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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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VFD braking
I want to add tapping ability (need to stop and reverse fast) to my CNC mill
with a VFD on the spindle. Its a 5 hp Hitachi SJ100. http://www.hitachi.us/supportingdocs...ok_NB585XF.pdf Pages 5-8 to 5-10 discuss adding a brake resistor. If I understand correctly I can put 2 resistors in parallel for more braking. This unit calls out a 35 ohm resistor. Two in parallel would be 17.5 ohms. Am I reading these tables right? I seen a 500 watt 16 ohm power resistor on eBay. Close enough or do you have to be right on? Karl |
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