Snap-On TIG 250 AC-DC, Руководство по обслуживанию

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CEBORA S.p.A.
21
− A1-K2(+) - K1(-) = 0.5 Vdc; A1-K2(-) - K1(+) = >Mohm;
− A2(+) - A1-K2(-) = 0.5 Vdc; A2(-) - A1-K2(+) = >Mohm;
− A3(+) - K3(-) = 0.5 Vdc; A3(-) - K3(+) = >Mohm.
If incorrect replace the defective diodes or the entire diode module (19).
♦
With AC/DC selector switch (30) in the “0” position, make sure voltage on the terminals of
the secondary power circuit of transformer (46) = approximately 60 Vac, with rated mains
voltage. If incorrect check the connections of the primary and secondary windings of the
transformer (46) power circuit, considering that each one is made up of two semi-windings
arranged on the two columns of the magnetic core. Perform the tests in par. 3.3.1. if
necessary.
♦
Check for voltage at the secondary circuit of the power transformer (46), measuring between
terminal “A” of the thyristor group (47) and terminal “C8” of the AC/DC selector switch (30).
Correct values = approximately 61 Vac, with power source powered. If incorrect, perform the
tests in par. 3.3.1.
3.302.221 15/01/07