KMB1m VFD Upgrade

Keep the static converter and use it to start the idler motor of a rotary phase converter. I wouldn't anticipate any CNC problems from a rotary if you obtain an idler motor of at least 2 x the HP rating of the Hurco. See rotary phase converter in metalwebnews.com.

phase converter. =A0I

motor of at least 2 x the

I already have a 10hp capacity rotary phase converter, but I don't really want to run 3 phase service and a control circuit for the phase converter over to where the mill is located, in any case I won a 5hp

1phase in to 3 phase out ABB VFD on Ebay which is en route. So the the VFD will get used, it's just a question of if I pull off the variable speed belt drive from the mill. Mainly would do this to get auto speed control via the ABB's A/D input from the Hurco's Servo board.

phase converter. I

motor of at least 2 x the

Install the VFD and leave the variable speed sheaves in place - at least until the drive belt wears out and you have to replace it anyway. If your mill is anything like our Wells-Index, the job of replacing the belt is quite a challenge.

You'll probably never use the reduction gears again since the VFD will give torque controlled speeds down to a crawl.

The ramp-up and ramp-down speeds and dwell times on reversing are adjustable from the VFD. If this is your first VFD conversion, you'll be amazed...

Carla "The English language doesn't just borrow words from other languages. It follows them down dark alleys, hits them over the head with old beer bottles and rummages through their pockets for loose grammar."

oldjag sez:

"I already have a 10hp capacity rotary phase converter, but I don't really want to run 3 phase service and a control circuit for the phase converter over to where the mill is located . . . ."

I have no direct experience with VFDs but I do feel entitled to an opinion re. RPCs. If you have a

10 HP idler RPC, appropriately "voltage balanced" and use it to run a 3 HP Hurco, then you should have no problems with voltage sag, or etc. Didn't you say it presenly runs ok from a static phase converter? Remember, you can run more than 1 machine from a RPC, but only 1 at a time from a VFD.

Bob Swinney

phase converter. I

motor of at least 2 x

in any case I won a 5hp

1phase in to 3 phase out ABB VFD on Ebay which is en route. So the the VFD will get used, it's just a question of if I pull off the variable speed belt drive from the mill. Mainly would do this to get auto speed control via the ABB's A/D input from the Hurco's Servo board.

n re. RPCs. =A0If you have a

P Hurco, then you should

runs ok from a static phase

only 1 at a time from a VFD.

ry phase converter. I

er motor of at least 2 x

The 10 hp phase converter runs a Leblond Lathe, a Bridgeport, a bandsaw and a delt/disc sander so it's pretty well utilized now. The static phase converter in the Hurco I'll probably get rid of or may use it with a 13" Clausing late, but I'm not sure it will work with the Clausings 2 speed motor.