Alarm 122 and 176 at Power up

[hrhoward]

Hello,
I have a problem with a HAAS VF-0E. We just got this machine in last week (used).
I have run 240 vac to the main cb. and tapped the transformer accordingly. When power on the machine I will get the following alarms:
Alarm 122 Overheating of regen
Alarm 176 Over Heat Shutdown

Then it will shutdown in 30 seconds.

Where should I start looking?

Thanks,

Heath

[rlabonte18]

there is a small transformer up by your main breaker that is dual voltage you may have to change that one also.

[hrhoward]

Originally Posted by rlabonte18 there is a small transformer up by your main breaker that is dual voltage you may have to change that one also.

rlabonte18,
Thanks for the reply. I know the transformer you are talking about. I have about 241 vac on the primary side and 28 vac on the two red wires on the secondary. Is that within the limits or is it to high?

[Geof]

Have you checked the buss voltage? Go to the Diagnostics screen and page down once or twice; it should be between 320 and 340 DC.

If the voltage is correct it is possible the regen circuit is faulty and the regen resistor is in the circuit all the time. I believe there is a relay that closes when the buss voltage gets above a certain value during braking of the spindle. If this relay sticks closed the DC buss is dumping power into the regen resistor all the time.

[Haas__man]

What is the year of manufacture of your machine?

[hrhoward]

Originally Posted by Geof Have you checked the buss voltage? Go to the Diagnostics screen and page down once or twice; it should be between 320 and 340 DC. If the voltage is correct it is possible the regen circuit is faulty and the regen resistor is in the circuit all the time. I believe there is a relay that closes when the buss voltage gets above a certain value during braking of the spindle. If this relay sticks closed the DC buss is dumping power into the regen resistor all the time.

Geof, I have 340 VDC. What you describe about the regen circuit, could this happen during start-up? I have felt around the resistors on top of the control box and I have never felt any warmth coming off of them.

Originally Posted by Haas__man What is the year of manufacture of your machine?

Haas__man,
It was manufactured in Feb. of 1998.

[Haas__man]

Ok, if the regens do not feel warm then I would suggest that you probably just have a loose wire - or maybe there is a problem with parameters.
Loose wire -
Open the electrical cabinet door (turn off machine)
Look at bottom left of cabinet
this is I/O pcb
Look down the laft hand side and you should see lots of small brown plugs
most of these should be labelled up
One of these should be labelled up 'regen' or ' regen overheat' something like that
Just basically check they are all plugged in
Double check by unplugging each one and plugging back in to make sure it's not just a loose connection.
Then at right hand side of cabinet should be a white box with vector drive printed on it. (This is still live up to half an hour after machine is turned off so beware)
You are again looking for a small brown plugnear the bottom left of the unit. Again check to see if it is plugged in, and unplug and plug it back in.

Parameters.
It could just be a parameter that is set wrong. Let me know what software version you have ( probably around 9.40n).
Then look at parameters.
You are looking for one that reads 'Overtemp nc' it will be either a '1' or a '0'. You will find it in either paramter 57 or parameter 209.
Let me know what this value is.
Thanks

[hrhoward]

Haas__man,

I checked the plugs on the I/O board, unplugged and plugged them back.
I also did the same on the Vector drive.

I have softward version 9.58 n.

I found an "Over T is NC 1" in the parameter list.

Also, the contacts K1 and K4 are energized.

[Haas__man]

Ok,
That parameter is set correctly.
If you go in to diagnostics (parameter button twice)
What do you see?
you should see two columns of descriptions and number '1's and '0's.
Are they all '1's or all '0's or just random? One of them should probably be flashing from a 1 to a zero constantly (red beacon)

Turn machine off and open electrical cabinet.
On the i/o pcb again (bottom left of cabinet)
you will see four small ribbon cables
one near top left
one near top right,
one near bottom left
one near bottom right
I think there is also another one that is a larger ribbon cable too.
Same as before, unplug each one and plug back in
you will see a small plastic lever on each side of the socket these are used to remove the plug only, to plug cable back in just push until the levers click back in.

These cables go up to the MOCON pcb which is located at top left of cabinet.
Remove the cover at top left of cabinet
you will then be able to see the mocon pcb
Top left of the mocon is the large ribbon cable, top right are the four ribbon cables again.
unplug these in turn and plug back in.
Then refit cover (and ground cables)
Turn on machine to see if fault has gone.
Thanks

[hrhoward]

Haas__man,

Thanks, I will give that a try this morning after my coffee infusion takes effect.

[JoBwan]

I'm getting excited to see what the fix actuall is!!

[hrhoward]

I will check out what Haas__man suggested on Wednesday. Have a couple things I have to work on before I get back to the Haas.