Real 3 phase vs 3phase rotary converter?
I'm running a Bridgeport Series II Interact 4 and have had this problem off and on over the past year. Sometimes I can't even get the ready lite and then sometimes it comes on and I can start the machine , but during a cycle run the machine spindle will shut down. this has the Contraves controller, which from what I understand will shut the spindle down if it see a fluctuation in the voltage for more than a few seconds. I have had the spindle DC motor rebuilt and have upgraded the phase converter from a 3 HP to a used 15HP which was with the machine. I also upgraded my electrical service to 200 amp and the machine has been running very good since doing that in march of this year. When I did the electrical upgrade the guy from the electric company stated that the power in my area was pretty bad and flucuate quite a bit.
Now my question: since about the end of May the machine started acting up again with the same problem. I can upgrade to real 3 phase power and this will cost close to $1000 or I can purchase a Temco 11 KW rotary phase converter for about $1050 + shipping. My spindle requir4es at least 8.8KW as it is a 7HP motor. Need options on the best way to proceed. Real or a good phase converter that will regulate the voltage.
Thanks,
Ben
I'm not a electrical guy...
As I understand the phase generators only one leg is artificially generated. We have for example L1 and L2 coming directly in as normal. Each of those 120v from your 220 v single phase coming ‘IN’. Coming out, you are getting the normal L1, L2, and a leg generated by the phase device, L3 (in this example). This particular generated leg is subject to the voltage dropping more severely then the ”natural” legs under the high loads of say the spindle starting in high range and or servos moving fast.
In my case, the leg that was artificially generated (L3) just so happened to be the leg that was wired to support the transformer (dropping the 120v down to the 5v) for the computer. With a heavy start up load on the spindle and or servo, L3 voltage would drop so much the transformer (120v in and 5 v out)… the 5 v would drop voltage severely enough to momentarily make the computer flicker and the machine would lose track of what it was doing and stop.
Anyone out there that can explain this better than me please speak up I not an electronic guy, I’m just repeating what I was told.
So…what I was told to do was… switch that L3 generated leg off of the computer and use one of the other legs to run it.
Your phase generator schematic may show which ”L” leg is generated mine did.