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07-09-2013 #1
The braking resistor (referred to in the drawing in this advert - HIGH QUALITY NEW 2HP 1.5KW 7A 220-250V VARIABLE FREQUENCY DRIVE INVERTER VFD T2 | eBay ) ....presumably this slows the spindle quicker when the spindle is stopped - is the resistor needed (in other words does the spindle take forever to stop without it)....is it as simple as a large wattage resistor...and what's the spec typically used for the braking resistor? (on the toshiba it said "braking module available separately" ....which suggests it'll cost a pretty penny!)
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07-09-2013 #2
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07-09-2013 #3
However its a good idea to program ramp time of 6 sec in the Vfd and 10 sec dwell time in Mach3
Last edited by Boyan Silyavski; 07-09-2013 at 01:04 PM.
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07-09-2013 #4
for what it's worth, this seems to be the spindle I have...
800W High Speed CNC Spindle Motor, View spindle motor, JST Product Details from Changzhou Jiesite Electrical Co., Ltd. on Alibaba.com
(the model is jgd-65c-800 - it has 400Hz stamped on the case)Last edited by HankMcSpank; 07-09-2013 at 01:31 PM.
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07-09-2013 #5
The braking resistor is mostly for when a motor is connected to a load, for example imagine a motor connected to a 10ton flywheel and somebody hits the emergency stop button. There's a lot of energy to get rid of in a short space of time and it's the resistor that dissipates this energy, obviously a spindle in our application does not have a load connected.
Also re. ramp times, in the ABB I use on my pin router I have the normal ramp time set to something over 5 seconds (can't quite remember) but I can set another ramp for emergency stop situations and this is set lower and for this I use a braking resistor (because I already had one) which allows it to stop very quickly but in reality it's not doing a lot. Also the resistor is there to prevent damage to the drive, depending on how much protection is built into it the DC link voltage can rise and cause damage.
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