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encoder resolution checking
« on: February 03, 2009, 07:31:50 AM »
ive purchased a mazak servo motor but cant work out the encoder resolution accurately. (required for the drive im using)
is this possible to check by interfacing to mach3 encoder inputs? if so any settings or a how to would help. thanks
(i can configure pins etc and make wiring connections)
if its not broken yet, fit more gadgets!

Offline Hood

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Re: encoder resolution checking
« Reply #1 on: February 03, 2009, 08:26:46 AM »
If you have an oscilisope you could hook up a chanel to it and rotate the motor at a known speed and get the pulse rate that way.
 If you dont then hooking up to Mach and zero the encoder DRO and rotate the motor 1 turn and you should get a reading in the DRO. Never tried that so I am unsure how Mach is expecting things but would think best to set the Count unit to 1 and see, if the reading is exceptionally low then you maybe multiply that by 4.

The encoder may however not be an incremental one, are there any markings on it?

Hood
Re: encoder resolution checking
« Reply #2 on: February 03, 2009, 01:09:21 PM »
it has a a- b b- c c-
and u u- v v- w w-

no z and minus z?

incremental? absolute? or waste of time? lol

im using a yaskawa drive which is looking for a z + and z-
worked out the ppr = 2500

just got to work out if i can get a z pulse from it now
if its not broken yet, fit more gadgets!

Offline Hood

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Re: encoder resolution checking
« Reply #3 on: February 03, 2009, 01:46:50 PM »
C is your index pulse
U V W seems to suggest it may also have some sine wave output, possibly for commutation?
Hood

Offline Hood

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Re: encoder resolution checking
« Reply #4 on: February 03, 2009, 01:47:43 PM »
Are there not any manufacturers name and code on it?
Hood
Re: encoder resolution checking
« Reply #5 on: February 03, 2009, 02:09:15 PM »
motor is yamakazi mazak
encoder is sanyo denshi

no part numbers apart from motor 0930 252a
its a 1kw presume the 930 part of the number
25 i presume is encoder 2500 ppr
wondering if the a stands for absolute, as i cant find a z pulse

the u v w are long pulses, presume comutation with phases u v w
if its not broken yet, fit more gadgets!

Offline markn

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Re: encoder resolution checking
« Reply #6 on: February 03, 2009, 02:11:26 PM »
Hi All,

Sounds like you are dealing with a resolver, different animal.

Offline Hood

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Re: encoder resolution checking
« Reply #7 on: February 03, 2009, 02:28:11 PM »
markn
I would expect maybe 6 connections to a resolver but a pic would probably help identify if it were.


battwell
What are you getting from the C?

Hood

Offline Hood

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Re: encoder resolution checking
« Reply #8 on: February 03, 2009, 02:39:25 PM »
Also any numbers on the motor? Presumining its a Yamazaki rather than Yamakazi? Yamazaki is European Mazak I think.
Hood