I bought a motor I thought was a simple, new, 3-phase, 1700rpm motor for my mill. When I finally convinced the guy to mail it I got what looks like a 2-speed, 2 or 4 pole motor with this baseplate:
It's going on my mill to replace the single-phase 1.5hp 1750 rpm motor currently there. I just ordered another VFD so I've got at least until Thursday/Friday before I can wire it up.
I'll be bypassing the on/off and reverse switches currently on the mill and just using the on/off switch on the VFD to power it. I do have a 5-step pulley to provide variable speed and I know I can turn the knob on the VFD to increase/decrease it a bit. My lathe runs off a VFD though, and I find myself switching speeds via the gear levers, never via the VFD knob.
So should I wire it at 1700 or 3400? I know carbide likes higher speeds, but all my tooling is HSS. I work mainly in simple steel, occasionally in brass, next to never in aluminum. I've read a half-dozen other threads in other forums on these motors and some of them say that if I wire it at 1700 I'll get the slower speed, but also less torque. I don't want to wire it for 1700 and find out I've just converted a 2hp motor into a 3/4hp motor, but I don't want to wire it for 3500 and find I have to dial it down to next to zero at the VFD because otherwise it's too fast.
thanks
Joe
It's going on my mill to replace the single-phase 1.5hp 1750 rpm motor currently there. I just ordered another VFD so I've got at least until Thursday/Friday before I can wire it up.
I'll be bypassing the on/off and reverse switches currently on the mill and just using the on/off switch on the VFD to power it. I do have a 5-step pulley to provide variable speed and I know I can turn the knob on the VFD to increase/decrease it a bit. My lathe runs off a VFD though, and I find myself switching speeds via the gear levers, never via the VFD knob.
So should I wire it at 1700 or 3400? I know carbide likes higher speeds, but all my tooling is HSS. I work mainly in simple steel, occasionally in brass, next to never in aluminum. I've read a half-dozen other threads in other forums on these motors and some of them say that if I wire it at 1700 I'll get the slower speed, but also less torque. I don't want to wire it for 1700 and find out I've just converted a 2hp motor into a 3/4hp motor, but I don't want to wire it for 3500 and find I have to dial it down to next to zero at the VFD because otherwise it's too fast.
thanks
Joe