Peter,
> The 7I33 has limited output current capabilites so would need a buffer to
> drive your VFDs. Since there is such high input current I would use one
> buffer
> per VFD. Are these 0-10V + direction devices or +- 10V?
The drives can be setup either way for either +-10 or +10 with direction so
we have different options.
Paul
----- Original Message -----
From: "Peter C. Wallace" <p...@mesanet.com>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Sent: Sunday, March 21, 2010 12:08 PM
Subject: Re: [Emc-users] G52 and Fanuc conversion to EMC
> On Sun, 21 Mar 2010, Paul Keeton wrote:
>
>> Date: Sun, 21 Mar 2010 11:39:57 -0400
>> From: Paul Keeton <pkeet...@woh.rr.com>
>> Reply-To: "Enhanced Machine Controller (EMC)"
>> <emc-users@lists.sourceforge.net>
>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
>> Subject: Re: [Emc-users] G52 and Fanuc conversion to EMC
>>
>> Peter,
>>
>> I have a question about the the 7i33. The machine we are
>> discussing
>> has three 25 HP spindle motors operating on 3 separate VFD's. We have a
>> Italian control that was fitted onto a machine and it has a 100ma limit
>> on
>> its analog output. Each VFD requires a minimum of 70ma to run. We had to
>> put
>> a small phoenix contact amp on it to boost the analog signal to run all
>> three drives on that machine. The problem comes when you turn one spindle
>> off and only run on two. The RPM runs higher than it should due the
>> decreased load on the circuit. In other words the analog VREF increases
>> and
>> the two drives have to be retuned. We get around this by putting a blank
>> tool in the spindle and running all 3 wether they are cutting or not. Not
>> only is this a waste of energy it also puts unnecessary wear on the
>> unused
>> spindles bearings. What is the limit of the analog out on the 7i33
>> channels?
>> I can always use one out per spindle and that would completely solve the
>> issue. What is your take on this? One output or three? Anyone else feel
>> free
>> to jump in!
>>
>> Paul
> The 7I33 has limited output current capabilites so would need a buffer to
> drive your VFDs. Since there is such high input current I would use one
> buffer
> per VFD. Are these 0-10V + direction devices or +- 10V?
>
> if 0-10V + dir, I may a have a solution coming (a single isolated output
> spindle control with RS-422 PWM so it can be mounted near the VFD)
>
>
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
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