PMDX Forum

General Category => Parallel Port breakout boards, motherboards, and dedicated accessories => Topic started by: KG7AMV on July 14, 2015, 10:11:25 AM

Title: Feed Rate & Spindle Speed Override Wiring?
Post by: KG7AMV on July 14, 2015, 10:11:25 AM

Using a PMDX 126 W/ESS, PMDX 107, HITACHI WJ200-022SF VFD

Wondering if anyone has a wiring info/diagrams for a Feed Rate & Spindle Speed Override. Or if it is Possible using mach 3.

Ideally would like to add 2 potentiometers to the machine to control both?

Thanks.

Title: Re: Feed Rate & Spindle Speed Override Wiring?
Post by: Bob at PMDX on July 14, 2015, 11:14:16 AM

That's tough.  To get analog signals into Mach3 you will need some external device with analog-to-digital capabilities and a plug-in for Mach3, as well as (possibly) some hand-written macros or "Brains" scripts.  Something like the PoKeys** devices (http://www.poscope.com/PoKeys56U, for example), though I don't know if you can use the PoKeys plug-in without having the PoKeys device be the "motion controller" (instead of the ESS).

Bob

** this is not an endorsement of this device, just mentioning it as something that could work.  I have very little direct experience with the PoKeys devices and zero experience with their Mach3 plug-in.

Title: Re: Feed Rate & Spindle Speed Override Wiring?
Post by: KG7AMV on July 17, 2015, 06:11:36 PM

I am thinking a 3PDT Switch or Relay for the Speed Pot? To be able to Select Automated Mach Control or Manual Pot Control? No to Concerned right now about the federate override.

Title: Re: Feed Rate & Spindle Speed Override Wiring?
Post by: Steve Stallings on July 19, 2015, 03:21:40 AM

Using a switch or relay to do the job will work fine. Only a DPDT configuration is needed because you can keep the low side of the potentiometer in the circuit all the time because removing the high terminal and wiper connections effectively removes it from the circuit.

Feedrate override is a different animal and you will need to provide signals to Mach3 to accomplish that.
With a suitable macro it may be possible to use digital inputs to accomplish "Increase Feedrate" and "Decrease Feedrate" functions.

Title: Re: Feed Rate & Spindle Speed Override Wiring?
Post by: KG7AMV on July 19, 2015, 08:35:29 PM

Thanks Steve

Connections PMDX-107 to WJ200-022SF

Rev/Dir  to Terminal 2 on VFD
Fwd/Run 1 to Terminal 3 on VFD
COM to P24 on VFD or + 24 on External Power Supply
Aref  to H on VFD
Aout  to O on VFD
Agnd - L on lower row on VFD

Title: Re: Feed Rate & Spindle Speed Override Wiring?
Post by: Steve Stallings on July 21, 2015, 09:50:30 PM

To switch between Auto and Manual speed control you would need to switch
the H and O connection of the VFD between the PMDX-107 and your pot.

The L connection can be connected to both the pot and the PMDX-107 all
the time.