Which VFD is this? Danny
On 3/13/2016 8:52 PM, Gene Heskett wrote: > On Sunday 13 March 2016 13:39:10 Jon Elson wrote: > >> On 03/13/2016 08:47 AM, Gene Heskett wrote: >>> On Sunday 13 March 2016 09:30:30 John Thornton wrote: >>>> I just used the the one for by the drive. I "think" not all drives >>>> would use the same resistor. Just looking at the GS2 and there are >>>> 12 different braking resistors. >>> All of which are $435 a copy & still need some sort of an extra, >>> external controller. AD thinks we are growing our own money on a >>> tree in the back yard? >> MOST VFDs have the switch transistor built into the power >> block. (6 rectifiers and 7 IGBTs). >> So, those only need the resistor added. The purpose-built >> braking resistors usually have a thermal overload sensor so >> the drive shuts down if the resistor overheats. >> >> Jon >> > Well, I just took this one down as far as I could get it by taking out > screws abd unsnapping bits & peices w/o demolishing something, and there > aren't any terminals called P or B, anyplace. The only thing missing > seems to be a short, fat electrolytic labeled C4 in the art work. Every > other hole in the boards has something in it. So I guess I tie the > motor down with some clamps, and see how fast I can make it reverse from > its own panel. > > I note that the interface terminl board has separate fwd and reverse > outputs tallies. But in the instructions, about how to configure it, > both accel and decel times can be set as low as .01 seconds. > > Panel 15 while configuring it says its the startup braking voltage, can > be set from 1 to 100 volts. > > Panel 16 is startup braking time, ensuring that it starts from dead. > > Panel 17 is stop braking voltage, set 1 to 100 volts. > > Panel 18 is stop DC braking time, 0.00 to 650.00 seconds. > > Panel 19 selects the speed control input, choice of 5 different methods, > I'd use 3 for External 0-5 volt and feed it the PWM from the 5i25, which > I have been a ssured will work just fine. > > Skipping a bunch of stuff that it looks as if it might be used to > counteract any non-linearities in the speed obtain vs commanded, 7 > settings available there. > > Skipping ahead to Panel 29,30,31 which are labeled > 2nd accel time, 0.01 to 650 seconds > 2nd decel time, same range > 2nd decel stop frequency, .01 to 400 Hz, defining the output frequency > where it switches, Panel 8 & 9 settings are used above this frequency, > panel 29-30 used if below that frequency. > > On page 25 is a table of braking resistors, and that tables heading says: > > There are internal regenerat brake resistance in this series inverter > from .75kw to 30 kw. If extra brake torque is needed, please wire > proper brake resistance, which in the table for this size inverter, > 1.5kw, is a 100 ohm 250 watter. > > And thats all it has to say about braking resistors, but the device > hasn't any terminals labeled P or B to which it shows the optional > braking resistor is wired to. Seems I ought to feed it from the 5i25 > just for S & G ... But I have some more work to do on the mill before I > tear that circuitry out & reroute to this thing so I can play. > > Damn I hate it when the hardware and the docs aren't even in the same > country. > > Thanks, Jon, John & Danny, & anybony else that chimed in while I was > wrecking some mahogany by miss-reading the tape measure. > > Cheers, Gene Heskett ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785231&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
