Test En 60974-4 - ESAB Heliarc 283i Service Manual

SERVICE INSTRUCTIONS

Test EN 60974-4

1. Remove the cover of the power source.
2. Disconnect the fast sleeve connector attached to the central baffle panel on the power
source.
3. Run the test EN 60974-4.
4. Attach the fast sleeve connector to the central baffle panel on the power source.
NOTE!
If the service technician cannot do the above mentioned set up, the insulation
resistance test may be replaced by the tests of the primary and circuit
leakage current in accordance with section 5.4 and 5.5 of the test EN
60974-4.
Welding circuit leakage current
The leakage current between the welding outlets and the protective conductor terminal shall
not exceed 10 mA a.c. RMS.
Conformity shall be checked by measurement of the leakage current with a circuit as shown
below at the rated supply voltage and no-load condition.
The measuring circuit shall have a total resistance of 1750 ohm ± 250 ohm and shall be
shunted by a capacitor so that the time constant of the circuit will be 225 µs ±15. In the case
of 1 750 ohm, the capacitor will be 130 nF.
NOTE!
For all class II equipment, use the PE-terminal of earthed supply circuit network.
Primary leakage current
The primary leakage current in the external protective conductor shall not exceed:
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