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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Posted to sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
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Replacing (or eliminating) antique MOVs?
Stud-mount diodes (four in a bridge configuration) are protected by MOVs: one
across the AC connections, one across the DC connections. These MOVs are antique-looking finned affairs (a la selenium rectifiers). Both sport PN S01AAA?AAA (?=illegible) with Westinghouse trademark. The wiring diagram symbol for these looks like a zener diode with an extra arrow head (both arrow points touch, with the familiar "z" shaped line between them). The AC supply voltage to the bridge is 75 rms. The bridge diodes are originally 100V/1A devices; I'm replacing with 400V/35A ones. This rectifier drives a DC motor via 2 contactors: one for direction (by reversing polarity) and the other for "GO/STOP". The MOVs are to limit the kick from opening contacts, I presume. Someone suggested that with such stout diodes available today that maybe the MOVs are not required. If you think I need to keep the MOVs, how do I select new ones? What say y'all? Thanks, -- DaveC This is an invalid return address Please reply in the news group |
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