[capital]

We have a yang machining center with a fanuc omd control. It has a forth axis(rotary table). We can get the forth axis to turn manually and independantly(in a program) however, we cannot seem to get it to rotate simultaneously with any other axis. Is this a parameter issue or what. Also we occasionally get a 444 error that is not in the manual what is it?

[ChattaMan]

Sounds like you have an indexer not a 4th axis. You have not given enough info to work on.

Part prog sample would help.
In the prog, is it moved independantly by an M code or a A axis command?
Is the 4th axis programmed separately on it's own control panel?
What make/model is the 4th axis.
Does your 444 error appear on your Fanuc control or 4th axis control?

[avtechmachine]

I have to agree with ChattaMan, your 4th Axis popery is a Indexer instead?

[capital]

The 444 error appears on the fanuc control. In the program the forth axis is moved independantly by a B command which I assume is the same as an A command.

[avtechmachine]

Ref. to Fanuc Maintenance manual servo alarm section, you need to check DGN number 720 to 727 to see which bit number is equal 1
make sure to check DGN not parameter

Ahn Vuong
[email protected]

[avtechmachine]

also need to check on the servo drive inside of the electrical cabinet to see any alarm number displace

Ahn Vuong
[email protected]

[hrh]

If alarm 444 then this is a proper 4th axis integrated in the machine.
Check Diagnostic 723 when the alarm appears as well as alarm indications on the 4th axis servo amp.

The option for simultaneous 4-axes interpolation and or cylindrical interpolation is required for the 4th axis to move together with the other three axes.

Usually a M-code is required to release the brake before moving the 4th axis.
You should then command a M-code again to lock the brake when the cutting force on the steel component is high.
Therefore check if the 4th axis unit has sufficient air for releasing the brake and that the pneumatic valve is operating as well when commanding clamp or unclamp.

[avtechmachine]

"Usually a M-code is required to release the brake before moving the 4th axis.
You should then command a M-code again to lock the brake when the cutting force on the steel component is high.
Therefore check if the 4th axis unit has sufficient air for releasing the brake and that the pneumatic valve is operating as well when commanding clamp or unclamp. "

Just in case if you need to know the M code for clamp & unclamp for this VMC, they are M10 and M11

Ahn Vuong

[capital]

How do I find out if I have the option for 4-axes interpolation installed?

[hrh]

Parameter 914 bit 7 = 4th axis interface
(Control should then have parameters from 8400 to 8499)

Parameter 907 bit 2 = Simultaneous 3 axes control
Parameter 913 bit 4 = Simultaneous 4 axes control
Parameter 917 bit 0 = Cylindrical interpolation

bit# 7654321
bit# 0000000

BACK UP THE CONTROL's DATA BEFORE ATTEMPTING ANY ADJUSTMENTS.

[capital]

DGN 723.5 on when alarm 444 what does that tell me

[mopar499]

shouldn't the bits be?

76543210

[mopar499]

Parameter 914 bit 7 is on.
Parameter 907 =01011000
Parameter 913 =10100000
Parameter 917 =00000010
this is how they are now before we change them can someone verify they need changed?

Yes we are using the M code in the progam for the brake.
The air valves are working, air pressure is good.

The encoder on the rotary table when using the hand has a faint swell and when running in a program it gets loader before the alarm.

DGN 723.5 we think is a voltage problem, maybe the encoder. How can we check that?

[avtechmachine]

going by Fanuc manual DGN 723 bit 5 = 1 mean overcurrent alarm is being generated inside of digital servo.
did you check any alarm indication on servo?
if the servo has no alarm you should check the power cable from servo to 4th Axis table

Ahn Vuong

[hrh]

capital

Sorry, I made a mistake with the bit layout. Thanks Mopar.

bit# 76543210
bit# 00000000

Current settings
Parameter 907 =01011000
Parameter 913 =10100000
Parameter 917 =00000010

New settings:
Parameter 907 =01011100
Parameter 913 =10110000
Parameter 917 =00000011

Just confirm that DGN 723 the bit is #5 and not perhaps bit#4 due to my incorrect explanation.

bit#5 00100000
bit#4 00010000

Bit#5 :OVC. You can check the motor current percentage on the servo tuning screen..
Press MDI key DGNS / PARAM
Press the [SV SET] Softkey(below the screen)
Press [SV TUN]
Page down until you can see the A-axis (or is it B-axis?) page.
Watch the current% while you rotate the 4th axis by the handwheel.
If at some point the current exceeds +150% for more than 2sec, alarm 444 will come up.

You may have to determine if the fault might be mechanical and that could involve removing the motor from the 4th axis unit and then running the motor without mechanical load.

If the above mechanical probability does not suffice, let me know the 4th axis motor spec and the servo amp spec.

[capital]

We tried changing the parameters as suggested however, we could not get parameter
907 to be 01011100 it defaults back to 010011000. The 913 and 917 parameters were accepted. Now the 4th axis will not move at all. It will only move manually. We still have 3 axes simultanious movement but not four.

[hrh]

Please check the control unit type:
FS-0MC? A02B-0098-B511
FS-0MD? A02B-0099-B544
FS-0 Mate C? A02B-0100-B501

It might be possible that you have a FS-0MD or FS-0 Mate C. These controls are restricted to Simultaneous 3 axes interpolation by software. Sorry again.

Restore parameters 913 and 917 to original and check if the 4th axis works in MDI or AUTO/MEMORY mode.

[capital]

it is a Fanuc Series O-MD however the model number is A61L-0001-0093 is this a newer model of the same POS as the FS-OMD A02B-0099-B544 and it only has 3 axis simultaneous control so, the forth axis is a glorified indexer?????

[capital]

sorry that was dumb that apparently is only the monitor model number

[mopar499]

Thank you hrh.

We have the FS-0MD? A02B-0099-B544 control unit.

So does that meen the fourth axis will not run with X or Y?

Do we have any other options?