION

AP1 Control board

clka1e03

Edition 071024

-- 14 --

1sM1725

clka1e04

Edition 071024

-- 15 --1sM1725

AP1:1 Power supply

clka1e06

Transformer TC1 supplies indicating lamp HL1 and rectifier bridge BR1

with 27 V AC. The unsmoothed DC output from BR1 is smoothed by capacitors

C5 and C25 to produce an open--circuit voltage of 38 V ”10%.

This provides the power supply for the wire feeder motor.

Connections T6 and T7 supply 20 V AC from transformer TC1 to diodes D18 --

D21. The rectified voltage is about 24 V in the fan--cooled machines and

somewhat higher in the 3--phase LKA 180. This supply powers fan EV1 in the

fan--cooled machines. Voltage regulator VR1 is supplied via diode D1 to

provide a regulated 15 ᐔ0.6 V supply.

AP1:2 Reference circuit

clka1e07

Potentiometer R49 controls the wire feed speed and is connected to terminals

P1 -- P3. It is energised via resistors R51 -- R55 and R23. The reference

voltage is supplied through resistor R20 to the error amplifier.

Edition 071024

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1sM1725

AP1:3,4,5 Start / Stop, Thermal overload, Spot welding

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Start / Stop circuit

When the torch trigger switch SB1 is not activated, the voltage between M3

and M4 is 24 V. Pressing the trigger switch shorts the circuit, producing a

voltage of 0 V between M3 and M4.

Thermal overload circuit

The machine contains two thermal overload cutouts, wired in series and

connected to inputs T8 and T9. If either of them operates, the torch trigger

switch circuit cannot be short--circuited, with the result that wire feed cannot be

started. When either of the thermal cutouts has operated, LED V7 is energised

to indicate this via diode D7.

Spot welding circuit

Potentiometer R50 controls the spot welding time and incorporates a switch.

When in the zero position, the switch is open.

When the switch in R50 and torch trigger switch SB1 are closed, capacitor C22

charges up through resistors R32 and R50. Wire feed stops when the voltage

on C22 reaches 8.8 V. The trigger switch must be released and then pressed

again before a new spot weld can be made.

The spot welding time can be adjusted between 0.2 and 2.5 seconds ᐔ30%.

Edition 071024

-- 17 --1sM1725

AP1:6 Burnback time

clka1e09

The burn--back time is the time from when wire feed ceases until contactor

KM1 drops off.

During welding, the voltage at pin 13 of IC2 is low. The output of the inverter

at pin 14 is therefore high, turning on transistor Q2 and activating relay RE1.

When the torch trigger switch is released, or when the spot welding time

expires, capacitor C23 charges up via resistors R36, R37 and R38. When the

voltage across C23 reaches 8.8 V, output 14 of IC2 goes low, turning off Q2

and causing relay RE1 to drop off.

AP1:7 Control amplifier and pulse width modulator

The control amplifier compares the set value speed signal with the actual

speed and supplies a control signal to the pulse width modulator. The actual

value speed signal is provided by measuring the motor voltage.

The pulse width modulator controls the frequency and pulse time of current to

the wire feed motor.

Edition 071024

-- 18 --

1sM1725

AP1:8,9 Motor driving / braking

clka1e10

Motor driving circuit

The output stage of the pulse width modulator is connected to transistor Q1 via

resistor R16.

A motor current signal is provided by measuring the voltage across resistor R4,

connected to transistor Q1. If the voltage across R4 exceeds 1.1 V ᐔ60 mV,

the gate pulses to Q1 are inhibited. This provides a current limit of about 11 A.

Motor braking circuit

When wire feed is to stop, the pulse width modulator turns off the pulses to Q1.

Transistors Q3 and Q4 turn on: transistor Q4 provides a path for dynamic

braking current to flow through resistor R47 and diode D17.

Edition 071024

-- 19 --1sM1725

AP1 -- Migmaster 173 / 203 component positions

clka1e05

Edition 071024

-- 20 --

1sM1725

WIRING DIAGRAM, Migmaster 253

Component description

WARNING !

STATIC ELECTRICITY can damage circuit

boards and electronic components.

S

SS

S Observe precautions for handling electrostatic

sensitive devices.

S

SS

S Use proper static--proof bags and boxes.

ESD

AP1 Circuit board

AP2 Digital instrument, accessory

C1, C2, CVS Capacitor 0,1uF/250V

EV1 Fan

KM1 Contactor 42V, 50--60Hz

L1 Inductor

L2, L3 Ferrite core

LF1 Lamp, white, On/Off

M1 Feed unit motor

QF1 Switch, ON/OFF

QF2 Switch, 12--step welding voltage selector

RO Resistor 15Ω/20W

RVS Resistor

RP1 Potentiometer, wire feed speed

RP2 Potentiometer with switch, spot welding

RI Shunt, accessory

RL Resistor

ST1 Thermal oveload cutout, operates at 130

o

C. The cutout is mounted at

the cooling fins of the diode bridge.

TC1 Control transformer

TC2 Transformer for CO2 heater, accessory

TC3 Transformer for digital instrument, accessory

TM1 Main transformer

V1 Diode bridge

VH LED yellow indication, thermal overload

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