[maquiza]

Hello,

Can Viper 200 drive a Fanuc 20M Brush DC servo Drive? the specs. are
23Nm TRQ, 18 Amp, 40 amp. Peak, 213V 1500RPM . I want to retrofit a Mazak HMC with Mach3.

Thanks,

Jorge

[Larken]

That voltage is a bit high (215) but It can run at 180 volts. I'm currently doing testing on some with IGBT's.

[maquiza]

Larken,

How would the servo motor work with 180 volts? The top RPM would be 80%of what it did as new? Will this affects the Torque?

Thanks,

Jorge

[routerman]

It doesn't affect torque (very little) because the drive only gives the voltage to the motor it needs. At low speeds the drive may give the motor only a low voltage.

Yes, the motor will only run 80% of its top speed.

[maquiza]

What are the specs. for the encoder that works best with the Viper?
If I am planning on use it with this Fanucs servo motors.

Thanks,


Jorge.

[Larken]

What are the specs. for the encoder that works best with the Viper? If I am planning on use it with this Fanucs servo motors.

I've used up to 4000 line (8000 cnt) encoders. Depends on your motor gearing which encoder res you need.

[DennisCNC]

Doesn't 4,000 line = 16,000 count in quadrature

[Al_The_Man]

A basic line/rev count of 4000 line IS in quadrature, but can be increased by 2x or 4x quadrature.
Al.

[Larken]

Doesn't 4,000 line = 16,000 count in quadrature

Ya, my mistake.

I'd like to be able to connect to a Resolver. Anyone know how?

[DennisCNC]

^^you want to go brushless soon?

Looking at this page resolvers don't look to impressive next to encoders?:
http://www.auto-met.com/heidenhain/t...a/LINEAR-2.HTM

[Larken]

No, brushless uses too many wires. A few years ago i bought some Teknic servo drives (worldservo.com) . They are a nice drive, but way too much work to connect them up. Thats when i decided to develop my own.

I plan on working on an AC servo though by next year.