Panasonic YD-500KR Operating Instructions Manual

Also see for YD-500KR: Operating instructions

33PERIODIC INSPECTIONRemoval of the Top Plate and Side Plate.Cautions for Dielectric Strength Test and Insulation Resistance Test Since this machine usesmany semiconductors, including thyristors, an imprudent dielectric strength test or insulationresistance measurement could lead to a trouble of the equipment.When you conduct these tests in compliance with your company regulations, he sure to observethe following points.1 Remove three cables coming from the switch box and connected to three input terminals. Tiethe three input terminals altogether with a conductor to Short-circuit them.2 Tie three input terminals of the magnet switch altogether with a conductor to short-circuitthem. Also, tie three input terminals of the magnet switch altogether with a conductor toshort-circuit them.3 Remove two output cables connected to two output terminals. Tie the two output terminalswith a conductor to short-circuit them.4 Using conductors, tie between the anode and cathode of the thyristors (SCR1-SCR6) toshort-circuit them. The conductors used in ①,② and ③ should have a sectional area ofabout 1.25 mm2.5 Remove the case grounding terminal (wire number 9). The 500KR2 has the case grounded, usinga fasten terminal on the magnet mounting plate for the primary side, and another fastenterminal on the rack frame(bottom plate) for the secondary side.)6 Remove everything such as wire feeder, etc. and leave the welding power unit as a singleunit.7 Remove all connectors from the printed circuit board.Now that you have completed those preparations, you can proceed with the above-mentioned testswithout worrying about troubles or damages on the equipment.①Remove of the top plate. (4 bolts)②Remove the side plates.(9 bolts each on the left and right)Tips