Hitachi Seiki TF20 Help ! ! Please

[scott1980]

Hi , this is my first post on this site so i apologise if it is a bit long winded.

C.N.C machining is relatively new to me , i have only got 4 ish years or experience and only 3 on this machine. All three without problem . Until now...

Could any of you guys please help me with a hitachi seiki lathe type TF20 with Fanuc series 21-T controls ? The problem started when a part came free from the chuck whilst being machined. This has happened numerous times , all without serious consequence . This time however , after hitting the emergency stop button , i noticed a torque alarm , i didnt note the number as it cleared too quickly! I then moved the turret clear of the jaws and tried to zero return the machine as usual , but at the end of the Z return cycle , it stops and shows

506 over travel +X

It does the X axis first as normal without problem , but near the end of the Z cycle the alarm triggers , showing an overtravel on X. Strange?
506 is the hardware overtravel , but the limit switch is not hit by the dog.
Also there is an external alarm , 1005 , for which there is no reference in the alarm list in fanucs manual , and i do not have the maintenance volume of the seiki literature.

I have tried to remedy this by the P and cancel buttons on power up , but this does not work , nor does adjusting the x or z axis with the 1850 grid shift parameter , the machine just halts at the end of z zero.

Should i be able to set the reference point by software or is it necessary to adjust the ball screw ( a procedure i know next to nothing about!)


Thanks in advice people , any help would be , well , really helpfull !!
Great site by the way.
Cheers

[chop5280]

The Hitachi Seiki I ran had a clutch that would pop out in case of a crash. It is really easy to pop back in place once you know where it is at. There is one on both the x and z axis. If you are unfamiliar with the clutch and need help locating it let me know.
Good Luck

[scott1980]

I managed to sort the overtravel out ! ! At last. I used the grid shift page , but this time , contrary to what the manual says , I powered down immediately after changing the value . Previously I was inputting a value , disabling the parameter write enable , then powering down then back up. Anyhow its back up and running now , with only a few minor changes to the offsets to be made.

[dantkale.dinesh]

hello,

I am having Hitachi Seiki TF20 with FANUC 21T controller similar machine now I lost PMC parameters,

If you send me the PMC parameter it will be great help to me.

I tried with MTB but I found poor response from them.

Please help me,

thanks

[mnucad]

Here is the parameters for your Hitachi Seiki TF20 with FANUC 21T.

NOW, We have the same Hitachi Seiki TF20 with FANUC 21T control and WE NEED THE LADDER BACKUP FILE, because we have ROM Initialize troubles and we can not start the lathe.

I just attached the 4 files we have but we need the LADDER file.

It seems like must be 5 files for this backup, 21nc, 21off, 21pmc, 21pro but our technician says LADDER FILE IS MISSING. HEEEEELP US PLEASE...!!!

[jasacnc]

I dear sir, please can you help on a backup of parameter´s?

please we need a copy of parameter´s and pmc parameters.

besr regards in advance
please use my direct e-mail

suporte@jasacnc.com