Tree Journeyman 320 B Retrofit

[will gilmore]

Ta da!

I found some AMC drives on ebay so I made a last minute switch to Mesa. I ordered the 7i48 instead of the 7i33.

[jsheerin]

If they're Amp connectors, look on the front and back for a molded part number. A lot of times it will be there, but really small. Even if you just get the insert number, that would help. A full part number would be something like MS3106A22-14S. 22-14 is the insert number which describes the arrangement and number of pins. S is for socket (P is for plug), and the MS3106A part describes the rest of the connector. Mouser has them. If they're real expensive, I've found surplus ones on ebay for less, but that can be hit or miss.

[will gilmore]

If they're Amp connectors, look on the front and back for a molded part number. A lot of times it will be there, but really small. Even if you just get the insert number, that would help. A full part number would be something like MS3106A22-14S. 22-14 is the insert number which describes the arrangement and number of pins. S is for socket (P is for plug), and the MS3106A part describes the rest of the connector. Mouser has them. If they're real expensive, I've found surplus ones on ebay for less, but that can be hit or miss.

Thanks! I had looked for the part number but it was there very tiny on the edge of the panel mount. Mouser has them for $2.81 and the socket contacts too.

[will gilmore]

Ok. The last big thing I need to order is the power supply. I'm using AMC B30A8 servo drives which have a maximum of 80V. I'm looking at 1.5kva power supplies from Antek. Antek - Transformers - Grid View[]=1
To complicate things further I have 208V service in this shop (measured at 213V)
Should I get 80V 16.5A, 77V 19.5A, 70V 21.4A? At some point I will probably move somewhere with 230V service.

[Al_The_Man]

Thanks Al. I wondering if I should try to reuse the speed sensor and control board. I'll leave it alone until I get the axes running.

Any one know where I can buy these connectors? It would be handy to use them to break out the wires coming from each axis rather than cutting these up. They are Amphenol which I looked up but they make 1000s of different connectors.

Those are Amp CPC style, just about everyone sells them. They are not MS types but much cheaper plastic versions.
DigiKey, Mouser etc.
You could use the sensor as a tach, the output is analogue.
The 30A8's are cutting it a bit fine for those motors?
Al.

[will gilmore]

Those are Amp CPC style, just about everyone sells them. They are not MS types but much cheaper plastic versions.
DigiKey, Mouser etc.
You could use the sensor as a tach, the output is analogue.
The 30A8's are cutting it a bit fine for those motors?
Al.

I haven't thought / learned much about the spindle speed sensing in EMC. I know it supports rigid tapping with some kind of positioning input.

B30A8: 80VDC 15A continous. I thought it seemed like a good match to the motors. Not true?

[Al_The_Man]

IRC your motors are around 80vDC?
These drives shut down at 86v so it does not give much room for PS or BEMF tolerance?
Al.

[samco]

You need an encoder on the spindle for rigid tapping with A,B and Z channels.

sam

I haven't thought / learned much about the spindle speed sensing in EMC. I know it supports rigid tapping with some kind of positioning input.

B30A8: 80VDC 15A continous. I thought it seemed like a good match to the motors. Not true?

[will gilmore]

IRC your motors are around 80vDC?
These drives shut down at 86v so it does not give much room for PS or BEMF tolerance?
Al.

Ok. Should I choose a slightly lower PS voltage to provide some room?

[will gilmore]

You need an encoder on the spindle for rigid tapping with A,B and Z channels.

sam

The speed sensor is not located on the axis the spindle. It is in the back of the aluminum cylinder on the top left of this picture. I'm not sure how the high / low gears work but it looks like the censor would be on the motor side of the gears.

[Al_The_Man]

You may need to go lower on PS or higher on drives, unless you already have them.
The print does not show the output of the LM2917, but I suspect it may have gone to an analogue (moving coil) meter?
Al.

[will gilmore]

I'm reading through the AMC drive information.

http://www.a-m-c.com/download/manual...tallManual.pdf - Manual
http://www.a-m-c.com/download/support/an-007.pdf - Running brushed motors
http://www.a-m-c.com/download/datasheet/b30a8.pdf - Data sheet

These drives can take many types of inputs and run in many modes. I am going to use +/- 10V analog input with current (torque) mode?

There is also a tach on the motor and tach wires coming into the cabinet that were hooked up to the original drive. Do I leave this disconnected?

[Al_The_Man]

Yes, you don't use the tach in torque mode.
I just take the brushes out of the tach to avoid problems.
Al.

[will gilmore]

You may need to go lower on PS or higher on drives, unless you already have them.
The print does not show the output of the LM2917, but I suspect it may have gone to an analogue (moving coil) meter?
Al.

I already have the drives. I saw them on ebay and bought them. Serves me right for buying with out asking the forum. What size PS do you recommend?

The LM2917 was part of a larger speed control board that turns a 120V motor that controls the variable speed in the head.


tree manual 018 by Gotham Machine, on Flickr

[Al_The_Man]

Out of the P.S. options I would go with the 70v.
The spindle drive used it as a digital to analogue tach.
Al.

[will gilmore]

Out of the P.S. options I would go with the 70v.
The spindle drive used it as a digital to analogue tach.
Al.

The Antek power supplies come in 80VDC, 77VDC, 73VDC, 70VDC, 67VDC etc. Am I correct in thinking that an unregulated PS will produce somewhat lower output DC voltage when run on 208VAC input rather than 203VAC input? So all the DC voltages would be ~10% lower?

EDIT: 203VAC above should be 230V. oops

[Al_The_Man]

?? it will be higher on 208 rather than lower over 203v!
Output voltage is directly proportional to the transformer ratio, input to output.
What have you actually measured, BTW?
Al.

[will gilmore]

OOPS. I intended to write 230VAC not 203VAC.

I have measured the voltage at the panel to be 213VAC.

I believe the power supplies are rated for 230V input. If I use a 230VAC/80VDC on my 213VAC circuit I will end up with (208/230)*80 or 74VDC right?

Sorry for the confusion. Thanks for your help. You are very generous with your time and knowledge!

[Al_The_Man]

or 75.29v on your 213
Or close enough
Al.

[will gilmore]

So is that enough of a buffer?