-10V to 10v circuit

[vre]

VFD is this ( Huanyang SL-440EE ) http://www.hy-electrical.com/bf/SL%2...s%20Manual.pdf
Servo is this chinese Yifeng AC servo motor drive controller AASD 30A - DinoDirect.com
manual http://www.mycncuk.com/forums/attach...vo-drives-.pdf

[JAZZCNC]

Man that's one crap manual and very hard work reading.

Anyway you don't need +/-10v it just means the drive has the abilty to use Analog signal if that's what your control used. Lot's of older Machines used analog controllers so they provide it for compatibilty reasons but Step/dir is the more modern way.

In your case you'll use Step/Dir from the motion Control device you use, whether that be Parallel port or External Motion controller. If your using Mach3 then I highly suggest you get a motion control Card has the Parallel port will not be fast enough for servos with 2500cpr encoders.

To control the VFD spindle speed you just need a 0-10V signal which can come from either an external speed control card or one built into a BOB. Can also use RS485 I believe but not done it my self can't help here.