VSD-E HOME INPUTS

[polaraligned]

Using 3 VSD-E drives with Mach 3.
Have separate home switches for each axis.
Using CNC4PC BOB.

The Home switches normally go into the BOB and Mach 3 takes care of homing.

Can the Home inputs of the VSD-E drives do anything for me?

I don't see any clear documentation to their use.

Thank You,
Scott

[scrambled]

Scott-

Have you had any luck getting an answer to this question? I am about to start wiring my drives, and I had the same question.



Steve

[Juka]

Originally Posted by scrambled Scott- Have you had any luck getting an answer to this question? I am about to start wiring my drives, and I had the same question. Steve

"Home switch signals routed from VSD-E's to PC"

You can also use them homing with encoder index signal. Look also GDtool manual (page 22/26).

http://www.granitedevices.fi/assets/...epi_manual.pdf
http://granitedevices.datamappi.com/...ool_manual.pdf


Juka

[polaraligned]

So my home switches go to the VSD-E home inputs.
I can trigger a home search by using one of the VSD-E inputs.

How do I tell Mach 3 that the machine is homed? Is there an output to tell Mach 3?

Scott

[Xerxes]

Juka is right, connect home switch to VSD-E encoder connector pins and VSDEPI routes it to PC. There are two ways to do homing (choose only one):
1) Configure Mach to use home switch signals from VSDEPI.
2) Use drive internal automatic homing function (starts at power-up). Configured from GDtool.

Pros and cons of each method:
1)
+Mach will know when homing is done.
2)
+Can also utilize encoder index pulse for highest precision
+Can use hard stop homing (no switch needed)
+Activates optional internal position limits of drive, can't accidently drive axis out of mechanical travel
-PC will not get any information when axis is homed due to limited number of of input pins in parallel port

[Juka]

Originally Posted by Xerxes Juka is right, connect home switch to VSD-E encoder connector pins and VSDEPI routes it to PC. There are two ways to do homing (choose only one): 1) Configure Mach to use home switch signals from VSDEPI. 2) Use drive internal automatic homing function (starts at power-up). Configured from GDtool. Pros and cons of each method: 1) +Mach will know when homing is done. 2) +Can also utilize encoder index pulse for highest precision +Can use hard stop homing (no switch needed) -PC will not get any information when axis is homed due to limited number of of input pins in parallel port

Does "hard stop homing" mean, homing with currentlimit ? Unbelievable!

Juka

[Xerxes]

Originally Posted by Juka Does "hard stop homing" mean, homing with currentlimit ? Unbelievable! Juka

Yes, there is independent current limit adjustment in Homing controller page of GDtool.

[keebler303]

Originally Posted by Xerxes Yes, there is independent current limit adjustment in Homing controller page of GDtool.

Smart. Is this common practice in industry? I would think it would not be terribly repeatable due to having a chip stuck somewhere or something like that.

Matt

[Xerxes]

Matt,

I think I have seen similar feature in few other drives, too. One should set high enough limit to make it repeatable in typical situations. Limit is there just to protect machine from excessive force when touching axis end.

[H.O]

Nice work on the VSD-E, Xerxes!
I've used the "hard-stop" homing on the EPOS-line of intelligent servo drives from Maxon. It worked very well, I just set the limit to ~20% more than what it took to move the axis at the homing speed. This was on a rather small "clean" machine though. Just don't try hard-stop and Index ;-)

/Henrik.

[polaraligned]

Originally Posted by Xerxes -PC will not get any information when axis is homed due to limited number of of input pins in parallel port

I have plenty of inputs with my second parallel port plus ModIO.
I would think I could run one of the VSD-E general purpose outputs to my break-out-board and signal to Mach that home is completed, right?

Scott

[keebler303]

Originally Posted by polaraligned I have plenty of inputs with my second parallel port plus ModIO. I would think I could run one of the VSD-E general purpose outputs to my break-out-board and signal to Mach that home is completed, right? Scott

The smoothstepper also has a relative plethora of inputs.

Matt