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Hi, now re-labeled as "SOLVED"

Hi,
Very long between updates, but this machine has been a little in the back seat the last 10-12 years.

Anyway, in 2021 I changed the spindle drive, servo drives, power module etc to the newer...

MrMetric,

Oh dear!! Absolutely no intention to value things here, just report. Apologies to dm17ry, hope you are OK and soon back with us! I have a ton of respect for your skills.

Regarding...

OK, I am back to update this thread.

Back in 2022 there were plans to reprogram my original OSE 253 encoders, so they would be accepted by my newer C1 drives, with the help from dm17ry. However he...

Just a little update,

Right now dm17ry evaluates some possible USB-to-RS422 adapters in order to recommend one to build
my cable with. (Thanks dm17ry).

I will be back later when I have some...

I checked the SV019 and SV020 parameter ranges for the Meldas 520 AM Controller:
The setting range is 1 to 1000kp/rev, so i believe we should be OK with type OSE105 then.:)

This gets better and better...:):) I will definitively try to re-program my OSE 253's now!
I have no ABS battery module and is used to always do home-search on start-up anyway, so I will go for OSE...

So it is doable with a custom drive cable, a USB-RS422 adapter (like Exsys EX-1309-T) and a laptop with Linux on it?
One question though: The OSE253 has a resolution of 25 000p/rev while OSE104 has...

OK If I have OSE253 now, I better chose the OSE104 and none of the "S" versions so I dont run into a physical misfit issue.
Regarding "reprogramming": Wow that would be really neat, being able to...

MrMetric:
I checked the encoder cable buildups for both mds-a-svj/mds-b-svj2 drives and mds-b-v/mds-c1-v drives and they all seam to have same pinouts so I am not too worried about that.

dm17ry:...

Thanks for the valuable information. I think it is weird though. Can anyone confirm, elaborate on why C1-V2 drives does not accept OSE 253 encoders?
Another odd thing is that the servo monitor...

Hi everybody,
Long time no see...

I have a problem starting my second 4-axis Meldas 520AM (1998) system since I changed all drives to MDS-C1.
I get S01 PR 0018 Alarm and the contactor shut off...

Hi Steve,
Just a Little friendly hint:
You should supply much more background info, ideally pictures of your CNC panel, PC screen shots etc..... That way we are much more able to help you.
...

I had also a very noisy Y-axis last year. It turned out to be a faulty servo driver (amp). It has worked perfect since I changed the driver.

You will find my thread about it here....

I will take a closer look at it, but I think that the arm comes in too quickly, before the spindle even reach oriented position. Or the spindle overshoots the point and get hit by the arm. Maybe i...

OK, today I have been playing a little with spindle parameters.
Now it orients more often than not. There are however occations when it doesn't.

I changed to the yellow ones, the old ones can be...

Dear slamet,

There is little chance that your need will be seen as you have rised your question in a thread adressing "Trouble with Spindle Orientation".

You will most likely receive more...

I also saw a note in the Instruction Manual on page App.1-116, that SP125 should have 1/2 of SP124 value.

Look below for my present parameters. It is a bit mixed up for FV-800A, don't you think?...

Thanks a lot for the info...

Caprirs,
The parameters you mention must be SP005, SP006 and SP007 and they are all mentioned in Girish' PDF as well.

Girish,
Both my machines have spindles...

Run into a new problem with my ”new” Feeler / Meldas 520AM VMC:

When I have the machine in Manual mode and I want to orient the spindle (rotate it to the tool change position), most of the times...

On my other Feeler I do all machining by dripfeeding from a PC.
I always use 19.2 KBaud Baud and it works really well.

Will try dripfeeding the new Feeler soon, maybe tomorrow evening.

I only...

Success!:cheers:

Today I set up communication between the PC and CNC again, now with the Exsys RS232 Optical Isolator in between.

It really cuts all galvanic connections and worked like a...

The shield is not wired to any D-sub pin. It is only grounded to chassis frame very near the CNC control in the cabinet.

As the setup of the new machine is more or less similar to my other working Feeler, I bit the bullet and bought an RS 232 Optical Isolator:
http://www.exsys.ch/download/catalog/ex_47925.pdf
I will...

Follow this thread to get Mitsubishi Manuals:

http://www.cnczone.com/forums/mazak_mitsubishi_mazatrol/90282-maintenance_manuals_mitsubishi_contro-2.html#post1054135

A1CNC,

Re. your 4:th axis plans:
Meldas 520 AM is already prepared for a 4:th axis = "B" axis.

You need to get a servo amplifier (drive) MDS-A-SVJ-06 or MDS-B-SVJ2-06 and a 4:th axis rotating...

A1CNC,

So the laptop worked with both machines when not plugged into the wall? Then, when you plugged it into the wall, one of the machines got hot wire due to ground issue? Which wire got hot and...

I sure hope it's not the board.

One interesting thing, I found out yesterday, talking to the previous owner:

When he connected his laptop, trying to output the parameters etc., he encountered...

Thanks Caprirs,

I take it that you mean measuring voltage between the D-sub connectors metal frame and the PC's or CNC's frame ground?

I will check the "new" CNC first as it is when my PC +...

Hi all Meldas friends!

I recently bought another Feeler FV-800A with 4:th axis and Meldas 520AMR control. The annoying thing is that the RS 232 does not seem to work on this one. The setup and...