servo drive compatability

[JFettig]

Current to supply these:
I ordered a set of 400W Motors which the nameplate currrent is 8.7A. If Im going to run 3 of these motors, do I need 3*8.7amps available at all times or only about 10 amps total?
I know that its similar to the 10 amps total with brushed servos, but no idea how this is going to work out.

Thanks,
Jon

[Stevie]

I would think you'll need enough for all axis to move at once; otherwise you'll run out of power

[rutexus]

Gentlemen,

I'll try to address a few issues at one time.

First, the question of rpm's with the surplus center motors. The calculations done above appear to me to be right. 1350 rpm with the step multiplier.

The mention of the Gecko /Mach4 combination is interesting, but can you buy one today? It has been in the works for the last few years. The spi mode of the new Rutex 2000 series drives also allows for very fast motion. I remember Vladimir saying 80 million steps per second theoretically. The DLL for the spi is still un-documented, but the spi is already in use with the Rutex tuning program. I hope the documentation becomes available this fall. The drives we are shipping already have the spi functionality built in. As I said, it is already used by the Rutex tuning software. Once the DLL is documented, you can access it too. The mother boards also are already configured for it as well.

DRO question?

Once the spi is documented for general use (we have two users programming with it I believe right now) the exact position of the motor is accessible at any moment in time through the spi. There is no way to read them through the Rutex drives presently in the step and direction mode. You could tap into the encoder signal wires of course but that is not the same as reading a decoder.

Thats all for now.

Tom Eldredge
Rutex LLC

[rutexus]

Jeffitig,

You should be fine with the 10 amps as you figured it.

Tom

[ger21]

The mention of the Gecko /Mach4 combination is interesting, but can you buy one today? It has been in the works for the last few years.

You can buy the hardware right now, and Art should have a software beta in a month or two. He's working almost full time on it. I've got a feeling that Mach4 will be ready (beta at least) before the documentation you're talking about. And who wants to write their own software? But don't worry, we'll all be buying your drives.

[chrisw765]

hi well i know steppers very well and have converted and built a few small cnc mills and routers,im know looking to convert a old vmc i bought to mach3 the old servos are trash. ive seen the 1000w sanyo servos on ebay for 99 bucks i believe there big enof for a 20x30 vmc but hears the problem im trying to forge ahead in trying to learn about servos,so fare theirs a/c d/c brush and brushless... also servo amps and servo drives,are all servo drives compatible with all servos i.e. of coarse keeping brushless and non brusless separated and what input due they need mach 3 is step and dir output what is plc and why is the motor rated at 100v ac but in post there feeding it 24v dc?? pls point me in the right direction and thank you for your time i want to jump on the 1000w sanyos but want to make sure i don't have to buy some special 2k$ sanyo driver that wont even take a step and dir input???

thx Chris also if it easier to call my number is 702-303-6006 or i can call u??

[miljnor]

Hi chris. maybe you should reread the post and then ask your questions again. most of what you ask has been answered here already and here is another thread

Great Deal, Now Need Driver

[chrisw765]

i read that whole post i did get most of what i needed but still 2 questions is the voltage ac or dc that there driving it with every one keeps posting there going to built power supply's in the 70v range but ac or dc??? has anyone actually driven a p5 yet?? and if so any slow speed cogging i make small parts so this could be a problem for me,i see most amps use pwm for control but mach is step and dir is there a converter or a good driver say under 250.each that can drive the p5 and take step and dir input?? thx Chris

[ger21]

Read post #27. Rutex drives are $198. With the Rutex drive, I believe you supply DC voltage. Other drives may require AC.

[damae]

Actually I will need to use the brake on my mill; the spindle and the drive/stepper etc will need to be held up if power is lost

I just read the brake specs -- it seems a little underrated for the motor, but not by much. The motor ratings are:

Rated Torque 28.2 in-lb
Continuous Stall Torque 34.7 in-lb
Peak Torque at Stall 104.1 in-lb

And the brake is rated at a holding torque of 26.03 in-lb.

So it seems that the brake is underrated. Of course, I don't have any experience with industrial uses of a holding brake, but my Emerson servos have brakes rated at about 2x the peak motor torque.

It seems the brake is sized perfectly to hold a load when the power is off, but not for active braking in an emergency situation. What do you guys think?

[drk]

Has somebody from the zone been able to run these motors with the rutex drives yet, any special considerations for encoder connections????

PLease let us know if things have started working.

Regards

[ger21]

I just read the brake specs -- it seems a little underrated for the motor, but not by much. The motor ratings are:

Rated Torque 28.2 in-lb
Continuous Stall Torque 34.7 in-lb
Peak Torque at Stall 104.1 in-lb

And the brake is rated at a holding torque of 26.03 in-lb.

So it seems that the brake is underrated. Of course, I don't have any experience with industrial uses of a holding brake, but my Emerson servos have brakes rated at about 2x the peak motor torque.

It seems the brake is sized perfectly to hold a load when the power is off, but not for active braking in an emergency situation. What do you guys think?

You should be cutting power to the motors when the brake is applied, so I would think it should be fine.