Evening everyone.
Just got a VF2 ss unlocked today in the garage. Power going to it is provided by 50 amp single phase > safety disconnect > PT355 > VF2ss.
My issue is when we go to ramp the spindle up we get a low AC input alarm and the machine immediately dies. If we rapid the machine around with the spindle turning (low rpm, or high rpm we slowly ramped to), coolant on, and auger on we can get the pendant to say low ac, rapids reduced to 75%.
Single phase into the converter is :232 volts
Outputs from the converter with the machine at idle, no load are :t1, t2: 232v. t1, t3: 236v. t2, t3: 232v (t3 is the generated leg)
When we test the voltage outputs from the converter (at the time of spindle ramp up) we get t1, t2: 226v. t1, t3: 204v. t2, t3: 181v.
We are running the machine on the 243 - 227 V transformer taps in the machine. The next set of taps down are 226 - 211 V.
I called Phase technologies and they suggested we add something after the phase converter that will add inductance to all the legs so they don't see as quick of a voltage drop on spindle ramp ups. It's going to run me an additional $750. My concern is that won't really fix my problem. The only reason I'm running such an expensive converter is people here and on other forums highly recommended them for my exact application. I find it strange that I don't see this issue pop up with everyone else running this converter.
I was thinking that maybe I could try running machine on the lower transformer taps. My concern is getting overvolting issues. I figure over volting is worse than under volting. My current input power would work for those taps because it's within Haas's recommended within 10% input power. It all changes when the spindle ramps up though. How bad for the machine is it to just give a try?
Has anyone else run into this issue? I really don't see much talk about this issue so I was hoping someone could help me out. Hopefully it helps the next person as well who runs into this issue.
Just got a VF2 ss unlocked today in the garage. Power going to it is provided by 50 amp single phase > safety disconnect > PT355 > VF2ss.
My issue is when we go to ramp the spindle up we get a low AC input alarm and the machine immediately dies. If we rapid the machine around with the spindle turning (low rpm, or high rpm we slowly ramped to), coolant on, and auger on we can get the pendant to say low ac, rapids reduced to 75%.
Single phase into the converter is :232 volts
Outputs from the converter with the machine at idle, no load are :t1, t2: 232v. t1, t3: 236v. t2, t3: 232v (t3 is the generated leg)
When we test the voltage outputs from the converter (at the time of spindle ramp up) we get t1, t2: 226v. t1, t3: 204v. t2, t3: 181v.
We are running the machine on the 243 - 227 V transformer taps in the machine. The next set of taps down are 226 - 211 V.
I called Phase technologies and they suggested we add something after the phase converter that will add inductance to all the legs so they don't see as quick of a voltage drop on spindle ramp ups. It's going to run me an additional $750. My concern is that won't really fix my problem. The only reason I'm running such an expensive converter is people here and on other forums highly recommended them for my exact application. I find it strange that I don't see this issue pop up with everyone else running this converter.
I was thinking that maybe I could try running machine on the lower transformer taps. My concern is getting overvolting issues. I figure over volting is worse than under volting. My current input power would work for those taps because it's within Haas's recommended within 10% input power. It all changes when the spindle ramps up though. How bad for the machine is it to just give a try?
Has anyone else run into this issue? I really don't see much talk about this issue so I was hoping someone could help me out. Hopefully it helps the next person as well who runs into this issue.