What dc voltage to use on rutex R90H drive

[InsaneEPP]

Ooops, sorry. Yes, it is the PC4 or PC5, not PC45. Depending on what pin output you want. If you call US Digital, they can hook you up with the right stuff. I have E5 encoders and I needed their EA-D8 for the same reason, but that is another story.

[Bob fran]

USdigital took them back without restocking cost. I ordered the E5D encoders, this time its differential output and acccording to Rutex, length of encoder wire could be any length desired and not picky on the kind of wire.

[ynneb]

Hey Bob, Just outa interest, how much did the encoders cost you?

[Bob fran]

Cost of encoder is $52 and a 10 ft cable with corresponding plug is $24.

[tctech]

I am retro fitting a large heavy duty lathe (14') with R90H drives, using Mach3 to drive them ...

The Z-axis motor is rated 215VDC 35A continuous and the X-axis motor 200VDC 29A continuous. Has anyone used the R90H/R2020 with motors as large as these? I am supplying 180VDC to both the drives.

Has anyone worked with motors as large as these? I'd like to know how you tackled the job...

The Z-axis of my machine is working OK ...I am now working on getting the X-axis working OK.

This lathe also has a 8-station tool turret for which I have written a Mach3 macro that drives a proprietory microcontroller-based card to control the tool turret. I would like to contact anyone who has worked with driving tool turrets too ...

[rutexus]

TC Tech,

Those are some pretty large motors. The R90H drives should be able to drive them at the lower voltage if you are able to make adequate provision for the "braking".

We have a motor and drive matching document on the Rutex.com web site under the R2000 products. It generally applies to the R90H as well. Your motor must have a minimum of .015 ohms resistance for each volt applied to the motor. In other words, for a 180 vdc VM, your motor must provide a minimum of 2.7 ohms. I'm sure these big motors do not. In fact, I'll bet that their armature resistance is less than or close to .3 ohms. Therefore, you should put a 2.5 ohm resistor in series with your motor. Note also that the wattage of the resistor will need to be very high...around 2000 watts if your motor . These types of resistors may be available through manufacturers of VFD drives. They use them for braking also, but the ones I am familiar with are rated a little higher than 2.5 ohms resistance, (25 ohms) so I'm not sure where to tell you to get such a large resistor.

Please read the above referenced document to get an understanding of how this configuration will be expected to perform, what losses to expect, etc.

Tom Eldredge
Rutex LLC