Thread: Remote control of the HUANYANG VFD

Originally Posted by WCD

Hi Mike,

The Chipmaster actually has a two-position lever on the headstock that selects either the geared (low speed) range or direct drive (the high speed range). The Kopp variator (as originally fitted) provides stepless speed adjustment within either range. Compared with the Kopp variator, a VFD would indeed give less torque at the lower speeds within each speed range, and a reduced range of usable speeds. The Kopp is good for 9:1, and with the two speed options in the headstock the Chipmaster's speed range of 35-3000rpm.

Cheers,
Bill

This is why I've not ditched the variator from mine. You need to install a countershaft with a 2:1 ratio to get the torque multiplication you'll lose by running a VFD at low frequencies. OK this isn't the end of the world having a belt to shift every so often but it's still a PITA if the variator works well enough.

One day maybe I'll do it but it'll be with a 5HP motor if I can get one to fit in the space. Or I'll just buy a 10EE.

PDW

power not torque

Originally Posted by WCD

Hi Mike,

The Chipmaster actually has a two-position lever on the headstock that selects either the geared (low speed) range or direct drive (the high speed range). The Kopp variator (as originally fitted) provides stepless speed adjustment within either range. Compared with the Kopp variator, a VFD would indeed give less torque at the lower speeds within each speed range, and a reduced range of usable speeds. The Kopp is good for 9:1, and with the two speed options in the headstock the Chipmaster's speed range of 35-3000rpm.

Cheers,
Bill

With my Chipmaster, I found the loss of torque with a 1440rpm (4 pole) motor below 50hz to be a problem. I have recenlty replaced it with a larger, 6 pole (960) rpm motor, overdriven up to 75hz, whcih is much better.