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 -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ 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
