So I have been a bit puzzled by lack of performance on an old Haas VF1 vertical with 10 HP spindle (shocking I know) and I am wondering if it is just the mill (VFD) or an issue with my rotary phase converter setup. Essentially, I have come close to stalling the spindle when roughing aluminum on not that crazy of cuts. I am finding roughly a a calculated 4 HP cut is running my machine up to 45% load at 7500 RPM (maxxed out). If I start to push past 50% load the spindle will stop keeping up and will lose RPM. I was running last night while doing a roughing routine and walked over to my RPC which shows the voltage on the generated leg. Getting into one of those heavy cuts I am seeing the the wild to line voltage drop from 240V to 228V approximately. That seemed excessive to me.
Next step is to use a meter to monitor current and voltage at the machine but I am am worried the phase imbalance showing as a voltage change is robbing me of horsepower or I have some other problem causing a 10 hp spindle to only be a 4 hp spindle.
My Setup:
North America Phase Converter Co. CP-20 panel (20 HP, 48 amps max, 25 continuous)
Magnetek Century E-Plus E457 20HP 230/460V 3-Phase Type MOGB AC Motor 1745RPM idler motor
100 amp breakers from line panel to CP-20
30 amp breakers from panel after CP-20 to machine.
I have never had issues with breakers tripping but don't tip need to run high loads for a long time as it is a small machine.
Next step is to use a meter to monitor current and voltage at the machine but I am am worried the phase imbalance showing as a voltage change is robbing me of horsepower or I have some other problem causing a 10 hp spindle to only be a 4 hp spindle.
My Setup:
North America Phase Converter Co. CP-20 panel (20 HP, 48 amps max, 25 continuous)
Magnetek Century E-Plus E457 20HP 230/460V 3-Phase Type MOGB AC Motor 1745RPM idler motor
100 amp breakers from line panel to CP-20
30 amp breakers from panel after CP-20 to machine.
I have never had issues with breakers tripping but don't tip need to run high loads for a long time as it is a small machine.