Tree Journeyman 320 B Retrofit

[will gilmore]

I also just realized my link in post 54 just goes to the general gecko support page. I wanted to link to this image:

http://www.geckodrive.com/images/fck...EStop800PW.jpg

You can find the explanation in application notes>>servo drives>>electro mechanical estop

[Al_The_Man]

The AMC have an internal jumper that will configure the Enable active hi or low.
In the default condition you can use a N.C. contact.
The AC neutral and all DC commons normally have their own common terminal strip but these should have a conductor connected to the star point ground block.
An important thing is to ground or bond motor frames and moving parts of the machine to this block.
The siemens PDF is a good ref for the bonding practice.
http://www.automation.siemens.com/do.../emv_r.pdf?p=1
Ground Practices
If you read section 6 of the sieimens PDF, they advise a common current recommendation of grounding both ends of a shielded cable when proper bonding practice is observed.
Al.

[Al_The_Man]

I also just realized my link in post 54 just goes to the general gecko support page. I wanted to link to this image:

http://www.geckodrive.com/images/fck...EStop800PW.jpg

You can find the explanation in application notes>>servo drives>>electro mechanical estop

IMO that a bit of a long winded way of E-stop, the trouble is that every supplier seems to cater to his own equipment and does not include the whole machine, if you have a main contactor or relay shutting off power to drives and spindle and any other thing that needs E-stop, the E-stop control relay can just have a contact that cuts power to the contactor coil etc.
Al.

[will gilmore]

I understand what you are saying and I am planning to do what you suggest on the control side. I already have the power resistors and relay. Do you recommend I implement them as shown (crowbar resistors across PS) to stop the motors quickly?

[will gilmore]

Thanks for the links.

My only remaining question from above is what to do with the 5V TTL fault output of the drives.

I've removed almost everything from the cabinets that I don't think I will need. I'm going to start putting new things in. My current question is where do I need fuses?
Existing fuses:
30A x 3 at service input
120VAC fused with unmarked fuse after transformer
24VDC is only fused for an external machine light unless the fuse was inside the controller.

Places I need fuses:
Between service input and servo power supply? PS is 1.5KVA

Between servo power supply and servo drives? Max peak current for the drives is 30A but I'm limiting output to 12.5A peak with the DIP switches and pots.

On output of 5VDC logic PS?

Any good links on fusing like the ones on grounding?

[Al_The_Man]

Usually you have a fused disconnect and then sub fusing for each power item such as Powers supplies drive etc.
I use something like a ULN2803 IC to feed a signal to each drive for disable with a common input from a relay contact and use the same IC, if necessary to output the drive alarms, the open collectors can be paralleled.
This is an example out of NFPA79 for power distribution, just substitute 1ph for 3ph.
Al.

[will gilmore]

Here is a data sheet for the ULN2803 http://www.st.com/internet/com/TECHN...CD00000179.pdf

Is the ULN2803 a better solution than using a NC relay contact to disable the drives? Can I use it to pull the enable pin low?

Are you suggesting I use the UNL2803 to add the drive fault output to the estop chain?

[will gilmore]

Sorry I've been bad about posting pictures. Cabinets stripped of drives and controller. Last picture shows MESA 7i48 and 5i37TA in place.

[Al_The_Man]

I will draw up the ULN suggestion in a while and post it.
If you need multi fuse barrier, there is Ferraz-Shawmut 30320, they click together to create multi section, they use a standard 1-3/4" Buss fuse.
I find it easier to take the back panel out and fit and wire flat on the bench. .
Al.

[will gilmore]

good idea.

[will gilmore]

I tested the 120V transformer this morning. 213VAC in 111VAC out. I assume this will be good enough as it is w/in 10% of 120V?

[Al_The_Man]

Should be good.
Al.

[will gilmore]

I'm looking for a relay to cut power to the servo PS and do the servo braking. The PS is <80VDC, 3 resistors 2 ohms each. 80V/6ohms=13.3A. I was hoping to use a relay already in the machine but they are only good for 10A. I started looking for relays and the ones that have DC ratings are for 28VDC (McMaster-Carr 30A@28VDC).

Should I use an ice cube type rated for 15A (AC), above mcmaster relay, something like a motor contactor, or something I haven't thought of?

Also, to cut power to the servo PS should I open one input or both?

[will gilmore]

On the inhibit / enable front: I've started wiring the MESA boards and I realized the 7i48 has enable transistor outputs. 36VDC, 10mA max.

The drives are disabled when pulled to ground and enabled when open or pulled to 5V. Can I use a pull down resistor (what value? 1k?) to pull the inhibit pin to ground and use the enable output to pull it to 5V?

[Al_The_Man]

The AMC drives enable can be inverted by jumper J1.
there is a 5k pullup resistor internal.
All you need is a TTL signal in.
For cutting power to drives and Spindle etc, I usually use a 3 phase contactor, they can be picked up cheap on ebay, Telemecanique is a nice compact DIN style.
Al.

[will gilmore]

Ok i see J1. Out of curiousity how did you know that is the jumper to remove? I notice the manual says the jumper should be removed by someone familiar with SMT soldering. What do I need to know besides dont get the board too hot? After I remove the jumper 5v will be enable and open will be inhibit?

[Al_The_Man]

After I remove the jumper 5v will be enable and open will be inhibit?

Correct, the jumper used to be a standard .1" hardware jumper that just unplugged, I guess they have changed it?
It is mentioned in the engineering set up data, this is also on their site.
Al.

[will gilmore]

Correct, the jumper used to be a standard .1" hardware jumper that just unplugged, I guess they have changed it?
It is mentioned in the engineering set up data, this is also on their site.
Al.

I see you have past experience. The manual I'm using says there is a jumper to remove and to consult the data sheet to see which one. The data sheet doesnt say anything about it.

[will gilmore]

Scary small.

How about this contactor. Telemecanique LC1 D09 Contactor LC1D09 25A 24V Coil | eBay 1 NO contact to cut AC power to the servo PS and 1 NC contact for the power resistors. Is it ok to only break one leg of the AC power to the PS?

[Al_The_Man]

I usually get the 3ph contactors for the extra contacts for spindle etc.
I believe that coil is 24vac also, in case you were looking for DC?
Also all the telemecanique relays have the option of fitting multi-auxiliary contacts that clip onto the front operator.
Al.