Recent content by wired1

Ohmboy: the protocol can bought by anybody who wants to produce compatible products, although AB may their own version which may have proprietary components to it. see http://www.odva.org

I'll try anything at this point . . . By the way, its for my company - not me.

I don't believe SDS and DeviceNET are compatible in either their signal levels or physical media. While not having worked with SDS, I found that I could make large deviations in the physical media of DeviceNET and it still worked. Don't expect to get the same speed or distance if you use a...

I understand your point of view. We want to do overload and rupture current levels that will call for 8 to 10 thousand amps, however. Also, the kva is a factor - 300. The static mfrs. hesitate when I give them those numbers.

I'm in the market for a 400hz m-g set. Anybody know any good sources? The intended use is for in a testlab.

The ASD looks like an eddy current clutch. I had some limited experience with this type of drive on a long conveyor that was driven by two motors. the clutch helped balance the motors to eliminate any surging as they reacted to the varying load. As far as I know, a VFD can handle any control...

if the inertia of the motor is used as a baseline, then the ratio serves as a convenient way to gauge the ability of the system to respond to changes (ie. ability to accelerate within a reasonable time). i have seen this ratio advocated by other manufacturers but i believe to be a rule-of-thumb...

Note that the use of diodes or suppressors on dc relays is considered mandatory enough that some manufacturers design them into the relay.

A tip on file size. look for software that will let you save images in .tif or .gif format. these take a lot less space. i think the above mentioned photo editor can do it. (never save images as .bmp - that's the worst on file size)

This sounds like a technique also known as "bang-bang" (on-off) control; commonly used to control a resistive heater. It is used on electric valve actuators - ac and dc both. The bang-bang controller is a PIC chip that "bumps" the motor while a feedback pot monitors the...

BradJ To your previous question what NEC calls a device that produces an arc in normal operation, is precisely as you have surmised, a switch. Sounds like lawyer-speak, but think about it - pushbuttons, relays, dc motors with their commutators, all fall into this category.

I have used Eurotherm controls to do this. The 2416 is a popular one. But any of the instrument companies would have a product that would do it.

my comments follow: -resolution: With a stepper or a servo, it will be possible to achieve the resolution but the accuracy will be difficult. Will the mechanical system be able to hold to the .5 arcsecond level? -digital encoder: How is the system set up/aligned/reset? If a one-time-only...

I think the 100 rpm parameter was given as a minspeed to minimize the effects of cogging or “torque ripple” from the motor. You might ask the source of that info to give his basis for it. Maybe he thinks your app requires a low speed performance level that it really doesn’t. I would think...

PUMPDESIGNER Years ago, I used a lot of Turck for Industrial Control applications. They had a good reputation and were a favorite choice. Later, they became partnered with Banner, and perhaps a different management philosophy has prevailed. I definitely agree with CHDean that they need to...