FANUC 6TB does not start up

[StefanL38]

Hello,

I have a Hitachi Seiki Lathe Type 3NE with a FANUC 6 TB control.
The display says system 6T series 992 Vers. 07
(see attached picture "version.jpg"))

The maschine does not start up.
Even before the screen displays something the red LED "Alarm Motor" on the frontpanel lights up.

I have no idea what I have to check for analysing this problem.
Any hints are greatly apreciated.

thank you very much in advance

Stefan

[lyfordln]

check for 3 phase, be sure all legs are approximately equal.
check to see if spindle fan is ok
check fuses in control cabinet

[StefanL38]

Thank you very much for your first tips. I will do that and come back with new information.

best regards

Stefan

[Al_The_Man]

Look at the input unit LED's and also check the power supply, 5v & 24vdc, you may have to remove each 24v conductor in turn to see if the power supply comes up, a load such as a shorted limit switch can cause it.
Al.

[StefanL38]

Hello,

I've been busy with other things for a longer time.

What I have checked so far is that the 3 phases are OK.

Somehow I feel like a real newbee about the electric of a CNC-control. Especially about where to find what inside of the control.

I have taken pictures of the control-cabinet of the FANUC 6T
Can somebody point me through the pictures where I have to check for:

- "input-unit LEDs"
- and "fuses in the control cabinet"

As the display comes up and shows the message "not ready"
I assume that the 5V and 24V are OK

Or is it possible that the display can show the message "not ready" and some 5V or 24V supplying is down?

Where in the cabinet do I find the "24V conductors"?

I guess these are pretty basic questions. But if a want to take the long journey to make the machine run again these are my first steps.

Thank you very much in advance for your patience with me and help.
All kinds of hints where to look or to take additional pictures to clear things up are very appreciated.

best regards

Stefan

[gridley51]

I would suspect a machine fault rather than a control fault.All my 6T`s show the not ready screen until the machine start button is pressed.Some machines have a start button and some it`s done by the control.Check none of the overloads on the contactors have tripped.Other reasons for the not ready screen are spindle and axis drive faults.
Mark.

[Al_The_Man]

The last photo is the P.S., there is also a small unit with 2 leds on and a relay, called an input unit, this checks that the PS is OK at power up, if not it shuts the power off, The green LED should be on.
If it is a short on the 24v or 5v output and not the supply itself, one way is to remove the conductors one at a time on the terminals R.H. side of the P.S.
IIRC the 24v are at the top and 5v at the bottom.
Some times it is a short on the 24vdc to a limit switch etc.
First measure the 24v and 5v to see if it is present.
Al.

[StefanL38]

Hello Mark,

thank you very much for replying so fast. As english is not my native language
(I'm german) I want to check if I understand right.

If I press the start button nothing happens.

Does contactors mean these BIG relays that are able to switch high currents?
and please excuse the basic questions - where do I find these contactors?

How can I examine the spindle and axisdrives for faults?
Maybe at first you can point me to the right chapter or keywords in the manual?

best regards

Stefan

[gridley51]

Originally Posted by Al_The_Man The last photo is the P.S., there is also a small unit with 2 leds on and a relay, called an input unit, this checks that the PS is OK at power up, if not it shuts the power off, The green LED should be on. If it is a short on the 24v or 5v output and not the supply itself, one way is to remove the conductors one at a time on the terminals R.H. side of the P.S. IIRC the 24v are at the top and 5v at the bottom. Some times it is a short on the 24vdc to a limit switch etc. First measure the 24v and 5v to see if it is present. Al.

Al,if the PS or 24vdc is getting pulled down the screen does not come up.I have that fault on a machine with a 6T.Every year at so at switch on nothing happens,no screen nothing.It`s a short on the machine side,proved by unplugging cables from the connections board.I have never yet found the fault despite spending days at it.It`s a large lathe and digging about in the wiring seems to move whatever is shorting and it powers up.
Mark.

[gridley51]

Stefan,is the usual start up procedure to push the start button?
If so,you need to look for a fault on the e-stop line.
That can be caused by different faults.Usually by an overload tripping or a fuse blowing.In one of the pictures you posted it shows magnetic contacters.Next to these you can see the overloads,they have a small dial and a red button.With the power of,press all the red buttons you can see and check all the fuses.
Do you understand electrical drawings and can you use a multimeter?
Mark.

[StefanL38]

Hello Mark,
Hello Al,

thank you very much for your help so far.
Maybe some day I can help if you would like to do something
with the microcontroller called "Propeller" from Parallax Inc.

Yes I understand electrical and electronical schematics well.
I would call myself a hobbyist-EE in the field of small transistors, OpAmps and TTL-chips and I know very well how to measure voltages and currents.

But I'm a bloody newbee about this CNC-control and high power electronics.

If you would mention something like "the big IGBT on the left" I would not know how it looks like.

I want to make a suggestion: as english is not my native language
and I'm not familiar with technical terms in english. If you use them for the first time can you please use the technical term and add a short description
in easy to understand words?

Example: The "PS" (the 24V and 5V powersupply)

With "PS" do you mean 24V and 5V powersupply?

mark you mentioned "magnetic contacters". from what you explained about it yet I conclude "magnetic contacter" means a BIG relay that can switch really high currents? Is this correct?

But I have no idea what "overload" means in this case. Does it mean overload-protection? I attached a picture with red, green and yellow frames and text. Just to make sure that I understand right.

I understand what you mean with
"With the power of,press all the red buttons"

What does happen if I push the red buttons?

How do I "see and check all the fuses".

Simply by pulling then out and measure resistance beeing 0,1 Ohm or endless?

Are there any other fuses to check? Are they already shown on one of the pictures? Or would it be good to make some additional pictures?


@al: in the second attached picture I have drawn red and green frames
red frame: do you mean this part as "input-unit"? There is a green LED in the red frame and this LED is on.

green frame: I measured the voltages both 5V and 24V are present.
(so forget about the questionsmarks in the picture)

about the limit-switches I have to ask my friend who is the mechanical specialist about the machine.

There is another detail that might be important: on the front panel are
some red LEDs. The LED "Motor-Alarm" is light up. So what do I heave to check if this is the case?


Thank you very much in advance for answering

best regards

Stefan

[gridley51]

Originally Posted by StefanL38 mark you mentioned "magnetic contacters". from what you explained about it yet I conclude "magnetic contacter" means a BIG relay that can switch really high currents? Is this correct? But I have no idea what "overload" means in this case. Does it mean overload-protection? I attached a picture with red, green and yellow frames and text. Just to make sure that I understand right. I understand what you mean with "With the power of,press all the red buttons" What does happen if I push the red buttons? There is another detail that might be important: on the front panel are some red LEDs. The LED "Motor-Alarm" is light up. So what do I heave to check if this is the case? Stefan

When you press red buttons it resets a contact which has opened.
I think you have found the problem with "Motor alarm led".The motor has tripped for some reason.It may reset,it may not.
Now press red buttons.
You can see red buttons in your post No5,bottom left picture.These are contactors in the picture and the bit with the button is an overload.Overload is a protection contact which senses the current going to the motor.If the current is excessive in one or more phases it opens a normally closed (NC) contact which opens the contactor (big power relay thing)
Are you connected to mains electricity?

Mark.