Re: [CAD_CAM_EDM_DRO] Toshiba DC Brushless Servos

Brad Eyben wrote:

>Hello all,
>I have acquired a manual for my Toshiba servo drives and have determined the following;
>
>They require a Speed reference signal -10V to +10v analog signal which determines full speed CW to full speed CCW
> Start command signal to enable them, aprox. 1 second after the main DC power, of 24VDC - 5mA
>
>They output a dual quadrature pulse train 1024PPR A/A, B/B, and Z -1-PPR says, The pulse receiving circuit in the controller should use a RS422 differential line receiver, SN75173 (Texas Instruments) or AM26LS32C (TI or Advanced Micro Devices). The clock speed should be faster than 3 Mhz. The signal output voltage levels are 0 and 5 Vdc (nominal).
>They also have a fault output transistor rated 5-24Vdc, 8-50mA.
>
>Does anybody have any suggestions for a control. I have a Delta Tau that came with it, but it is more of a positioner control and doesn't have any interface for machine code, just loops and macros etc.
>
>

You could use the Servo-to-Go card, or my PPMC board set, with EMC.

3 MHz? Really? With a 1024 cycle/rev encoder, you get 4096 counts/rev.
Now, to get a count rate of 3 MHz, you need 3 million/4096 = 732
revs/second,
or 44,000 RPM. Can these motors really do 44000 RPM? What will happen to
your leadscrews at that speed? (I know the answer, they'll look like
pretzels!)

Jon