And for those of us who work around VFD motors all day, you gotta love having the same screaching sound coming from our rsg's. I have a treadmill motor as well. I was going to use that, when Bart offered a VFD and motor on the list a while back. My treadmill motor is rated at 1 Hp with 90 vdc scr control, and 1.25 Hp with 120 vdc PWM control.
I like that I can set a min frequency and a max frequency with the VFD, making the pot more or less sensitive. I also like the fact that I can run the motor to 150 Hz. Since we push all of other components, why not push the motor as well. The drive will do up to 500 Hz, but I'm not sure I want to push the motor that far, yet.
While I'm still using "relay logic", I do have the drive run status as a permissive before I can pull in my main contactor. There were times on my old coil and controller when I forgot to spin up the rsg motor, before applying power to the coil. This eliminates that. It also will drop power if I get any VFD fault.
Adam
--- On Wed, 7/9/08, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
From: bartb <bartb@xxxxxxxxxxxxxxxx>
Subject: Re: [TCML] July 4th and why not to be in a hurry
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Wednesday, July 9, 2008, 11:56 PM
Hi David,
I figured you were doing something like that with the motor
(due to
statements of 300+ bps). Sure, a DC motor will do just
fine. What type
of HP is the motor (if you know)? As Adam so well listed,
there are a
lot of bells and whistles. If we wanted, the potentiometer
can be put
away and a 16 position switch could be used to run at 16
different
predefined speeds. I did this early on, but didn't like
it. The pot and
ability to vary the bps make a difference in control. If
your using
variable speeds, I know you realize this as well (I have no
doubt).
Take care,
Bart
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