Weco Discovery 221AC/DC-VRD Evo User manual

Cod. 006.0001.2000
08/03/2022 V.2.2
Discovery 221AC/DC Evo
221AC/DC-VRD Evo
Discovery 300AC/DC Evo
300AC/DC-VRD Evo
Instruction manual
ENG
Translation of original instructions

Cod. 006.0001.2000
08/03/2022 V.2.2 Discovery 221AC/DC Evo/VRD Evo
Discovery 300AC/DC Evo/VRD Evo
2
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Discovery 300AC/DC Evo/VRD Evo
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INDEX
1 INTRODUCTION.......................................................................................................................................... 4
1.1 INTRODUCTION.......................................................................................................................................... 5
2 INSTALLATION .......................................................................................................................................... 6
2.1 CONNECTIONS TO THE ELECTRICAL MAINS NETWORK...................................................................... 6
2.2 FRONT PANEL............................................................................................................................................. 6
2.3 REAR PANEL............................................................................................................................................... 7
2.4 PREPARING FOR MMA WELDING............................................................................................................. 8
2.5 PREPARING FOR TIG WELDING............................................................................................................... 9
3 USER INTERFACE .................................................................................................................................... 10
4 UNIT POWER-UP ...................................................................................................................................... 12
5 RESET (LOAD FACTORY SETTINGS)..................................................................................................... 12
6 SET UP (INITIAL SET-UP OF THE WELDING POWER SOURCE) ......................................................... 14
7 ALARM MANAGEMENT ........................................................................................................................... 18
8 MMA WELDING ........................................................................................................................................ 20
8.1 MMA WELDING - FIRST LEVEL MENU .................................................................................................... 20
8.2 MMA WELDING -SECOND LEVEL MENU ................................................................................................ 22
8.3 MMA WELDING - SPECIAL FUNCTIONS ................................................................................................. 24
9 TIG WELDING ........................................................................................................................................... 25
9.1 TIG WELDING - FIRST LEVEL MENU ...................................................................................................... 25
9.2 TIG WELDING - SECOND LEVEL MENU ................................................................................................. 30
9.3 TIG DC WELDING - SPECIAL FUNCTIONS MENU ................................................................................. 34
9.4 TIG AC WELDING - SPECIAL FUNCTIONS MENU.................................................................................. 39
10 TORCH TRIGGER PROCEDURE ............................................................................................................. 44
10.1 2 STROKE SPOT - Q-SPOT FUNCTION .................................................................................................. 51
11 JOBS MANAGEMENT .............................................................................................................................. 57
11.1 SAVING A JOB...........................................................................................................................................57
11.2 DELETING A JOB ...................................................................................................................................... 58
11.3 LOADING A JOB ........................................................................................................................................ 59
11.4 EXPORTING/IMPORTING JOBs (through a USB memory stick).............................................................. 60
11.5 SELECTING JOBS USING THE TORCH BUTTONS ................................................................................ 62
12 TECHNICAL DATA .................................................................................................................................... 63
12.1 DISCOVERY 221AC/DC EVO ................................................................................................................... 64
12.2 DISCOVERY 300AC/DC EVO ................................................................................................................... 65
13 ELECTRICAL DIAGRAM .......................................................................................................................... 66
13.1 DISCOVERY 221AC/DC EVO ................................................................................................................... 66
13.2 DISCOVERY 300AC/DC EVO ................................................................................................................... 67
13.3 TORCH CONNECTOR (front panel) .......................................................................................................... 68
13.4 REMOTE CONTROL CONNECTOR (back panel).....................................................................................68
14 SPARE PARTS .......................................................................................................................................... 69
14.1 DISCOVERY 221AC/DC EVO ................................................................................................................... 69
14.2 DISCOVERY 300AC/DC EVO ................................................................................................................... 71

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1 INTRODUCTION
IMPORTANT!
This handbook must be consigned to the user prior to installation and commissioning of the unit.
Read the "General prescriptions for use" handbook supplied separately from this handbook before
installing and commissioning the unit.
The meaning of the symbols in this manual and the associated precautionary information are given in
the "General prescriptions for use”.
If the "General prescriptions for use" are not present, it is mandatory to request a replacement copy
from the manufacturer or from your dealer.
Retain these documents for future consultation.
LEGEND
DANGER!
This pictogram warns of danger of death or serious injury.
WARNING!
This pictogram warns of a risk of injury or damage to property.
CAUTION!
This pictogram warns of a potentially hazardous situation.
INFORMATION
This pictogram gives important information concerning the execution of the relevant operations.
 Thissymbolidentiesanactionthatoccursautomaticallyasaresultofapreviousaction.
 Thissymbolidentiesadditionalinformationorareferencetoadifferentsectionofthemanual
containing the associated information.
§ Thissymbolidentiesareferencetoachapterofthemanual.
*1 The symbol refers to the associated numbered note.
NOTES
Theguresinthismanualarepurelyguidelineandtheimagesmaycontaindifferenceswithrespectto
theactualequipmenttowhichtheyrefer.

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1.1 INTRODUCTION
Discovery221AC/DCEvo/VRDEvoisanadvancedtechnologysingle-phaseweldingpowersourcefor
ACandDCTIGweldingoperations.
Discovery300AC/DCEvo/VRDEvoisanadvancedtechnologythree-phaseweldingpowersourcefor
ACandDCTIGweldingoperations.
ACTIGfunctionsareidealforaluminium,magnesiumandrelatedalloyswelding.
Mildsteel,stainlesssteelandcoppercanbeeasilyweldedinDCTIG.
ACTIGweldingisoptimizedthanksto:
Synergic arc strike can be selected by the user interface according to tungsten electrode diameter.
ExtrafusionfunctionmaximizesarcfocusingforconsiderablethinmaterialinACTIGwelding.
Mixed AC/DC increases arc penetration for thick aluminium plates.
PulsedACTIGmodewhichpreventstheriskofdeformationoftheworkpieceinthecaseofprolonged
weldingoperations.
Upto4,00mmdiameterelectrodeweldingispossibleinMMA.
Thefanisturnedononlyduringwelding,attheendoftheweldingprocessitremainsonforaxed
periodoftimeaccordingtoweldingconditions.
Thefanisnonethelesscontrolledbyspecicthermalsensorsthatguaranteeacorrectcoolingofthe
machine.
Accessories/ancillary devices that can be connected to the unit:
- manualremotecontrolforremoteadjustmentoftheweldingcurrent.
- foot-pedalremotecontrolforTIGtorcharcstrikingandremoteadjustmentofweldingcurrent.
- UP/DOWNtorchortorchwithpotentiometer.
- liquid cooler for TIG torches.
Consultyourdealerforanupdatedlistofaccessoriesandthelatestnewproductsavailable.

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2 INSTALLATION
DANGER!
Lifting and positioning
Read the warnings highlighted by the following symbols in the “General prescriptions for use”.
2.1 CONNECTIONS TO THE ELECTRICAL MAINS NETWORK
Themainspowersupplyfeaturestowhichtheequipmentshouldbeconnectedaregiveninchapter“12
TECHNICAL DATA” at page 63.
Themachinecanbeconnectedtomotorgeneratorsprovidedtheirvoltageisstabilised.
Connect/disconnectthevariousdeviceswiththemachineswitchedoff.
2.2 FRONT PANEL
1234
○ Negativepoleweldingsocket.[Item1].
○ Connectorforgasfeedhose:gasowfromthepowersourcetothetorch.[Item2].
○ TIGTORCHcontrolconnector[Item3].
○ Positivepoleweldingsocket.[Item4].

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2.3 REAR PANEL
1 2 4
5
○ Remotecontrolconnector[Item1].
○ Connectorforgasfeedhose:gasowfromthecylindertothepowersource[Item2].
○ Coolingunitpowerfeedingconnector[Item3].
• Voltage:230Va.c.
• Currentoutput:1.35A
• IPprotectionrating:IP20(capopen)/IP66(capclosed)
DANGER!
High voltage!
If the socket is not connected to any devices always close the cap
○ WeldingpowersourceON/OFFswitch[Item4].
○ Powercable.[Item5].
• Length(outerside):2,05m
• Numberandcrosssectionofwires:3x2.5mm2(on221AC/DCEvo/VRDEvo)/4x2.5mm2
(on300AC/DCEvo/VRDEvo)
• Powerplugtype:Schuko250Va.c./16A(on221AC/DCEvo/VRDEvo)/notsupplied(on
300AC/DCEvo/VRDEvo)
3

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2.4 PREPARING FOR MMA WELDING
1. SettheweldingpowersourceON/OFFswitchto“O”(unitswitchedoff).
2. Plugthepowercableplugintoamainssocketoutlet.
3. Choosetheelectrodebasedonthetypeofmaterialandthicknessoftheworkpiecetobewelded.
4. Insert the electrode in the electrode holder.
5. Connecttheelectrodeholdercabletotheweldingsocketbasedonthepolarityrequestedbythe
type of electrode used.
6. Connecttheplugofthegroundclamptotheweldingsocketonthebasisofthepolarityrequired.
7. Connecttheearthclamptotheworkpiecebeingprocessed.
DANGER!
Electric shock hazard!
Read the warnings highlighted by the following symbols in the “General prescriptions for use”.
8. SettheweldingpowersourceON/OFFswitchto“I”(unitpowered).
9. Selectthefollowingweldingmodeontheuserinterface:MMA
10.Settherequiredweldingparametervaluesontheuserinterface.
Whentheremotecontroller[RC]isconnectedandtherelativelockingscrewistightened,welding
current can be adjusted using the remote controller.
Thesystemisreadytostartwelding.
REAR VIEW FRONT VIEW
(polarity to basic electrode)
REMOTE
CONTROL

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2.5 PREPARING FOR TIG WELDING
NOTE: For the cooler to power source assembly procedure refer to the cooler instruction
manual.
1. SettheweldingpowersourceON/OFFswitchto“O”(unitde-energized).
2. Plugthepowercableplugintoamainssocketoutlet.
3. Connectthegashosefromtheweldinggascylindertothereargassocket.
4. Openthecylindergasvalve.
5. Choosetheelectrodebasedonthetypeofmaterialandthicknessoftheworkpiecetobewelded.
6. Insert the electrode in the TIG torch.
7. Connectthetorchplugtotheweldingsocketonthebasisofthepolarityrequiredbythetypeof
electrode in question.
8. Connecttheplugofthegroundclamptotheweldingsocketonthebasisofthepolarityrequired.
9. Connectthegashosefromtheweldingtorchtothefrontgassocket.
10.ConnecttheweldingtorchconnectortotheTIGtorchsignalsconnector.
11.Connecttheearthclamptotheworkpiecebeingprocessed.
12.SettheweldingpowersourceON/OFFswitchto“I”(unitpowered).
13.Selectthefollowingweldingmodeontheuserinterface:DCTIG
14.Pressthetorchtriggerwiththetorchwellclearofanymetalparts.Thisservestoopenthegas
solenoidvalvewithoutstrikingtheweldingarc.
15.Usetheowcontrolvalvetoadjusttheowofgasasrequiredwhilethegasisowingout.
16.Settherequiredweldingparametervaluesontheuserinterface.
Whentheremotecontrolpedalisconnectedandtherelativelockingscrewistightenedtheweld-
ingcurrentwillvaryinrelationtothepressureexertedonthepedal.
Thesystemisreadytostartwelding.
REAR VIEW FRONT VIEW
(polarity for tungsten electrode)
REMOTE
CONTROL

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3 USER INTERFACE
Discovery 221AC/DC Evo/VRD Evo - Discovery 300AC/DC Evo/VRD Evo
MenuMenu
Q-SPOT
ACAC
DYN arc
QST
M-TACK
MIX ac/dcMIX ac/dc
HF
SYN
HzHz
E1/S5
S3
L2
D1
USB S4S2S1
L1
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
CODE SYMBOL DESCRIPTION
L1
QST
DCTIGmode:illuminationshowsthatthefollowingparametercanbeset:Q-START
MIX ac/dcMIX ac/dc
ACTIGmode:illuminationshowsthatthefollowingparametercanbeset:MIXAC/DC
L2
DYN arc
DCTIGmode:illuminationshowsthatthefollowingparametercanbeset:DYNAMICARC
ACTIGmode:illuminationshowsthatthefollowingparametercanbeset:EXTRAFUSION
L3
M-TACK
DCTIGmode:illuminationshowsthatthefollowingparametercanbeset:MULTITACK
HzHz
ACTIGmode:illuminationshowsthatthefollowingparametercanbeset:ACFREQUENCY
(Hz)
L4
ACTIG mode/ DCTIGmode: illuminationshowsthatthefollowing parametercan beset:
ELECTRODE DIAMETER (mm)
ACTIGmode:ThisLEDasheswhenthesetweldingcurrentistoohighinrelationtothecho-
sen electrode diameter.
L5 ACTIGmode:illuminationshowsthatthefollowingparametercanbeset:ACTIGBALANCE
L6
HF
Illuminationshowsthatthefollowingfunctionhasbeenactivated:HIGHFREQUENCYARC
STRIKE (HF)
L7 Illuminationshowsthatthefollowingfunctionhasbeenactivated:2strokeprocedure.
L8 Illuminationshowsthatthefollowingfunctionhasbeenactivated:4strokeprocedure.
L9 Illuminationshowsthatthefollowingfunctionhasbeenactivated:4strokeB-levelprocedure
L10
Q-SPOT
Illuminationshowsthatthefollowingfunctionhasbeenactivated:2strokespotprocedure(Q-
SPOT).
L11 ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:MMA

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CODE SYMBOL DESCRIPTION
L12 ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:CONTINUOUSDC
TIG
L13
ACAC
ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:CONTINUOUSAC
TIG
L14
SYN
ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:SYNERGICPULSED
DC TIG
Whenthisison,itmeansthatthesynergicmodeisactiveandthattheoperatorcansetjustthe
weldingcurrentwhiletheotherparametersareautomaticallyregulatedbythemachine.The
synergyisoptimisedforanglewelding.
L15 ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:PULSEDDCTIG
L16
ACAC
ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:PULSEDACTIG
S1
DCTIGmode:PressthebuttontoselecttheDCTIGspecialfunctions.
Possiblechoices:Q-START-DYNAMICARC-MULTITACK-ELECTRODEDIAMETER
ACTIGmode:PressthebuttontoselectACTIGspecialfunctions.
Possiblechoices:MIXAC-EXTRAFUSION-ACFREQUENCY–ACBALANCE-ELECTRO-
DE DIAMETER
S2 Press the button to access the JOB MENU.
S3 ACTIGmode/DCTIGmode:Thisbuttonselectsthetorchtriggerprocedure.
S4 Thisbuttonselectstheweldingmode.
E1/S5
MenuMenu
-Keepthebuttonpressedwhilepoweringonthepowersource:thebuttonopenstheSET-UP
menu.
-Pressandrelease:thebuttonselectstherstlevelmenuparameters.
-Holddownfor3seconds:thebuttonopensthesecondlevelmenu.Wheninthemenu,press
and release the button to select the parameters.
-Datasetting:Theencodersetsthevalueoftheselectedparameter.
-Duringtheweldingoperations:Theencodersetsthevalueofthefollowingparameter:WEL-
DING CURRENT
USB PortprovidedtoconnectaUSBmemorysticktoexport/importJOBs.
D1
IDatasetting:Thedisplayshowstheparametertobeset,itsvalueandthegraphicsymbol
associated to it.
Welding:Thedisplayshowstheeffectiveamperesvalueduringwelding.

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4 UNIT POWER-UP
SettheweldingpowersourceON/OFFswitchto“I”toswitchontheunit.
Themessageappearsonthefollowingdisplay:D1.
FX.X=softwareversion
300AC/DC
EVO
F.X.X
300AC/DC-VRD
EVO
F.X.X
Firstpower-uporpower-upsfollowingaRESETprocedure
Theweldingpowersourcesetsupforweldingwiththefactorypre-sets.
Subsequentpower-ups
Theweldingpowersourcesetsupforweldinginthelateststableweldingcongurationthatwasactive
atthetimeofpower-off.
5 RESET (LOAD FACTORY SETTINGS)
MenuMenu
Q-SPOT
ACAC
DYN arc
QST
M-TACK
MIX ac/dcMIX ac/dc
HF
SYN
HzHz
E1/S5
S3
L2
D1
USB S4S2S1
L1
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
SET-UP (14/15)
-----------------------------------------------------
MAX CORR.UP OFF
COUNTERS *****
RESET PAR
C
B
A
OUTPUT
ACTIVATION
SELECTION
Theresetprocedureinvolvescompleterestorationofthedefaultvalues,parametersandmemoryset-
tings set in the factory.
Theresetprocedureisusefulinthefollowingcases:
- Toomanychangesmadetotheweldingparameterssouserndsitdifculttorestoredefaults.
- Unidentiedsoftwareproblemsthatpreventtheweldingpowersourcefromfunctioningcorrectly.

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PARTIAL RESET
Theresetprocedureinvolvesrestorationoftheparametervaluesandsettings,exceptthefollowing
settings:
- Settings of the SETUP menu.
- SavedJOBS.
TOTAL RESET
Theresetprocedureinvolvescompleterestorationofthedefaultvalues,parametersandmemoryset-
tings set in the factory.
Allmemorylocationswillberesetandhenceallyourpersonalweldingsettingswillbelost!
A
○ SettheweldingpowersourceON/OFFswitchto“O”toswitchtheunitoff.
○Holding the S5 button
MenuMenu
down,turnthepowersourceswitchto“I”tostarttheunit[
SIMULTANEOUS ACTIONS ].
○Display D1showstheSET-UP MENU.
B
○ Selectwithencoder E1
MenuMenu
thefollowingsetting: RESET.
○Press the S5 button
MenuMenu
.
○ Selectwithencoder E1
MenuMenu
thefollowingsetting: PAR (partial) o TOT (total).
○Press the S5 button
MenuMenu
.Amessagerequestingtoconrmisdisplayed.
C
○Exit with conrmation
- Press the S5 button
MenuMenu
.
- Wait for the memory clear procedure to terminate.
- Press the S1 button to exit the SET-UP menu.
○Exit without conrmation
- Press the S1 button .
- Press the S1 button to exit the SET-UP menu.

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6 SET UP (INITIAL SET-UP OF THE WELDING POWER SOURCE)
MenuMenu
Q-SPOT
ACAC
DYN arc
QST
M-TACK
MIX ac/dcMIX ac/dc
HF
SYN
HzHz
E1/S5
S3
L2
D1
USB S4S2S1
L1
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
A
C
B
SET-UP (1/15)
-----------------------------------------------------
LANGUAGE ENG
COOLING TYPE AUT
STARTING CURRENT %
ACTIVATION
OUTPUT
A
○ SettheweldingpowersourceON/OFFswitchto“O”toswitchtheunitoff.
○Holding the S5 button
MenuMenu
down,turnthepowersourceswitchto“I”tostarttheunit[
SIMULTANEOUS ACTIONS ].
○ DisplayD1showstheMENU SET-UP.
B
○ Selectwithencoder E1
MenuMenu
the setting to be edited.
○Press the S5 button
MenuMenu
toconrm.
○Using the E1
MenuMenu
,editthevalueoftheselectedsetting.Thevalueissavedautomatically.
○Press the S5 button
MenuMenu
. It returns to the list of settings..
C
○Exit with conrmation
- Press the S1 button .
Tab. 1 - Setup settings
SETTING MIN DEFAULT MAX NOTES
LANGUAGE EN ENGLISH
ITALIANO
FRANÇAIS
DEUTSCH
ESPAÑOL
PORTUGUES
DUTCH
CESKY
SRBSKI
POLSKI
SUOMI
COOLING TYPE ON AUT OFF
STARTING CURRENT % % A
FINAL CURRENT % % A
SELECTION

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HF CURRENT 20 A SYN 200 A
HF TIME 0.5 s 2.0 s 3.0 s
PULSED TYPE SLOW FAST FAST
PILOT ARC OFF ON ON
ENABLE READ I. OFF ON ON
TORCH TYPE 1 1 2
PEDAL TYPE 2 2 9
MAX CURR. UP
COUNTERS
RESET PAR TOT TOT
SERVICE VAL VAL CAL
ER ACTIVATION GROUP
○ ON=Thecoolerisalwaysrunningwhenthepowersourceisswitchedon.Thismodeispreferable
forheavydutyandautomaticweldingprocedures.
○ OFF=Thecoolerisalwaysdisabledbecauseanair-cooledtorchisinuse.
○ AUT=Whentheunitisswitchedonthecoolerisswitchedonfor15s.Duringweldingprocedures
thecoolerrunsconstantly.Whenweldingisterminatedthecoolercontinuestorunfor90s+a
numberofsecondsequivalenttotheaveragecurrentvalueshownusingtheHOLDfunction.
Torch loading
WARNING!
Make sure the torch in use is correctly sized in relation to the welding current required and for
the available and selected cooling type. This prevents the risk of burns to which the operator is
potentially exposed, potential faults, and irreversible damage to the torch and the system.
If a torch is installed or replaced while the unit is running, the circuit of the newly installed torch
must be lled with coolant to avoid the risk of damage to the torch in the case of high voltage arc
strikes without any liquid in the circuit.
Power-up with operation of the cooler set to "ON" or "AUT" mode
○A check is performed automatically of the presence of liquid in the cooling circuit and the cooler
isswitchedonfor15seconds.
○ Ifthecoolantcircuitisfull,thepowersourcesetsupinthemostrecentstableweldingcongura-
tion.
○ Ifthecoolantcircuitisnotfull,allfunctionsareinhibitedandtherewillbenooutputpowerpresent.
UNIT ALARM!:Themessagewillappearondisplay D1
Press the (generic) button to repeat the checking procedure for an additional 15 seconds.
If the problem persists, rectify the cause of the alarm.
Power-up with operation of the cooler set to "OFF"
Operation of the cooler and the cooler alarm are disabled.
Weldingisperformedwithoutliquidcoolingofthetorch.
Torch change-over with operation of the cooler set to "ON"
Press and release the torch trigger.
Thisservestostartthecoolerfor15secondstollthetorchcoolingcircuit.

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- STARTING CURRENT
○ Thevalueofthisparametercanbesetasapercentageoftheweldingcurrentorasanabsolute
valueexpressedinAmperes.
- FINAL CURRENT
○ Thevalueofthisparametercanbesetasapercentageoftheweldingcurrentorasanabsolute
valueexpressedinAmperes.
- HF CURRENT
○ ThisparameterestablishesthecurrentvalueduringHFdischarge.Thevalueofthisparameter
canbesetasanabsolutevalueorinSYN.
○ WithSYNsettingtheHFcurrentvalueiscalculatedautomaticallyonthebasisofthepre-setweld-
ingcurrentvalue.
Consequences of a higher value:
• Arcstrikingisfacilitated,evenonverydirtyworkpieces.
• Riskofpiercingexcessivelythingaugeworkpieces.
- HF TIME
○ Thisparameterdenesthemaximumhighfrequency(HF)arcstrikeduration.
- PULSED TYPE
○SLOW =Thissettingenablesslowpulsedmode.Thepeaktimeandbasetimeareset.
○FAST= This setting enables fast pulsed mode. The frequency and duty-cycle are set.
- PILOT ARC
○ Thefunctionenablestheoutputofalowcurrentbetweenthe1stand2ndtimesofthetorchtrig-
gertoshieldthemaskinadvanceandavoidtheriskofblindingashbackcausedbythewelding
current.
- ENABLE READ CURRENT
○ Thisfunctionallowsfortherealweldingcurrentdisplaytobeenabledordisabled.
- TORCH TYPE
The parameter changes the torch trigger operating mode.
• oFF:indicatesstandardoperation.
• 1:speciesthe4TB-levelmanagementvariant.Allowsthetransitiontothesecondarywelding
currentbypressingandholdingdowntheUPorDOWNbutton;whenthebuttonisreleased,
theprimarycurrentisrestored.WithvariantoFFselected,theUP/DOWNbuttonsaredisabled
for all procedures.
• 2:speciesthedownslopemanagementvariant.Byreleasingthetorchtriggerduringthethird
stroke(3S)thedownslopeisstoppedandthenalcurrentisimmediatelydeliveredwithout
havingtogothroughtheentireslopetime.TheHFrestartduringthedownslopeisdisabled.
- PEDAL TYPE
○ Theparameterselectsthetypeofpedalused:
• RC02 standard pedal type
• RC09 special pedal type. This type of pedal recognises the pressure applied to the foot pedal
orthetorchbutton,switchingautomaticallyfrominternaladjustmenttoexternalcontrolusing
the pedal.

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- MAX CURR. UP
WhentheparameterissettoON,themaximumvalueoftheweldingcurrentthatcanbesetwiththeUP
/DOWNtorchisthecurrentsetbytheencoderinthefrontpaneloftheweldingpowersource.Whenthe
parameterissettoOFF,themaximumvalueoftheweldingcurrentthatcanbesetwiththeUP/DOWN
torchisthemaximumcurrentthatcanbesuppliedbytheweldingpowersource.
- OPERATING HOUR COUNTER
○ Themenupageshowstheprocessinghourcounters.
• POWERON=Totalnumberofhourswhilethemachinehasbeenon(mainspowered).
• T.ARCON=Totalnumberofhourswithweldingarcon.
• P.ARCON=Partialnumberofhourswithweldingarcon.KeeptheS5buttonpressedfor3
seconds to reset the partial P.ARC ON.
SET UP
POWER ON 7.2 h The reading is carried out as follows: 7 hours and (0.2x60)
12 minutes
T. ARC. ON 5.3 h
P. ARC ON 0.7 h
- RESET
○ Theresetprocedureinvolvescompleterestorationofthedefaultvalues,parametersandmemory
settings set in the factory.
○ Theresetprocedureisusefulinthefollowingcases:
• Toomanychangesmadetotheweldingparameterssouserndsitdifculttorestoredefaults.
• Unidentiedsoftwareproblemsthatpreventtheweldingpowersourcefromfunctioningcorrectly.
PARTIAL RESET
○ Theresetprocedureinvolvesrestorationoftheparametervaluesandsettings,exceptthefol-
lowingsettings:
• Settings of the SETUP menu.
• SavedJOBS
TOTAL RESET
• Theresetprocedureinvolvescompleterestorationofthedefaultvalues,parametersandme-
mory settings set in the factory.
• Allmemorylocationswillberesetandhenceallyourpersonalweldingsettingswillbelost!
-SERVICE
○ hissettingenablesthemachinevalidation(VAL.)andcalibration(CAL)operations.
VALIDATION
○ Thevalidationprocedureallowstheweldingcurrentvalue(Ampere)andvoltagevalue(Volt)to
becorrectlydetectedanddisplayedontheequipmentdisplay.Thevalidationprocedurerequires
the equipment to be connected to a suitable static load.
CALIBRATION
○ hecalibrationprocedureallowsthemachinecurrenttobecalibrated.
The SERVICE procedure is not described in this manual as it can be carried out only by specialised,
suitably trained and equipped technical staff.
Thetestingmethodsandtheequipmentrequiredaresetoutintherelevanttechnicalstandards.

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7 ALARM MANAGEMENT
S T OP
Thissymbolisshownifanincorrectoperatingconditionoccurs.
Analarmmessageappearsonthefollowingdisplay:D1.
Tab. 2 - Alarm messages
MESSAGE MEANING EVENT CHECKS
E33
TERMIC
ALARM
Overheating alarm
Indicates tripping of the welding
powersourcethermalprotection.
Leavetheunitrunningsothatthe
overheated components cool as
rapidly as possible.
When the unit has cooled, the
welding power source will reset
automatically.
All functions disabled.
Exceptions:
• Cooling fan.
• Cooler(ifswitchedon).
• Make sure that the power re-
quiredbytheweldingprocessis
lower than the maximum rated
poweroutput.
• Check that the operating con-
ditions are in compliance with
thewelding powersourcedata
platespecications.
• Check for the presence of ade-
quate air circulation around the
weldingpowersource.
Phase missing alarm
Indicates the absence of a phase
inthepowersupplyline.
The message appears at the
same time as the mains protection
activationLEDswitcheson.
All functions disabled.
Exceptions:
• Cooling fan.
• Check if the equipment power
supply line has all the phases.
Iftheproblempersists:
• qualied technical personnel
are required for repair/mainte-
nance jobs.
E50
COOLING
ALARM
Cooler alarm
Indicates insufcient pressure in
the torch liquid cooling circuit.
All functions disabled.
Exceptions:
• Cooling fan.
The alarm message persists on
thedisplayuntiltherstoperation
is performed on the user interface.
Signalling of the alarm depends
onthefollowingsettings:
• Coo=on:thealarmissignalled
if the cooling unit is connected
tothepowersourceandifitis
running.
• Coo=oFF:thealarmisnever
signalled,irrespectiveofthecir-
cumstances.
• Coo=Aut:thealarmissignalled
if the cooling unit is connected
tothepowersourceandifitis
running.
• Check that the connection to
the cooler is correct.
• Check that the "O/I" switch is
set to "I" and that it illuminates
whenthepumpisrunning.
• Check that the cooler is lled
withcoolant.
• Check that the cooling circuit
is liquid tight, notably the torch
hoses, the fuse and the internal
connections of the cooler.
E04
ALARM
VOUT
Alarm, no-load voltage failure
All functions disabled.
Exceptions:
• Cooling fan.
• Check to ensure the welding
torchisnotrestingonthework-
piece connected to ground.
• Check that when the power
source is switched on there
is no short circuit between the
sockets(voltagemustbegreat-
erthan/equivalenttoUr).
Iftheproblempersists:
• Qualied technical personnel
are required for repair/mainte-
nance jobs.

Cod. 006.0001.2000
08/03/2022 V.2.2
Discovery 221AC/DC Evo/VRD Evo
Discovery 300AC/DC Evo/VRD Evo
19
ENGLISH
MESSAGE MEANING EVENT CHECKS
E05
TORCH
ALARM
Torch button alarm
Indicates that when the power
source was powered up a short
circuit was detected on the torch
trigger input.
When the unit has cooled, the
welding power source will reset
automatically.
All functions disabled.
Exceptions:
• Cooling fan.
• Make sure the torch trigger is
not pressed, jammed, or short
circuiting.
• Make sure the torch and torch
connector are intact.
E65
INDUCTAN-
CE ALARM
It indicated and excessive induc-
tanceintheweldingcircuit.
Toresettheweldingpressauser
interface key.
All functions are disabled.
Exceptions:
Cooling fan.
Coolingunit(ifswitchedon).
.
• Check that the welding cables
arenotexcessivelylongand/or
woundup.
• Make sure that the set AC fre-
quencyisnotexcessivelyhigh.
• If the workpiece to be welded
features inductive characteri-
stics(windings,etc.),movethe
earth clamp as to minimise as
much as possible the distance
betweentheclampandthewel-
ding arc.

Cod. 006.0001.2000
08/03/2022 V.2.2 Discovery 221AC/DC Evo/VRD Evo
Discovery 300AC/DC Evo/VRD Evo
20
ENGLISH
8 MMA WELDING
8.1 MMA WELDING - FIRST LEVEL MENU
MenuMenu
Q-SPOT
ACAC
DYN arc
QST
M-TACK
MIX ac/dcMIX ac/dc
HF
SYN
HzHz
E1/S5
S3
L2
D1
USB S4S2S1
L1
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
C
A
B
SELECTION
ACTIVATION
A
○Press the S4 button toactivatetheMMAmode.
MenuMenu
Q-SPOT
ACAC
DYN arc
QST
M-TACK
MIX ac/dcMIX ac/dc
HF
SYN
HzHz
E1/S5
S3
L2
D1
USB
S4
S2S1
L1
L3
L4
L5
L6
L7
L8
L9
L10
L11
L12
L13
L14
L15
L16
A
L 11 MMA
B○Press the S5 button
MenuMenu
to scroll the list of settings to edit.
- ThesettingtoeditanditsvalueareshowninthedisplayD1.
C○Using the encoder E1
MenuMenu
,editthevalueoftheselectedsetting.Thevalueissavedautomati-
cally.
SETTING