Thread: AC servo motor help !
I am at the point of buying the same servos. At the manual it states it works both on one phase and 3 phase, but nothing more. By the way if you don't have the manual i can mail it to you.
I will follow how this develops, hopefully it will work.
please send me (check your pm)
Hi just send you the message with the manual. I believe there is should be enough capacitance and the drive to be prepared for the single phaze.
Look at the snip from the manual below and from another similar Chinese drive:
It seems the connection should be between L1 and L3/ judging from 3rd picture where they are named R and T/- i mean the phase and the middle one to be 0.
But dont trust me on this, just open it and see whats there and think
Last edited by Boyan Silyavski; 29-12-2013 at 01:57 PM.
Ιam searching 2 days and i haven't found it!
Where you found it ? respect!!!!!!!!!!!!
I have also read (in chinese with translator) that these drivers is imitated (good imitation) but which is the original to download manual in
English from original manufacturer ?
Some photos of this drive:
(You can see the big smoothing caps, the 2 rectifiers which are down from caps also you can see that pcb supports
CN1 connector but missing this connector and some smd components near it.
I believe that is rs232/485 connector. Has someone schematic to add the extra components ? )
Last edited by vre; 29-12-2013 at 07:24 PM.
Fred from BST automation / Aliexpress/ send it to me as i am at the point of buying from him the major mechanical and electrical components.
I am not sure but it seems from the 1st photo that L1 and L3 as i suggested are where the phase will go, judging from the fuses. But when in doubt i go to a local electronic repair shop and for 1 min the guy solves my doubts with advice, so that will be the wise choice to do.
I believe they should be Mitsubishi most possibly. But- bear in mind that every copy is a thing on its own, just use the manual i send you. yeah, i know, the crappy Chinese English translation.
Thank you i will check it.
Look and other sellers BST automation is not the cheaper...
For now he is my best choice of supplier from China.
Not that i am an expert, but common sense tells me that by the way Lauren connected his drive he achieved nothing more than using only 1 rectifier, assuming his drive has similar schematic.
From what i see the way to use the 2 rectifiers will be to connect /phase and ground/ to each rectifiers 2 legs /s and s / in parallel which means the rect 2 s and s inputs MUST be un soldered or the path cut with exacto knife so that they are not together
It probably will work without problem with 1 rectifier.If is not possible to unsolder the rectifier legs or split the path with exacto knife, having in mind that on ebay are selling big heavy duty rectifiers for dirty cheap, just 1 bigger rectifier and forget about connecting the second.
PS. Dont mess adding components, what is written on a board and is missing, does not mean you can add it without understanding what you are doing.
Last edited by Boyan Silyavski; 30-12-2013 at 12:35 AM.
The pcb over the rectifiers has some ceramic caps as shown in photos. So its probably better to not modify the pcb.
I will check what these small ceramic caps do...
I think (please correct me if iam wrong) that if you bridge 2 ~ of 1st rectifier (means to bridge L1 with L2) and connect phase/neutral to L1-L2/L3 i think all diodes (8 from 8) used without modifying the pcb.
To understand why this happens see following the image
(In second rectifier the 2 ~ are allready bridged so you must bridge the 2 ~ of first rectifier to make all diodes to work with single phase 230VAC)
I will check with oscilloscope if the smoothing in single phase is ok with default caps and if the driver need more caps for smoothing...
I have tested the servo motor/driver with phase/neutral connected in L1/L2 and L3 unconnected (using only 1 rectifier) and seems to working.
To use 6 diodes from 8 totally with this type of pcb wiring you must connect phase/neutral to L3/L1 or L3/L2 because the in 2nd rectifier
the 2 ~ legs are bridged. With phase/neutral to L1/L2 only 4 diodes of 8 used.
I have understand what missing components do. They are very cheap and i can't undestand why the manufacturer did not added them to give rs232/485 communication port.
The question is if LCMXO640C-3TN144C chip supports rs232/485...
Iam not having schematic for missing components but i found what they do.
U22 is a max232 ic (for rs232) and u35 is a sp485 ic (for rs485) 6 pin cn1 connector is a mini 6pin din ( PS/2 ) connector witch provides rs232 & rs485 connection.
I have downloaded the datasheets of these ics (show in example circuits adjacent components values) and followed the traces in pcb and from that i read in manual you send me i beleive that i would find the extra smd resistors/caps/choke coils/diodes.
I have already ordered from ebay max232 & sp485 also i have oscilloscope & some spare smd resistors/caps/chokes/diodes so i would try
to add in this servo driver serial communication port.
The is no risk to burn some critical because D11 & D12 missing diodes is for protecting the LCMXO640C-3TN144C chip.
Last edited by vre; 30-12-2013 at 12:33 PM.
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