BS/EN 60974-6-2016 pdf download.Arc welding equipment Part 6 : Limited duty equipment.
A welding power source is operated at rated supply voltage or rated load speed of rotation while the thermal control device Is disabled and the power source operated at the output condition of 7.2.1. During the test, the thermal protection shall operate before the maximum temperature limits are exceeded.
10 Abnormal operation
10.1 General requirements
A welding power source shall not suffer hazardous electrical breakdown or cause a risk of fire under the abnormal conditions of operation of 10.2 and 10.3. These tests are conducted without regard to temperature attained on any part, or the continued proper functioning of the welding power source. The only criterion is that the welding power source does not become unsafe. These tests may be conducted on other welding power sources.
Welding power sources, protected internally by, for example. a fuse, circuit-breaker or thermal protection, meet this requirement if the internal protection device operates before an unsafe condition occurs.
Conformity shall be checked by the following tests.
a) A layer of dry absorbent surgical type cotton is placed under the welding power source, extending beyond each side for a distance of 150 mm.
b) Starting from the cold state, the welding power source is operated in accordance with 10.2 and 10.3
c) During the test, the welding power source shall not emit flames, molten metal or other materials that ignite the cotton indicator.
d) Following the test and within 5 mm, the welding power source shall be capable of withstanding a dielectric test in accordance with 6.1.5 b) of IEC 60974-1:2012.
10.2 Stalled fan test
A welding power source, which relies on motor-driven fan(s) for conformity with the tests of
Clause 7, is operated at rated supply voltage or rated load speed of rotation for a period of
2 h while the fan motor(s) is(are) mechanically stalled and the power source operated at the
output condition of 7.2.1.
NOTE The intention of this test is to run the power source with tte fan stationary to check the safety of both fan
and power source
10.3 Short circuit test
See 9.3 of IEC 60974-1:2012.
Welding power sources shall be capable of operating at the rated supply voltage ±10 %. This may give deviations from the rated values.
Conformity shall be checked by operation.
11.1.2 Supply current
Supply current shall be measured by a true r.m.s. meter with a minimum crest factor of 3 and
calculation.
Conformity shall be checked by operation.
NOTE The measurement can be affected by the impedance of the supply circuit (see Annex 0 of
IEC 6O974-1:2O12)
11.1.3 Engine driven welding power source
In the case of engine powered rotating welding power source, the engine shall be capable of tolerating load variations between maximum load and no-load without adversely affecting the welding performance of the generator.
Conformity shall be checked by operation.
11.2 Multi supply voltage
Welding power sources which are designed to operate from different supply voltages shall be fitted with:
a) two supply cables, each fitted with a different plug, and a selector switch which ensures that the pins of the plug not in use cannot become live;
b) a system to automatically configure the welding power source in accordance with the supply voltage.
Conformity shall be checked by operation.
In the case a), a selector switch is additionally tested in accordance with 11.7.
11.3 Means of connection to the supply circuit
Acceptable means of connection to the supply Circuit are one of the following:
a) a flexible input supply cable attached to the welding power source;
b) appliance inlets titled to the welding power source and a flexible input supply cable.
11.8 Supply cables Supply cables shall:
a) be suitable for the application and meet national and local regulations;
b) be dimensioned in accordance with the maximum effective supply current li.,,; and
c) have a length of at least 2 m as measured from the exit point of the enclosure. Conformity shall be checked by visual inspection and measurement.
NOTE example or local regulahons are gven in B.b*ography. ag. HO 22.1 S4. lecItocal coae NEPA i .. STO. SJ, SJO. SiT. SJTO or other extra hard usage cable) or CSA C22. I PVC insulation has been proved not suitable for the application
11.9 Supply coupling device (attachment plug)
The current rating of a supply coupling device shall be not less than:
a) the current rating of the fuse required to comply with the short circuit test specified in
10.3;
b) the maximum effective supply current I,.
For 125 V input supply networks, the current rating shall, additionally, not be less than 70 % of the rated maximum supply current for equipment.
Conformity shall be checked by visual inspection, measurement and calculation.
12 Output
12.1 Rated no-load voltage
12.1.1 Rated no-load voltage for arc welding power source
The rated no-load voltage shall not exceed:
a) d.c. 113 V peak;
b) a.c. 68 V peak and 48 V r.m.s.
A welding power source that complies wth the reaucea no-load voitage iimiis witntn vU ms:
a) d.c.60V peak:
b) a.c. 50 V peak and 35 V r.m.s;
may be marked with symbol 84 of Annex L of IEC 60974-1:2012.BS/EN 60974-6-2016 pdf download.
BS/EN 60974-6-2016 pdf download
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