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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Soft starter question
I have a milling machine that's starting to show its age. It has a 5 Hp,
208V, 3 Ph spindle motor that's currently on a full voltage Fwd/Rev starter. Motor really slams when turned on and has damaged the variable speed sheaves and keyways. Was thinking of adding a soft start system in series with the original starter. Considered a VFD but have heard that using one with a motor not designed for such makes problems. Even adding a line reactor to remove harmonic content may be required. All told, a soft starter appears to be the best choice. Does anybody have a favorite unit to recommend? Ones I've seen so far have a SCR in series with two of the three legs and control starting voltage and ramp-up time. If you keep them powered, they can also control ramp-down time. A contactor bypasses the reduced voltage system after the ramp time. All fine and well but only some of the vendors seem to rate # of starts per hour. I would assume that this is due to heat generation when the SCRs are carrying the load and the need to dissipate it. Thanks in advance for any answers Oppie |
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