I made a 600V RPC to power my 575V paper weight of a mill. It's struggling to start the mill motor when it's not in the mill (i.e. not connected to the transmission and the spindle).
Actually, I'm using a 0.25 hp motor to start the idler. I also need to keep this 0.25 motor running if I want to start the mechanically disconnected mill motor (my load motor). otherwise the whole RPC slow down and stop. Once the load motor is up to speed, I can stop the 0.25hp motor and every thing run correctly.
However, when I put the motor back in the mill, I can do the same to get the spindle rotate a bit, but the breaker jump before the mill get up to speed. After a some thinking, I came to the conclusion that I would need more power to start the mill. I think a few start capacitor would help. Which lead me here.
I need a starting circuit for the RPC. A standard Steveco potential relay won't do it since my circuit is 600V. I can find a bunch of 600V contactor, I just need a way to open the circuit after 1 or 2 sec to avoir damaging the start capacitor. I've looked a bit around, and there really isn't any magic box that do it for you at this voltage. Can anyone help with that?
Actually, I'm using a 0.25 hp motor to start the idler. I also need to keep this 0.25 motor running if I want to start the mechanically disconnected mill motor (my load motor). otherwise the whole RPC slow down and stop. Once the load motor is up to speed, I can stop the 0.25hp motor and every thing run correctly.
However, when I put the motor back in the mill, I can do the same to get the spindle rotate a bit, but the breaker jump before the mill get up to speed. After a some thinking, I came to the conclusion that I would need more power to start the mill. I think a few start capacitor would help. Which lead me here.
I need a starting circuit for the RPC. A standard Steveco potential relay won't do it since my circuit is 600V. I can find a bunch of 600V contactor, I just need a way to open the circuit after 1 or 2 sec to avoir damaging the start capacitor. I've looked a bit around, and there really isn't any magic box that do it for you at this voltage. Can anyone help with that?