Re: [CAD_CAM_EDM_DRO] Re: Quick RF-45/VFD question

Drew,

Wire up the switch to control only the low voltage "control inputs" on the
VFD. (This means your drum switch or push buttons should have tiny 18 gauge
control wires.) This will enable the VFD to slow down and then restart in
reverse if you change directions while running. This will not hurt a properly
programmed VFD. I do this with both Yaskawa/Magnetecs and AC Tech units.

Becareful with the motor on the RF-45. Mine was marked as a 3 phase but
had a 1 phase motor installed. It took me a while to trace and verify the
motor was 1 phase as they had the motor hooked to a 3 phase drum switch. Good
thing I did not power it up. I hate fire drills.

Peter
THRD, Inc.


<< I am pretty sure my VFD manual specifically said not to put any
switches between the motor and drive. For a surplus seller of VFDs
try http://www.dealerselectric.com . No relationship, satisfied
customer etc. Andy

> Second question is if anyone out there using a VFD still uses
> the power switch on the mill to switch/reverse the power to the
> motor. According to the nice tech at AutomationDirect I could
> rewire the switch on the mill to control one of the inputs on
> the VFD to accomplish the same thing but I don't know if I want
> to start tearing into the mill right at the start :-)
>
> Thanks,
> Drew
>