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

Drew -

I use an Hitachi L100 VFD without dynamic braking on my Bridgeport, and it
actually stops the spindle quickly enough. Even though it doesn't provide
"dynamic" braking, it does have a controlled deceleration (programmable)
that stops faster than just opening the circuit. I've been very pleased
with it. I only use the spindle brake to lock the spindle during tool
changes.

I use the mill's original switch to change direction, but ONLY after it has
stopped fully. Haven't had any problems. The VFD is pretty well protected,
and if you try reversing the spindle speed via this switch before the VFD
has completed its deceleration curve, it will go into "fault" mode, which is
easy to reset.

Good luck.

Carlos Guillermo
VERVE Engineering & Design

PS:

By the way, I just mounted the VFD on a plate with a 1-phase 220V cord to
the AC outlet, and a 3-phase outlet on the plate, so that I could easily
switch it between my mill and lathe.



-----Original Message-----
From: drew@... [mailto:drew@...]
Sent: Thursday, March 01, 2001 11:20 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Quick RF-45/VFD question


Hi everyone,

We're just getting ready to cut a P.O. for a Rong Fu RF-45 mill
and I need to pick somekind of a phase converter/VFD for it.
One question which comes ups is whether the RF-45 has a handbrake
on the spindle or not. Can anyone of guys out there check their
machine for me? If the machine doesn't have a handbrake then I
can get a Hitachi SJ100 VFD which includes dynamic braking.

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

--
Drew Rogge
drew@...

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