alphonso
Titanium
- Joined
- Feb 15, 2006
- Location
- Republic of Texas
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Selenium rectifier
Tom
Selenium rectifier
Tom
ok, so lets now put your argument in this particular context - how many of those characteristics useful in 1000A plating rectifier are relevant for a simple dc electromagnet? (I'm still assuming this is a dc injection motor brake application)
Tell us more about this machine.
Almost certainly selenium, the number of junctions suggests that. Selenium has much higher reverse voltage withstand capability than copper oxide, the other popular choice. It appears to be a full-wave rectifier, easily replaced with a solid state (silicon) type at low cost.
Characteristics? Well, they ended up being higher resistance than silicon or germanium, but that was not always an advantage. If the resistance was used in the circuit, an added resistor will generally do the trick when using a silicon replacement.
Mostly they were used because they were functional, low cost, and easily available up into the 1960s, when solid state (so called) became dominant and cheaper.
You do not HAVE TO replace it, they work fine when not defective, and used within their ratings, same as any other component.
Lot bigger lathe than I thought!
A 250VA transformer seems small to be powering a spindle brake, in addition to all the other contactor coils. But there may be other transformers in the machine - 120V is coming into this one and maybe 220 ( lowest terminal, partly obscured) from a 440V main.
Or, if you're just interested in making the spindle brake work, tracing the wires back from the brake to its control and checking for voltage/amperage would be a start.
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