big denford triac problems

[mark35gun]

odd thing is the guy i bought it off had ran it for 11 years with no problems with this set up,
now here's the thing, he disconnected the cabling from the phase convertor to facilitate moving the m/c and marked up all cables and where they go, i was very careful to re wire exactly as marked, but if he has made a mistake................

[Chaz]

odd thing is the guy i bought it off had ran it for 11 years with no problems with this set up,
now here's the thing, he disconnected the cabling from the phase convertor to facilitate moving the m/c and marked up all cables and where they go, i was very careful to re wire exactly as marked, but if he has made a mistake................

So I've had a quick look at every Denford wiring diagram I can see. I dont see anything where the actual servo drives are actually connected to all 3 phases, they seem to take a single phase for input power. That said, yours might be different.

[mark35gun]

you may well be right, i need to source boards before any testing can begin, although i don't know if i dare turn on the m/c!

[mark35gun]

heres a pic not very good i know
BTW the phase convertor is a boost electrical engineering one rated at 8 hp, which i know is miles to big for the denford but it came with it

[Chaz]

heres a pic not very good i know
BTW the phase convertor is a boost electrical engineering one rated at 8 hp, which i know is miles to big for the denford but it came with it

Very different looking to mine. Are you able to identify and take pics of the servo drives themselves? The wiring to them will be of interest, so too any model numbers to review how they get powered (based on a specsheet).

[mark35gun]

z axis no A06B-6058-H003
X,Y combined AO6B-6058-H221
i will post some pics in a short while

[m_c]

The reason I was asking about the phase converter, was they can produce voltage spikes, but if it has been working with the converter previously, it's not likely to a be problem. Just to be sure, it's probably worth measuring the voltages to make sure they are roughly similar.

Looking at the photo of the cabinet, it looks like the machine takes 3phase plus neutral (I'm assuming the blue wire between the main power switch, and main earth cable is a neutral..).
Again with the phase converter powered up, I would check the voltages. Check the 3 combinations of the phases, then each phase to neutral, then compare neutral to earth. Phase to phase should be similar, then phase to neutral should be similar, however the artificial phase (the one generated by the rotary) will likely be higher, but shouldn't be excessively higher.
On a normal 3P+N setup, neutral to earth should be near zero volts, however depending on the phase converter, it may be floating near normal single phase voltage.