DMM DYN2 wiring question - I might be a dummy

[ecdez]

I'll try my best to keep with the instructions for asking questions.

I have done a conversion on a Hurco mill with different components and I only mention this to say that I've done one before but still consider myself a novice.

The current project I have is a Hardinge AHC with an Accuslide attachment and the old Fagor has thrown in the towel so it's time for an "upgrade".

I do not have any hardware as of yet. I like to have a good understanding of what I'm getting into before spending money. I'm old fashioned that way

My intentions are to use an Acorn board with DMM drivers / motors (DYN2 and DST 0.4kW AC Servo).

In the wiring diagram it shows the step and direction going to pins 2 and 3. In my case with two axes I would assume another DYN2 would go to pins 4 and 5. However, the other 3 wires coming from the DYN to the Acorn (ZRI [pin11], ALM [pin15], COM [pin25]) appear to share common connections. That is, the wires from all drivers, in my case 2, go to these terminals. Am I reading that correctly? Also if I get a DB25 cable and run it to one driver can I just daisy chain the other driver for those 3 wires?



As a follow up question; In my research thus far I came across another thread where a response says

"You will need a DB25 breakout board (you don't wire to Acorn H2/H3 connectors.
You can buy the breakout board on Amazon:
http://a.co/iPUQQec"

(viewtopic.php?f=60&t=2043&p=14022&hilit=dyn2#p14022)




The wiring diagram does not show that so is it accurate? You can't use the H2 and H3 terminals for the DMM and you need a separate breakout board?


Thanks in advance!

[slodat]

I am doing an Acorn conversion on a Hardinge with Accuslide. I made a new motor bracket for the X axis servo. I went with the same motor and DYN4 drives. I use the DB25 step and direction signals. I’ve done a lot of testing on two different DYN4 Acorn systems and the screw terminals were causing lost steps. Moving to the DB25 for step and direction resolved this issue for me and many others. Lots of info in my thread.

[martyscncgarage]

I'll try my best to keep with the instructions for asking questions.

I have done a conversion on a Hurco mill with different components and I only mention this to say that I've done one before but still consider myself a novice.

The current project I have is a Hardinge AHC with an Accuslide attachment and the old Fagor has thrown in the towel so it's time for an "upgrade".

I do not have any hardware as of yet. I like to have a good understanding of what I'm getting into before spending money. I'm old fashioned that way

My intentions are to use an Acorn board with DMM drivers / motors (DYN2 and DST 0.4kW AC Servo).

In the wiring diagram it shows the step and direction going to pins 2 and 3. In my case with two axes I would assume another DYN2 would go to pins 4 and 5. However, the other 3 wires coming from the DYN to the Acorn (ZRI [pin11], ALM [pin15], COM [pin25]) appear to share common connections. That is, the wires from all drivers, in my case 2, go to these terminals. Am I reading that correctly? Also if I get a DB25 cable and run it to one driver can I just daisy chain the other driver for those 3 wires?



As a follow up question; In my research thus far I came across another thread where a response says

"You will need a DB25 breakout board (you don't wire to Acorn H2/H3 connectors.
You can buy the breakout board on Amazon:
http://a.co/iPUQQec"

(viewtopic.php?f=60&t=2043&p=14022&hilit=dyn2#p14022)




The wiring diagram does not show that so is it accurate? You can't use the H2 and H3 terminals for the DMM and you need a separate breakout board?


Thanks in advance!

Z must be Axis 1
X must be Axis 2
You are following the attached schematic? Dyn2 drives are fine, you just have to use a DC power supply to drive them.
You can use the Acorn screw terminals if you like for the inputs.

Slodat has a point, if you use DYN4 you don't need the DC Power supply. If you have to buy a DC power supply, you might find it offsets the cost and makes the DYN4 more attractive and easier to wire up.

[ecdez]

Thanks for the responses thus far!


Looks like I have a thread to binge read


I do have to buy a power supply; I didn't realize the DYN4 would eliminate that. Would definitely be a cost savings.

[martyscncgarage]

Thanks for the responses thus far!


Looks like I have a thread to binge read


I do have to buy a power supply; I didn't realize the DYN4 would eliminate that. Would definitely be a cost savings.

Not an issue if you haven't made the purchase yet

[slodat]

DYN4 also has the ZRI output.

[slodat]

ecdez: post some photos of your lathe. I designed a bracket to mount the X axis motor. Happy to help if you need it.

[Richards]

In the wiring diagram it shows the step and direction going to pins 2 and 3. In my case with two axes I would assume another DYN2 would go to pins 4 and 5. However, the other 3 wires coming from the DYN to the Acorn (ZRI [pin11], ALM [pin15], COM [pin25]) appear to share common connections. That is, the wires from all drivers, in my case 2, go to these terminals. Am I reading that correctly? Also if I get a DB25 cable and run it to one driver can I just daisy chain the other driver for those 3 wires?

The Step and Direction signals are OUTPUTs (received from) from the Acorn. The ZRI and Alarm signals are INPUTs (sent to) the Acorn. The ALARM signal is connected to any one of the Acorn's Inputs and then the Wizard is used to configure that input as an Alarm input. The ZRI signal is sensed by the Acorn's encoder input. Marty has an excellent video on how to use the ZRI signal

[ecdez]

ecdez: post some photos of your lathe. I designed a bracket to mount the X axis motor. Happy to help if you need it.

Thanks, and I will. Probably start a new thread for it

The Step and Direction signals are OUTPUTs (received from) from the Acorn. The ZRI and Alarm signals are INPUTs (sent to) the Acorn. The ALARM signal is connected to any one of the Acorn's Inputs and then the Wizard is used to configure that input as an Alarm input. The ZRI signal is sensed by the Acorn's encoder input. Marty has an excellent video on how to use the ZRI signal

Got it, good to know. I'll have to look for that video. The better I understand it the better off I'll be!

[martyscncgarage]