Need Help!- Pin outs for Panasonic AMKB100G20NAL AC servo motor

[RRRoamer]

Gents,

I picked up a Panasonic AMKB100G20NAL AC servo motor off eBay (very cheap!), but have not had any luck finding any data sheets on the drive or it's encoder (drive is simple, encoder, not so much!). Here is what I do know abou this servo:

Drive:
Model number: AMKB100G20NAL
Secondary number: 92MB1924 (serial number?)
Tertiary number: AMGB0527ZZ (printed on plate, not stamped into it like the other two numbers)
Three phase wires and ground
10 Ohms phase to phase
~2 MOhms ground to each phase
200V (data plate)
100W (data plate)
0.319N (data plate)
3000 rpm

Encoder:
DB25
First Row:
Pin 1: Red - Black stripe
Pin 2: Solid Red
Pin 3: Yellow - Black stripe
Pin 4: Solid Orange
Pin 5: Solid Dark Blue
Pin 6: Solid Yellow
Pin 7: Grey - Black stripe
Pin 8: Solid Grey
Pin 9: Solid Mauve
Pin 10: Solid Dark Blue
Pin 11: Brown - Black stripe
Pin 12: Solid Green
Pin 13: White - Red Stripe
Second Row:
Pin 14: White - Blue stripe
Pin 15: Solid Black
Pin 16: Green - Black stripe
Pin 17: Orange - Black stripe
The rest are empty

From looking at it, it is very easy to say that pin 15 (solid black) is ground as it is also several wire gauge sizes larger than the rest. Other than that, I don't have a clue!

Does this pin configuration/colors ring a bell with anyone? If I take the cover off the encoder housing, what should I look for in the way of identifiable markings to positively ID the encoder?

Thanks for the help!

[RRRoamer]

Ouch! 111 looks but no one was able to help... Oh well! That just forced me to tear the thing open and spend some quality time with my bench meter and my scope to see what this thing does. I have updated the pin outs in the first post with the latest information.

Ok. Maybe I WON'T edit the original post! It looks like the edit window has past. Well, here is the updated info anyway:

Encoder:
DB25
First Row:
Pin 1: Red - Black stripe - 1Y (Encoder output 1 positive output from RS422 chip)
Pin 2: Solid Red - 1Z (Negative output from RS422 differential driver)
Pin 3: Yellow - Black stripe - 2Y (Encoder output 2 positive output from RS422 chip)
Pin 4: Solid Orange - 2Z (Negative output from RS422 differential driver)
Pin 5: Solid Dark Blue - 3Y (Output 3 positive output from RS422 chip, No signal on this driver)
Pin 6: Solid Yellow - 3Z (Negative output from RS422 differential driver, again no signal seen)
Pin 7: Grey - Black stripe - Apparent Hall sensor A output
Pin 8: Solid Grey - Apparent Hall sensor C output
Pin 9: Solid Mauve - Apparent Hall sensor B output
Pin 10: Solid Dark Blue - Unsure. It has a higher frequency square wave output like the encoder outputs, but it does NOT go through the differential driver chip
Pin 11: Brown - Black stripe - 4Y (Output 4 positive output from RS422 chip. Appears to be encoder output, but not sure)
Pin 12: Solid Green - 4Z (Negative output from RS422 differential driver)
Pin 13: White - Red Stripe - VCC (+5V DC) and also tied to "G" positive enable pin on RS422 chip
Second Row:
Pin 14: White - Blue stripe - !G negative enable pin on RS422 chip. Tied to ground
Pin 15: Solid Black - Ground, as expected
Pin 16: Green - Black stripe - Unknown. No signal detected by scope or meter
Pin 17: Orange - Black stripe - Unknown. No signal detected by scope or meter

[Al_The_Man]

Is there any make indicated on the encoder? sometimes it is on the glass disc if this is visible.
The complements for the differential encoder signals can be detected with a scope, sometimes the commutation pulses have complements.
The marker pulse is hard to see due to the short duration.
Also the commutation pulses will coincide with their relative stator phase.
Al.

[RRRoamer]

What all signals should I expect from an encoder? So far, I have found what appears to be three sets (push pull from RS232 chip) of encoder outputs (I only expected two...) and what appears to be three hall sensor (probably better called commutation outputs) for each of the three phases.

The encoder data is definitely sent via a push-pull RS422 converter. I found that chip and ohmed it all out. It looks like all of the four pairs are connected to the DB25.

What is surprising is that the third pair (3a/3Y/3Z) is connected to the DB25 cable, but I am not seeing any output on my scope. I think my next step needs to be spinning this encoder with another motor so I can get a more consistent output from the encoder and see if maybe there are signals there that I just couldn't trigger on while spinning it by hand.

[Al_The_Man]

If you have a differential driver you should expect an A & B pulse phase shifted 90°, these will also have a complement signal for each, this also applies to the once-per-rev marker pulse, 6 so far.
The encoder pulse duration will depend on its resolution (pulses/rev).
If commutation pulses are present, the repetition will depend on how many poles the motor has, for an 8 pole motor there are 4 repetitions or electrical revolutions per mechanical one.
http://users.tinyworld.co.uk/flecc/4...otor031102.swf
The encoder pulses will be 3 or 6 depending on whether they have complements.
Al.

[keebler303]

Sorry I didn't see this sooner, maybe the wire colors are similar to the panasonic motor I was working on a while back:

http://www.cnczone.com/forums/showth...ight=panasonic

Matt

[RRRoamer]

I'm even worse! They do appear to be correct and the pics you posted look exactly like mine.

[manmardam]

this is Gold.


Amir