[motorway]

Hi, We have a 1997 VF0E with brushless motors. For the past 6 months it has been giving intermittent #160 Low Voltage Alarms(and other wierd alarms like X servo overheat when the machine was not doing anything, spindle drive fault) they would clear immediately though.
About 3 weeks ago the alarm returned and would not clear.
Input Voltage is right.
In diagnostic page Buss Voltage said 10v. (needs to be 325v)
After doing some reading on here and calling haas we came to the conclusion it was the Mocon Board, so, bought a used one off ebay, moved over the original mocon ROM chip to the new board, installed it worked fine for around 2 weeks.

Same alarm came back last week, would not clear.
Bought another used mocon board off ebay, but no luck, did no make alarm go away. (still 10v on diag. page too)

We are having issues with our dealer, claming we owe them money for parts from 2 years ago when buy everything COD...anyways
does anybody have suggestions?
Could it be the vector drive?
the haas tech said on the phone it could be a battery on the CPU board?

Any help is greatly appreciated.

[vf1kf]

Sounds like your VFD, search vector drive on this site for a ton of info.

[BigNizzy]

MY money would be on the vector drive. They are rubbish.

Another option would be the low voltage power supply.

[motorway]

I did some searching on here, I measured the voltage at the vector drive between screws 2 & 3 and got 340 V.
Measured voltage on P17 cable (Voltage Mon. on Mocon board) and got 3.31V.
Heres something funny, the diagnostics page says 10V but with P17 at mocon unplugged, it said 116V and has been climbing now at 138V.

i would think the vector drive was junk too, but swapping the mocon boards the first time fixed it, and the vector drive is reading the right voltage with a meter.

[motorway]

I think i figured it out, i wiggled around the multi wire connectors in the vector drive, and it went back to 350V!
hopefully that was the problem