Iec 60974 6 2015

The thermal control device lmits the temp rature of its comp nents by red cin or dis on ectin the weldin c r ent, an is reset automatical y an is desig ed in ac ordan e con entional lo d

Arc welding equipment –

Part 6: Limit ed duty equipment

Mat ériel de soudage à l arc –

Part ie 6: Mat ériel à service l mit é

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Arc welding equipment –

Part 6: Limit ed duty equipment

Mat ériel de soudage à l arc –

Part ie 6: Mat ériel à service l mit é

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FOREWORD 6

1 Sco e 8

2 Normative referen es 8

3 Terms an def i ition 9

4 En ironmental con ition 10 5 Tests 10 5.1 Test con ition 10 5.2 Me s rin in truments 10 5.3 Conformity of comp nents 10 5.4 Typ tests 10 5 5 Routine tests 1

6 Protection again t electric s oc 1

6.1 In ulation 1

6.1.1 General 1

6.1 2 Cle ran es 1

6.1.3 Cre p ge distan es 1

6.1.4 In ulation resistan e 12

6.1.5 Dielectric stren th 12

6.2 Protection again t electric s oc in normal service (direct contact 12

6.2.1 Protection provided by the en los re 12

6.2.2 Ca acitors 12

6.2.3 Automatic dis harge of s p ly circ it ca acitors 13

6.3 Protection again t electric s oc in case of a fault con ition (in irect

contact 13

6.3.1 Protective provision 13

6.3.2 Isolation b twe n win in s of the s p ly circ it an the weldin circ it 13

6.3.3 Internal con u tors an con ection 13

6.3.4 Ad itional req irements f or plasma c tin s stems 13

6.3.5 Mova le coi s an cores 13

6.3.6 Tou h c r ent in f ault con ition 13

7 Thermal req irements 15

7.1 Devices for thermal protection an thermal control 15

7.2 He tin test 15

7.2.1 Test con ition 15

7.2.2 Toleran es of the test p rameters 15

7.2.3 Rated maximum weldin c r ent 15

7.2.4 Calc lation 16

7.3 Temp rature me s rement 16

7.3.1 Me s rement con ition 16

7.3.2 Sur ace temp rature sen or 16

7.3.3 Resistan e 16

7.3.4 Emb d ed temp rature sen or 16

7.3.5 Determination of the ambient air temp rature 16

7.3.6 Recordin of temp ratures 17

7.4 Limits of temp rature 17

7.4.2 External s rf aces 17

7.4.3 Other comp nents 17

7.5 L adin test 17

7.6 Commutators an sl p- in s 18

8 Thermal control device 18

8.1 Con tru tion 18

8.2 L cation 18

8.3 Op ration 18

8.4 Reset in 18

8.5 Op ratin ca acity 19

8.6 In ication 19

9 Thermal protection 19

9.1 Con tru tion 19

9.2 L cation 19

9.3 Op ration 19

10 Abnormal o eration 2

10.1 General req irements 2

10.2 Stal ed f an test 2

10.3 Short circ it test 2

1 Con ection to the input s p ly network 21

1 1 Input s p ly 21

1 1.1 Sup ly voltage 21

1 1.2 Sup ly c r ent 21

1 1.3 En ine driven weldin p wer source 21

1 2 Multi s p ly voltage 21

1 3 Me n of con ection to the s p ly circ it 21

1 4 Sup ly circ it terminals 21

1 5 Ca le an horage 2

1 6 Inlet o enin s 2

1 7 Sup ly circ it on/of switc in device 2

1 8 Sup ly ca les 2

1 9 Sup ly coupl n device (at ac ment plu ) 2

12 Output 2

12.1 Rated no-lo d voltage 2

12.1.1 Rated no-lo d voltage for arc weldin p wer source 2

12.1.2 Rated no-lo d voltage for plasma c tin p wer source 2

12.1.3 Ad itional req irements 2

12.1.4 Me s rin circ it 2

12.2 Typ test values of the con entional lo d voltage 2

12.2.1 Man al metal arc weldin with covered electrodes 2

12.2.2 Tu g ten inert gas arc weldin 2

12.2.3 Metal inertactive gas an flu cored arc weldin 2

12.2.4 Plasma c t in 2

12.2.5 Ad itional req irements 2

12.3 Mec anical switc in devices u ed to adju t output 2

12.4 Weldin circ it con ection 2

12.4.1 Protection again t u intentional contact 2

12.4.2 L cation of coupl n devices 2

12.4.3 Outlet o enin s 2

12.4.4 Markin 2

12.4.5 Con ection for plasma c t in torc es 2

12.5 Power s p ly to external devices 2

12.6 Au i ary p wer output 2

12.7 Weldin ca les 2

13 Control circ its 2

14 Hazard red cin device 2

15 Mec anical provision 2

15.1 General req irements 2

15.2 En los re 2

15.2.1 En los re materials 2

15.2.2 En los re stren th 2

15.3 Han l n me n 2

15.4 Dro with tan 2

15.5 Titin sta i ty 2

16 Au i aries 2

16.1 General 2

16.2 Wire f eeder 2

16.2.1 General 2

16.2.2 Test con ition 2

16.2.3 Thermal req irements 2

16.2.4 Protection again t u intentional contact 2

16.3 Torc 2

16.3.1 General 2

16.3.2 Test con ition 2

16.3.3 Thermal req irements 2

16.4 Electrode holder 2

16.5 Pres ure reg lator 2

17 Ratin plate 2

17.1 General req irements 2

17.2 Des ription 2

17.3 Contents 2

17.4 Toleran es 31

18 Adju tment of the output 3

19 In tru tion an markin s 3

19.1 In tru tion 3

19.1.1 General 3

19.1.2 In tru tion man al 3

19.1.3 Safety in tru tion 3

19.2 Markin s 3

An ex A (informative) Test pro es 3

An ex B (informative) Examples of atin plates 3

An ex C (informative) Symb ls-only precautionary la el 3

Biblogra h 3

Fig re 1 – Me s rement of tou h c r ent in fault con ition 14

Fig re 2 – Me s rin network f or weig ted tou h c r ent 14

Fig re 3 – Me s rement of r.m.s values 2

Fig re 4 – Me s rement of p ak values 2

Fig re 5 – Prin iple of the ratin plate 2

Fig re A.1 – Test pro e 12 of IEC 610 2 3

Fig re A.2 – Test pro e 13 of IEC 610 2 3

Fig re B.1 – Ratin plate 3

Fig re C.1 – Example of precautionary la el for en ine driven man al metal arc weldin p wer source 3

Ta le 1 – Temp rature l mits ac ordin to the clas of in ulation 17 Ta le 2 – Maximum temp rature l mits 2

Ta le 3 – Summary of rated no-lo d voltages 2

Ta le 4 – Hazard red cin device req irements f or plasma c t in p wer source 2

INTERNATIONAL ELECTROTECHNICAL COMMISSION

_

Part 6: Limited duty equipment

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th later

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p te t rig ts IEC s al n t b h ld re p n ible for id ntifyin a y or al s c p te t rig ts

International Stan ard IEC 6 9 4-6 has b en pre ared by IEC tec nical commit e 2 :

Electric weldin

This third edition can els an re laces the secon edition publ s ed in 2 10 It con titutes a

tec nical revision

The main sig if i ant tec nical c an es with resp ct to the previou edition are the f ol owin :

– modified me s rement con ition (se 7.3.1);

– improved values f or temp rature l mits ac ordin to the clas of in ulation (se Ta le 1);

– improved maximum temp rature l mits (se Ta le 2);

– deleted overlo d test

The text of this stan ard is b sed on the f ol owin doc ments:

Ful inf ormation on the votin f or the a proval of this stan ard can b fou d in the re ort on

votin in icated in the a ove ta le

This publ cation has b en drafted in ac ordan e with the ISO/IEC Directives, Part 2

This stan ard is to b u ed in conju ction with IEC 6 9 4-1:2 12

In this stan ard, the fol owin print typ s are u ed:

– c nformity stat eme ts: in itali type

A l st of al the p rts in the IEC 6 9 4 series, publ s ed u der the general title Arc wel d in

e ui pme t , can b fou d on the IEC we site

The commit e has decided that the contents of this publ cation wi remain u c anged u ti

the sta i ty date in icated on the IEC we site u der "htp:/we store.iec.c " in the data

related to the sp cific publ cation At this date, the publ cation wi b

• reconfirmed,

• with rawn,

• re laced by a revised edition, or

IMPORTANT – The “colour insid ” logo on the cov r pa e of this publ c tion

indic te that it contain colours whic are con idere to be u ef ul for the cor e t

understa din of its conte ts Us rs s ould theref ore print this publ c tion using a

colour printer

ARC WELDING EQUIPMENT –

Part 6: Limited duty equipment

This p rt of IEC 6 9 4 sp cifies safety an p rorman e req irements a pl ca le to l mited

d ty arc weldin an c tin p wer sources an au i aries desig ed f or u e by laymen

Electrical y p wered eq ipment is inten ed to b con ected to the sin le phase publ c l

ow-voltage s p ly s stem En ine driven p wer sources can ot ex e d output p wer of 7,5 kVA

NOT 1 This e uipme t is ty ic ly u e b n n-profe sio als in re id ntial are s

This p rt of IEC 6 9 4 is not a plca le to arc weldin and c tin p wer sources that req ire

an whic are inten ed f or in u trial an prof es ional u e only

This p rt of IEC 6 9 4 is not a pl ca le to arc weldin an c t in p wer sources an

an i ary eq ipment u ed in:

• mec anical y g ided a plcation ;

• s bmerged arc weldin proces ;

• plasma gou in proces ;

• plasma weldin proces ;

that are covered by other p rts of IEC 6 9 4

NOT 2 Power s urc s, wire fe d rs, torc e a d ele tro e h ld rs d sig e for in u trial a d profe sio al u e

are re p ctiv ly c v re b IEC 6 9 4- , IEC 6 9 4-5, IEC 6 9 4-7 a d IEC 6 9 4- 1

NOT 3 This p rt of IEC 6 9 4 d e n t s e if y ele troma n tic c mp tibi ty (EMC) re uireme ts th t are giv n

in IEC 6 9 4- 0

The fol owin doc ments, in whole or in p rt, are normatively referen ed in this doc ment an

are in isp n a le f or its a pl cation For dated ref eren es, only the edition cited a pl es For

u dated referen es, the latest edition of the ref eren ed doc ment (in lu in an

amen ments) a pl es

IEC 6 5 9, De re s of prot ect ion pro id ed b e cl osures (IP Cod e)

IEC 6 9 4-1:2 12, Arc weld ing e uipme t – P art 1: Wel d in p wer so rc s

IEC 6 9 4-5:2 13, Arc weld ing e uipme t – Part 5: Wire fe d ers

IEC 6 9 4-10, Arc wel d in e uipme t – P art 10: El ectroma n tic c mp t ibility (EMC)

re uireme ts

IEC 6 9 4-1 , Arc weld ing e uipme t – P art 1 : Ele trod e h ld ers

IEC 610 2:19 7, P rotection ofp rso s a d e uipme t b e cl osure – P ro es for v rific t io

ISO 2 0 , Gas weld ing e uipment – P res ure re ulat ors a d pres ure re ul at ors with f

low-meterin d evic s for g s c l i d ers used in wel d in , c tting a d al l ied pro es es u to 3 0 b r

electric c r ent p s in throu h a h man b d or throu h an animal b dy when it tou hes one

or more ac es ible p rts of an in tal ation or eq ipment

[SOURCE: IEC 6 0 0-19 :19 0/AMD 1:19 9, 19 -0 -21]

3.2

l mite duty weldin power sourc

p wer source inten ed for u e by a layman

3.3

la ma

o erator who do s not weld in the p r orman e of his prof es ion an has l t le or no formal

in tru tion in arc weldin

2

ma1

1ef

t

It

II

p riod of non-weldin o eration as imp sed by the thermal control device of the weldin

p wer source

3.7

rate welding time in 1 h



ONt

s mmation of the ON times (

ON) at the rated maximum weldin c r ent in a 6 min p riod

f ol owin the f irst OFF time (

OF)

OF)

4 Environme tal conditions

Weldin p wer sources an au i aries s al b ca a le of o eratin when the f olowin

en ironmental con ition prevai :

a) ran e of ambient air temp rature:

d rin o eration: –10 °C to + 0 °C;

b) relative h midity of the air:

up to 5 % at 4 °C;

up to 9 % at 2 °C;

c) ambient air, f re f rom a normal amou ts of d st, acid , cor osive gases or s bstan es

etc other than those generated by the weldin proces ;

d) altitu e a ove se level up to 1 0 0 m;

e) b se of the weldin p wer source in l ned up to 10°

Weldin p wer sources an au i aries s al with tan storage an tran p rt at an ambient air

temp rature of – 0 °C to + 5 °C without any damage to f un tion an p rf orman e

Weldin p wer source an au i aries s al b ca a le of del verin the rated contin ou

weldin time an the rated weldin time in 1 h at an ambient temp rature of 2 °C

The weldin p wer source s al b tested with an an i ary eq ipment f it ed that could af f ect

the test res lts

Al typ tests s al b car ied out on the same weldin p wer source ex e t where it is

sp cified that a test may b car ied out on another weldin p wer source

As a con ition of conformity the typ tests given b low s al b car ied out in the f ol owin

seq en e with no dryin time b twe n f ), g) an h):

a) general vis al in p ction, se 3.7 of IEC 6 9 4-1:2 12;

b) in ulation resistan e, se 6.1.4 (prel minary c ec );

c) en los re, se 15.2;

d) han l n me n , se 15.3;

e) dro with tan , se 15.4;

f ) protection provided by the en los re, se 6.2.1;

g) in ulation resistan e, se 6.1.4;

d) no-lo d voltage

1) rated no-lo d voltage, se 12.1; or

2) f or plasma c t in p wer source, rated red ced no-lo d voltage, se 13.2.1 of

IEC 6 9 4-1:2 12;

e) test to en ure rated minimum an maximum output values in ac ordan e with 15.4 b) an

15.4 c) of IEC 6 9 4-1:2 12 The man f acturer may select con entional lo d, s ort circ it

lo d or other test con ition

NOT In s ort circ it a d oth r te t c n itio , th o tp t v lu s c n diff er f rom c n e tio al lo d v lu s

Weldin p wer sources s al have a minimum degre of protection of IP21S u in IEC 6 5 9

test proced res an con ition

Remote controls f or weldin p wer sources s al have a minimum degre of protection of

IP2X u in IEC 6 5 9 test proced res an con ition

6.2.1.2 Prote tion a ainst ingre s of water

Adeq ate drainage s al b provided by the en los re Retained water s al not interf ere with

the cor ect o eration of the eq ipment or imp ir saf ety

Co formity sh ll b c e k d as fol lows:

A wel d in p wer so rc sh l l b su je ted t o th a pro riate water test witho t b in

e ergized Immed iately after t he t es th wel d ing power so rc sh l l b moved to a safe

e viro me t a d su je ted to the insul ati on resistan e a d d iel ectric stre gth tests

Ade u te draina e ofth e closure sh l b c e k ed b visu l insp ctio

6.2.1.3 Side a d to e clos re ope in s

The en los re s al b s c that a 5 mm lon test pin can ot b in erted f rom al sides

ex e t the u derside to tou h:

a) l ve p rts of the input circ it or

b) in the case of Clas I weldin p wer sources, an metal p rt whic is se arated f rom l ve

p rts of the input circ it by b sic in ulation

Conformity sh l l b c e k d with test pro e 12 of I EC 610 2:19 7 (se F ig re A.1)

6.2.3 Automatic dis harge of s pply circ it c pa itors

6.3.6 Tou h c r e t in fa lt condition

The weig ted tou h c r ent s al not ex e d 7 mA p ak in the case of external protective

con u tor fai ure or dis on ection

Co formity sh l l b c e k d usin the me suring circ it as sh wn in F ig re 1 a d Figure 2

u d er the fo owin c nd iti ons:

a) th wel d ing p wer so rc is:

– isol ated fom the gro nd pla e;

– su p ed b the hig est rat ed su ply voltag ;

– n t c n e ted t o th prot ect ive e rth ex ce t thro g me sureme t c mp n nts;

b) th output circ it is in the n -lo d c nd itio ;

c) interere c su pres ion c p citors sh l l n t b d isc n e ted

NOT Ca tio ! A q alf i d p rs n p rorms this te t Th prote tiv c n u tor is dis ble f or this te t

2U

7 Thermal requireme ts

7.1 De ic s f or th rmal prote tion a d thermal control

A weldin p wer source with l mited d ty s al b f ited with two in e en ent devices, one f or

thermal protection an one f or thermal control

The thermal control device lmits the temp rature of its comp nents by red cin or

dis on ectin the weldin c r ent, an is reset automatical y an is desig ed in ac ordan e

con entional lo d voltage given in 12.2, startin f rom the cold state

If it is k own that I

ma

do s not give the maximum he tin , then a worst case test s al

ad itional y b made at the set in within the rated ran e whic gives the maximum he tin

When placin the me s rin devices, the only ac es p rmit ed s al b throu h o ening

with cover plates, in p ction do rs or e si y remova le p nels provided by the man f acturer

The venti ation in the test are an the me s rin devices u ed s al not inter ere with the

normal venti ation of the weldin p wer source or cau e a normal tran f er of he t to or f rom

it

NOT 1 Th ma imum temp rature of c mp n nts c n b re c e at th n -lo d c n itio

NOT 2 Th rate ma imum weldin c re t te t a d th rele a t worst c s te t c n f olow e c oth r with ut

waitin for th weldin p wer s urc to return to th ambie t air temp rature

7.2.2 Tolera c s of the te t parameters

Durin the he tin test in ac ordan e with 7.2.3 the folowin toleran es s al b met:

a) lo d voltage:

510

−+

% of the a pro riate con entional lo d voltage;

b) weldin c r ent:

510

−+

% of the a pro riate con entional weldin c r ent;

c) s p ly voltage: ± % of the a pro riate rated s p ly voltage;

d) en ine sp ed:

510

−+

% of the a pro riate rated sp ed;

e) temp rature:

010

−+

K of the ambient temp rature

7.2.3 Rate ma imum welding c r e t

The test seq en e f or the rated maximum weldin c r ent I

ma

s al b as f olows:

a) en ure that the weldin p wer source is at thermal eq i brium with the ambient

temp rature of 2 °C, se toleran es in 7.2.2 e);

b) o erate the p wer source at the rated maximum weldin c r ent;

c) record ON time u ti first o eration of the thermal control device: rated contin ou weldin

time t

ON(max);

d) contin e the test immediately af ter the thermal control device resets, for a d ration of

6 min;

e) record ON time f or e c c cle

ONt

The test has f ai ed if

ONt

is les than 3 s or t

ON(max) is les than 6 s

7.2.4 Calc lation

The f ol owin rated value s al b calc lated:

• rated weldin time in 1 h

ONt

at the rated maximum weldin c r ent se 7.2.3 e);

where

ONt

7.3.1 Me s reme t con ition

The temp rature rise (K) s al b an average of the maximum an the minimum temp rature

that oc urs d rin

ONt

of the last c cle f or emb d ed an s race method or at the en of last

ON

t

f or resistan e method

The temp rature s al b determined as fol ows:

a) f or win in s, by me s rement of the resistan e, or by s r ace or emb d ed temp rature

sen ors;

b) f or other p rts, by s rf ace temp rature sen ors

Co formity sh l l b c e k d b me suring the t emp rat ure d urin the h at in t es Al

temp ratures sh l n t ex ce d th ma imum temp rat ure giv n in Ta le 6 of IEC 6 97

4-1:2 12

NOT 1 Th d sig of lmite d ty p wer s urc s is b s d o a th rmal c ntrol d vic th t o erate at th

ma imum alowe temp rature a d fin db th in ulatio cla s

NOT 2 Th s ra e temp rature s n or meth d is n t prefer e

NOT 3 In th c s of win in s of low re ista c h vin switc c nta ts in s rie with th m, th re ista c

me s reme t c n giv misle din re ults

7.3.2 Surfa e temperature s nsor

7.3.6 Re ording of temperature

Se 7.2.6 of IEC 6 9 4-1:2 12

7.4 Limits of temperature

7.4.1 Win ing , commutators a d sl p-rin s

The temp rature for win in s, commutators an slp- in s s al not ex e d the o eratin

temp ratures given in Ta le 1 f or the clas of in ulation

No p rt s al b al owed to re c an temp rature that wi damage another p rt even thou h

that p rt mig t conform to the req irements in Ta le 1

Table 1 – Temperature l mits a cording to the clas of ins lation

NOT 2 Normaly, th temp rature at th s ra e is th lowe t Th temp rature d termin d b re ista c

me s reme t giv s th a era e b twe n al temp rature o c rin in a win in Th hig e t temp rature

o c rin in th win in s (h t s ot) c n b me s re b emb d e temp rature s n ors

NOT 3 Oth r cla s s of in ulatio h vin hig er v lu s th n th s giv n in Ta le 1 are a aia le (s e

The maximum temp rature of other comp nents s al not ex e d their rated maximum

temp rature, in ac ordan e with the relevant stan ard

Startin f rom the cold state, the weldin p wer source is lo ded at the rated maximum

weldin c r ent u ti the thermal control device is actuated

Immediately af ter reset of the thermal control device, one of the fol owin tests is car ied out

a) In the case of a dro pin c aracteristic weldin p wer source, the controls are set to

provide rated maximum weldin c r ent It is then lo ded 6 times with a s ort circ it

havin an external resistan e b twe n 8 mΩ an 10 mΩ f or 2 s, fol owed by a p u e of

3 s

b) In the case of a flat c aracteristic weldin p wer source, it is lo ded on e with 1,5 times

the rated maximum weldin c r ent at maximum avai a le lo d voltage f or 15 s

7.6 Commutators a d sl p-rings

Commutators, sl p- in s an their bru hes s al s ow no eviden e of injuriou sp rkin or

damage throu hout the ran e of the en ine driven p wer source

Co formity sh l l b c e k d b visu l insp ction during

a) the h at ing test in a c rd an e wit h 7 2;

a d

b) th l oad ing test in a c rd an e wit h 7 5

8.1 Constru tion

The thermal control device s al b so con tru ted that it is not p s ible:

a) to c an e its temp rature set in , or

b) to alter its o eration without in ictin o viou ph sical damage

Co formity sh l l b c e k d b visu l insp ction

8.2 Loc tion

The thermal control device s al b p rmanently located within the weldin p wer source in

s c a way that the he t tran f er is rel a le

Co formity sh l l b c e k d b visu l insp ction

The thermal control device s al prevent the weldin p wer source win in s fom ex e din

the o eratin temp rature lmits as sp cified in Ta le 1 an without cau in an comp nent to

ex e d its rated temp rature within the ambient air temp rature ran e as given in

of 3 s

Co formity sh l l b c e k d b me sureme t of e c

ONt

d urin the h ating tes

8.5 Operating c pa ity

The thermal control device s al b ca a le of bre kin either the input c r ent or the weldin

c r ent 2 0 times con ec tively without faiure whi st the weldin p wer source del vers the

rated maximum weldin c r ent

Co formity sh l l b c e k d b prod ucing th re uired n mb r ofc nse utiv interu tions of

a circ it h ving the same ele tric l c ara terist ics, esp cia y c re t a d re ctan e, as the

circ it in whic t he th rmal c ntrol devic is used

Af ter this test, the req irements of 8.3 an 8.4 s al b met

8.6 In ic tion

Weldin p wer sources s al in icate that the thermal control device has red ced or

dis on ected the weldin p wer source output The in icator s al b either a yel ow l g t (or

yel ow f lag within an a erture), or an alphan meric display s owin s mb ls or word whose

me nin s are given in the in tru tion man al

Co formity sh l l b c e k d b visu l insp ction

9.1 Constru tion

The thermal protection s al b so con tru ted that it is not p s ible:

a) to c an e its temp rature set in , or

b) to alter its o eration without infl ctin o viou ph sical damage, or

c) to reset automatical y or man al y

Co formity sh l l b c e k d b visu l insp ction

9.2 Loc tion

The thermal protection s al b p rmanently located within the weldin p wer source in s c

a way that the he t tran f er is rel a le

Co formity sh l l b c e k d b visu l insp ction

The thermal protection s al not o erate d rin the he tin test

The thermal protection s al prevent the weldin p wer source fom ex e din the maximum

temp rature l mits as sp cified in Ta le 2

Table 2 – Ma imum temperature l mits

Temperature °C

Co formity sh l l b c e k d during t he h at in t est a d b t he fol lowing t est

A weldin p wer source is o erated at rated s p ly voltage or rated lo d sp ed of rotation

whi e the thermal control device is disa led an the p wer source o erated at the output

con ition of 7.2.1 Durin the test, the thermal protection s al o erate b f ore the maximum

temp rature l mits are ex e ded

10 Abnormal operation

10.1 Ge eral re uireme ts

A weldin p wer source s al not s ff er hazardou electrical bre k own or cau e a ris of fire

u der the a normal con ition of o eration of 10.2 an 10.3 These tests are con u ted

without regard to temp rature at ained on an p rt, or the contin ed pro er f un tionin of the

weldin p wer source The only criterion is that the weldin p wer source do s not b come

u safe These tests may b con u ted on other weldin p wer sources

Weldin p wer sources, protected internal y by, for example, a fu e, circ it-bre ker or thermal

protection, me t this req irement if the internal protection device o erates b fore an u saf e

con ition oc urs

Co formity sh l l b c e k d b th fol lowing tests

a) A layer of dry a sorb nt s rgical typ cot on is placed u der the weldin p wer source,

exten in b yon e c side f or a distan e of 15 mm

b) Startin f rom the cold state, the weldin p wer source is o erated in ac ordan e with 10.2

an 10.3

c) Durin the test, the weldin p wer source s al not emit f lames, molten metal or other

materials that ig ite the cot on in icator

d) Fol owin the test an within 5 min, the weldin p wer source s al b ca a le of

with tan in a dielectric test in ac ordan e with 6.1.5 b) of IEC 6 9 4-1:2 12

10.2 Stal e fa te t

A weldin p wer source, whic rel es on motor driven fan(s) for conf ormity with the tests of

Clau e 7, is o erated at rated s p ly voltage or rated lo d sp ed of rotation f or a p riod of

2 h whi e the fan motor(s) is(are) mec anical y staled an the p wer source o erated at the

11 Connection to the input supply network

1 1 Input s pply

1 1.1 Supply volta e

Weldin p wer sources s al b ca a le of o eratin at the rated s p ly voltage ±10 % This

may give deviation fom the rated values

1 1.3 En ine driv n welding p wer sourc

In the case of en ine p wered rotatin weldin p wer source, the en ine s al b ca a le of

toleratin lo d variation b twe n maximum lo d an no-lo d without ad ersely aff ectin the

weldin p rf orman e of the generator

Ac e ta le me n of con ection to the s p ly circ it are one of the f ol owin :

a) a flexible input s pply ca le atac ed to the weldin p wer source;

b) a pl an e inlets fited to the weldin p wer source an a flexible input s p ly ca le

Weldin p wer sources s al b fited with a s p ly circ it on/of switc in device The s p ly

circ it on/of f switc in device s al b in ac ordan e with 10.8 of IEC 6 9 4-1:2 12

1 8 Supply c ble

Sup ly ca les s al :

a) b s ita le f or the a pl cation an me t national an local reg lation ;

b) b dimen ioned in ac ordan e with the maximum eff ective s p ly c r ent I

1efan

c) have a len th of at le st 2 m as me s red fom the exit p int of the en los re

Co formity sh l l b c e k d b visu l insp ction a d me sureme t

NOT Ex mple or lo al re ulatio s are giv n in Biblo ra h , e.g H 2 1 S4, Ele tric l c d NFP 7 (SO, S ,

S O, SJ, SJO, SJT, SJTO or oth r e tra h rd u a e c ble) or CSA C2 1 P C in ulatio h s b e pro e n t

s ita le for th a plc tio

1 9 Supply coupl ng de ic (at a hme t plug)

The c r ent ratin of a s p ly coupl n device s al b not les than:

a) the c r ent ratin of the fu e req ired to comply with the s ort circ it test sp cif ied in

10.3;

b) the maximum ef fective s p ly c r ent I

1ef f

For 12 V input s p ly network , the c r ent ratin s al , ad itional y, not b les than 7 %

of the rated maximum s p ly c r ent f or eq ipment

Co formity sh l l b c e k d b visu l insp ction, me sureme t a d c lculation

12 Output

12.1 Rate no-loa volta e

12.1.1 Rate no-loa volta e for arc welding power sourc

The rated no-lo d voltage s al not ex e d:

A weldin p wer source that do s not comply with the red ced no-lo d voltage l mits within

2 0 ms, s al not b marked with s mb l 8 of An ex L of IEC 6 9 4-1:2 12 This weldin

p wer source s al b cle rly an in el bly marked on or ne r the f ront p nel or ne r the

ON/OFF switc in device with the s mb l IEC 6 417-6 4 that sig if ies “Caution! Ris of

electric s oc ”:

NOT If th arc weldin p wer s urc is f ite with a v lta e re u in d vic , ma ufa turer ta e into

c n id ratio lower a ditio al n -lo d lmit v lu a far a a plc ble f or th weldin pro e s

Co formity sh l l b c e k d b me sureme t in a c rd an e wit h 12.1.3

12.1.2 Rate no-loa volta e for pla ma c t ing p wer sourc

The rated no-lo d voltage s al not ex e d 35 V p ak d.c

Co formity sh ll b c e k d b me sureme t in a c rd an e wit h 12.1.3, b o eration a d b

visu l inspe tion, ex ce t th t t he series c mbin tion of the 2 0 Ω fixed a d 5 kΩ v riabl e

resist ors ma b re l ac d b a fix ed resista c of 5 kΩ

A rated no-lo d voltage ex e din 1 3 V p ak d.c may only b u ed if the f ol owin

req irements are f ulfi ed

a) The arc strikin seq en e s al only start when the plasma tip of the torc is in contact

with the workpiece, trig er is pul ed an c t in circ it imp dan e is lower than 2 0 Ω

b) These p wer sources with their cor esp n in torc es s al prevent the output of no-lo d

voltage if the torc is disas embled or dis on ected f rom the p wer source

c) The voltage b twe n the electrode of the torc an the workpiece s al b les than 6 V

p ak not later than 2 s af ter the control circ it is o ened (e.g trig er) or c tin circ it

imp dan e ex e d 2 0 Ω

d) The voltage b twe n the plasma tip of the torc an the workpiece s al not ex e d 6 V

p ak not later than 0,3 s af ter c tin circ it imp dan e ex e d 2 0 Ω

Co formity sh l l b c e k d b me sureme t b meter or osc l osc p in p rall el with 5 kΩ

minimum resistan e

12.1.3 Additional re uireme ts

The rated no-lo d voltage at al p s ible set in s s al not ex e d the values given in 12.1.1

to 12.1.2, s mmarized in Ta le 3

Table 3 – Summary of rate no-loa volta e

12.1.1 Arc weldin With ris of ele tric s o k s mb l

Weldin p wer sources, whic are electronical y controled, s al b

a) desig ed to en ure that the output voltages given in Ta le 3

can ot b ex e ded s ould an fault oc ur in an electronic circ it

or

b) f ited with a protection s stem, whic switc es of f the voltage at the output terminals

within 0,3 s an s al not b reset automatical y

If the no-lo d voltage is hig er than the values given in 12.1.1, the plasma c tin p wer

source s al b f ited with a hazard red cin device in ac ordan e with Clau e 14

A rectifier typ d.c weldin p wer source s al b so con tru ted that in case of a rectif ier

f ai ure (e.g o en circ it, s ort circ it or a phase f ai ure), the al owa le values can ot b

ex e ded

Conformity sh l l b c e k d b me sureme t a d b a alysis of the circ it a d /or b fa ure

simul ation

12.1.4 Me s ring circ it

For me s rin r.m.s values, a true r.m.s meter with a resistan e of the external weldin

circ it of 5 kΩ with a maximum toleran e of ± % as s own in Fig re 3 s al b u ed

Key

1 Dio e 1N4 0 or simiar

Figure 4 – Me s reme t of pe k value

The voltmeter s al in icate me n values The me s rement ran e c osen s al b as ne r

as p s ible to the actual value of the no-lo d voltage The voltmeter s al have an internal

resistan e of at le st 1 MΩ

The toleran e of the comp nent values in the me s rement circ it s al not ex e d ± %

For the typ test, the rhe stat is varied f rom 0 Ω to 5 kΩ in order to o tain the hig est p ak

value of the voltage me s red with these lo d of 2 0 Ω to 5,2 kΩ This me s rement is

re eated with the two con ection to the me s rin a p ratu reversed

The rhe stat resistan e an con ection that prod ces the hig est value of the voltage may b

determined d rin the typ test This resistan e an le d p larity may b u ed for the routine

test

12.2 Type te t v lue of th conv ntional loa volta e

12.2.1 Ma ual metal arc weldin with cov re ele trode

For plasma c t in u in air, the man facturer may sp cify the lo d voltage as determined

u der typical c tin con ition

12.2.5 Additional re uireme ts

Throu hout its ran e of adju tment, the weldin p wer sources s al b ca a le of s p lyin

con entional weldin c r ents (I

2) at con entional lo d voltages (U

2) in ac ordan e with

V

1 kΩ

Co formity sh l l b c e k d b suficient me sureme ts (se An e H of IEC 6 974-1:2 12).

12.3 Me ha ic l switc ing de ic s us d to a ju t output

Se 1 3 of IEC 6 9 4-1:2 12, but lmitin the test to 3 0 0 c cles

12.4 Welding circ it conn ctions

12.4.1 Prote tion a ainst uninte tional conta t

12.6 Auxi iary power output

Only, en ine driven p wer sources may b f it ed with au i ary p wer output

Hazard red cin devices are only a pl ca le to plasma c t in p wer source with a rated n

o-lo d voltage ex e din 1 3 V A hazard red cin device s al red ce the electric s oc

hazard that can originate f rom no-lo d voltages ex e din the alowa le rated no-lo d voltage

f or a given en ironment

Req irements f or maximum l mits are given in Ta le 4

Table 4 – Hazard re ucing de ic re uireme ts

A wire f eeder, either a stan -alone u it or bui t into the p wer source, s al comply with the

req irements of IEC 6 9 4-5:2 13 with the fol owin ex e tion :

– 16.2.2 re laces 5.1 of IEC 6 9 4-5:2 13;

– 16.2.3.re laces Clau e 9 of IEC 6 9 4-5:2 13

16.2.2 Te t con itions

16.2.3 Thermal re uireme ts

Thermal req irements s al b in ac ordan e with Clau e 7

16.2.4 Prote tion a ainst uninte tional conta t

A wire f eeder s al provide protection again t u intentional contact with p rts at the weldin

voltage Su h protection can b ac ieved by a hin ed cover or a protective g ard

Co formity sh l l b c e k d b visu l insp ction

Only a typ A electrode holder in ac ordan e with IEC 6 9 4-1 s al b del vered with the

weldin p wer source

It is p rmis ible to se arate the a ove section f rom e c other an af f ix them at location

more ac es ible or con enient f or the u er

NOT Ad itio al inf ormatio c n b giv n Furth r u eful inf ormatio , for e ample cla s of in ulatio , p lutio

d gre or p wer fa tor, c n b giv n in te h ic l lterature s p le b th ma ufa turer (s e Cla s 19)

Box 1 Name an ad res of the man f acturer or distributor or imp rter an ,

o tional y, a trade mark an the cou try of origin, if req ired

Box 2 Typ (identification) as given by the man f acturer

Box 3 Trace bi ty of desig an man f acturin data, f or example serial n mb r

Box 4 Weldin p wer source s mb l (o tional) for example

Sin le-phase tran f ormer

Sin le-phase tran f ormer rectifier

Sin le-phase static f eq en y con erter tran f ormer rectifier

In erter p wer source with a.c an d.c output

Sin le-phase combined a.c an d.c p wer source

En ine-a.c generator

En ine-generator rectifier

Box 5 Ref eren e to the stan ard con rmin that the weldin p wer source comples

with their req irements

b) Weldin output

Man al metal arc weldin with covered

Direct or alternatin c r ent at the same output, an

ad itional y the rated f req en y in Hertz

(IEC 6 417-5 3

(2 0 :10)

0 V Rated no-lo d voltage

a) p ak value in case of direct c r ent

b) r.m.s value in case of alternatin c r ent

Box 9 A/ V to

A/ V

Ran e of output, minimum weldin c r ent an its

cor esp n in con entional lo d voltage or les , maximum

weldin c r ent an its cor esp n in con entional lo d

voltage or gre ter

ma A Rated maximum weldin c r ent at 2 °C ambient temp rature

2 V Values of the con entional lo d voltage

(ma )

ONt

at

the rated maximum weldin c r ent at an ambient temp rature

of 2 °C, se 7.2.3 c), expres ed in min tes an secon s

Box 13

Rated maximum weldin time in intermit ent mode

ONt

at the

rated maximum weldin c r ent at an ambient temp rature of

2 °C d rin an u inter upted time of 6 min se 7.2.3 e),

Box 16

I

1ma A Rated maximum s p ly c r ent

Box 17

I

1ef A

Maximum ef f ective s p ly c r ent

Box 18 b) IP Degre of protection, f or example IP21S or IP2 S

(2 0 :0 )

17.4 Tolera c s

Man f acturers s al me t ratin plate values within the f ol owin toleran es by control n

comp nent an man f acturin toleran es:

0

rate no-lo d voltage in V ± 5 % me s red in ac ordan e with 12.1, but in no

case s al the values s mmarized in Ta le 3 b ex e ded;

maximum con entional lo d voltage in V;

The values of c) s al not b les than those stated on the ratin plate

rated maximum weldin time in contin ou mode ±10 %;

(

it

ON

rated maximum weldin time in intermit ent mode ±10 %

Co formity sh l l b c e k d b me surin u der c nvention l wel d ing c nd itions (se 3.17 of

b) precaution to b taken with wire f eeders, gas c l n ers an pres ure reg lator;

c) the me nin of in ication , markin s an gra hical s mb ls;

d) information on con ection to the s p ly network, fu e an /or c irc it -bre ker rat in ;

e) cor ect o erational u e relatin to the weldin p wer sources (f or example co l n

req irements, location, control device, in icators, f uel typ );

f ) weldin ca a i ty, l mitation an explanation of thermal control device;

g) l mitation of u e: weldin p wer sources are not s ita le for u e in rain or s ow;

h) how to maintain the weldin p wer source (f or example cle nin );

i) a l st of recommen ed sp re p rts an con uma les;

j) precaution again t to pl n over, if the weldin p wer source s al b placed on ti ted

plane;

k) typ (identification) of au i aries that are sp cified f or u e with the p wer source;

l) warnin again t the u e of a weldin p wer source f or pip thawin ;

m) pres ure, f low rate an typ of s ieldin gas;

n) ste s or ran e of the output c r ent an the cor esp n in gas as a set of values;

o) EMC clas if i ation in ac ordan e with IEC 6 9 4-10;

p) the output is rated at an ambient temp rature of 2 °C an the weldin time may b

red ced at hig er temp ratures

19.1.3 Saf ety instructions

The saf ety in tru tion s al in lu e the f olowin b sic g idel nes or eq ivalent regardin

protection again t p rsonal hazard f or p rson in the are

a) Ris of electric s oc : Electric s oc f om weldin electrode can ki Do not weld in the

rain or s ow We r dry in ulatin gloves Do not tou h electrode with b re han s Do not

we r wet or damaged gloves Protect yourself f rom electric s oc by in ulatin yourself

f rom workpiece Do not o en the eq ipment en los re

b) Ris in u ed by weldin f umes: Bre thin weldin f umes can b hazardou to your he lth

Ke p your he d out of the f umes Use eq ipment in an o en are Use venti atin f an to

remove fumes

c) Ris in u ed by weldin sp rk : Weldin sp rk can cau e explosion or f ire Ke p

f lamma les away fom weldin Do not weld ne r flamma les Weldin sp rk can cau e

f ires Have a fire extin uis er ne rby an have a watc p rson re d to u e it Do not weld

on drums or any closed containers

d) Ris in u ed by the arc: Arc ray can burn eyes an injure s in We r hat an safety

glas es Use e r protection an but on s irt col ar Use weldin helmet with cor ect s ade

of f ilter We r complete b dy protection

e) Ris in u ed by electromag etic field : Weldin c r ent prod ces electromag etic field

Do not u e with medical implants Never coi weldin ca les arou d your b d Route the

weldin ca les together

The safety in tru tion f or en ine driven p wer sources s al also in lu e:

f ) Ris in u ed by ex au t fumes: En ine ex au t gases can ki Never u e in ide home,

garage or other en losed sp ces, even if do rs an win ows are o en Only u e outside

f ar away f orm win ows, do rs an vents

19.2 Markings

Eac weldin p wer source s al b cle rly, visibly an in elbly marked with the f ol owin

combination of s mb ls or eq ivalent:

Caution! Re d in tru tion man al

Electric s oc f rom weldin electrode can ki

Bre thin weldin f umes can b hazardou to your he lth

Weldin sp rk can cau e explosion or fire

Arc ray can burn eyes an injure s in

Electromag etic f ield can cau e p cemaker malf un tion

Eac en ine driven weldin p wer source s al also b cle rly, visibly an in el bly marked

with the fol owin combination of s mb ls or eq ivalent:

En ine ex au t gases can ki

Eac weldin p wer source s al b cle rly, visibly an in elbly marked with precautionary

la els that contain the saf ety in tru tion Precautionary la els may con ist of text only, text

an s mb ls, or s mb ls only Where s mb ls-only precautionary la els are u ed, it is

recommen ed that these la els fol ow ISO 17 4 An example of s mb ls-only precautionary

la el is given in An ex C

Co formity sh l b c e k d b visu l insp ct ion a d b testin in a c rd an e wit h the

dura i lity t est in 17.1

Annex B

(inf ormative)

Examples of rating plates

A cle rly an in elbly marked ratin plate s al b fixed sec rely an to or printed on e c

weldin p wer source Se Fig re B.1

Annex C

(inf or mative)

Symbols-only precautionary label

Precautionary la els s al inf orm the u er on p s ible hazard , se Fig re C.1

Fig re C.1 – Example of pre a tionary label f or e gine driv n

0

IE C

Bibl ogr aphy

IEC 6 0 0 (al p rts), I ntern tio al El ectrot ec nic l Vo a ulary (IEC) (avaia le at

www.electro edia.org)

IEC 6 0 5, E le tric l nsulatio – Th rmal e al uat ion a d d esign tion

IEC 6 12 -1, Miniature fuses – P art 1: Definitio s for miniat ure fuses a d g n ral

re uireme ts for miniat ure fuse-li ks

IEC 6 2 9-1, L w-v l tag fuses – P art 1: Ge eral re uireme ts

IEC 6 417, Gra hic l symb ls for use o e uipme t (avai a le f rom: htp:/ www.gra hical

-sy mb ls.inf o/eq ipment

IEC 6 9 4 (al p rts), Arc weld ing e uipme t

IEC 615 8-1:2 0 , Safety of p wer tra sformers, p wer su p es, re ctors a d simil ar

prod ucts – Part 1: Ge eral re uireme ts a d t ests

ISO 7 0 , Gra hic l symb ls for use o e uipme t – Ind ex a d sy o sis

ISO 17 4 , Weld ing a d all ied pro es es – He l th a d safety – Word les pre a t io ary

l ab ls for e uipme t a d c nsuma l es used in arc weld ing a d c tt ing

CSA C2 1, Ca ad ian electric l c d e

HD 2 1 S4:2 0 , Ca l es of rated v lt ag s u to a d in l ud ing 450/7 50 V a d h vin

cros linked i nsul ation – Part 1: Ge eral re uireme ts

NFPA 7 , N at ion l E l ectric l c d e

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