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My company makes several lines of equipment for use in the pharma industry. We use mainly AB logix5000 processor and have employed a modular style of programming for several years now which allows us to plug and play different modules depending on what options the individual machines have. We...

Is anyone aware of any good seminars / courses dealing with CE marking industrial equipment? Would like to learn more about this subject and what exactly is required - the more detail the better. I am in PA - something local is best but I'll look at anything at this point. Thanks.

At my company, the issue of wire gauge has been bothering me for some time. Our machines range from some that are 120v powered, a few dc drives (fractional HP) to others that are 230 or 480v supplied with VFDs but again all less than 1HP. At issue is the apparent NFPA 79 rule that all motor...

I'm not actually challenging ampacity of conductors - we're talking about whether or not we really need 14awg wire (15amp ampacity) for a motor that draws less than 0.25 amps. That's the extreme but this is what I'm getting at. I'll copy the post to IEEE as well. Thanks.

At my company, the issue of wire gauge has been bothering me for some time. Our machines range from some that are 120v powered, a few dc drives (fractional HP) to others that are 230 or 480v supplied with VFDs but again all less than 1HP. At issue is the apparent NFPA 79 rule that all motor...

Thanks for the input guys. I did get in touch with the mfg and am told that they normally are OK with a 1/20 speed reduction from nominal but that the 1/17 that this application represents could be considered "on the edge" and may cause problems. Changing the gearmotor to a larger reduction is...

I've got a 90Vdc 1/8hp gearmotor (Dayton 4z383) that has an output speed of 30rpm. I have an application that would require me to run it as slow as 2 rpm - so I'd be applying only about 6 volts to it. I believe that there is a problem with running dc motors too slow and overheating them - how...

Is it acceptable to rivet nameplates to the side of an electrical enclosure when trying to maintain NEMA 12 or NEMA 4/4X ratings? Does anyone know of a good practical reference to best practices when striving to maintain these ratings? Thanks.

Thanks jraef, I do plan to incorporate the relevant sections of nfpa79, ul508, etc but am looking more for "good practice" guidance that isn't necessarily controlled by the official standards. Any thoughts on that?

I am heading up an effort to write a standards package for my company to incorporate best practice techniques related to electrical / programming design for industrial equipment. I'm planning to include as much as possible starting with fusing and panel layout and going all the way through HMI...

I am heading up an effort to write a standards package for my company to incorporate best practice techniques related to electrical / programming design for industrial equipment. I'm planning to include as much as possible starting with fusing and panel layout and going all the way through HMI...

Anyone have a good reference (electronic or book) that details the specific requirements for an electrical installation to be classified Nema 12, Nema 4, and Nema 4x. I work for a company that is an OEM of pkg equipment and could use a good reference for these situations. Including allowable...

I have a need for a precision (less than 10 arc-min) gearbox for a servo for an upcoming test that I want to do. Ideally the gearbox would be between 40:1 and 60:1. Since it is only a test, I'd like to pick one up cheap somewhere relatively fast. Does anyone know of any good sources for...

I have an application for a small linear actuator and could use some help finding the right product - please let me know if you have any recommendations: Move (at max stroke): index up 2", short dwell, index down 2" Total time for fastest move: 80mS Total weight being moved: 1-2 pounds Stroke...

Has anyone ever used Marathon motors? I have not ever used them but they have a smaller/cheaper 1/3hp inverter duty motor than other major manufacturers...let me know if you have any positive or negative feedback. thanks.

this particular application is 120v. Occasionally 230v or 480v applications come up as well.

I have an application where we need to put a few ac motors on a small machine. The motors are 3/4hp and will be speed controlled with a vfd. The size of the inverter duty motors is a big concern as the machine is pretty small. Is there a chance that inverter duty motors are really not needed...

Has anyone used Yaskawa's Sigma II on DeviceNet yet? I have found AB's Ultra 100 to be clumsy on DeviceNet. There are a number of steps to perform to change a simple parameter such as speed, accel/decel, etc. I would appreciate any comments from those of you who have tried the Sigma II.

What influences the speed of ethernet?  I hooked up two computers for file transfer using a simple peer to peer connection with 2 10Mb/s ethernet cards.  The file transfer was no faster than using a serial cable and communicating at 115200bps.  Is ethernet...

I've recently built a machine that requires one stepper axis, has approx. 10 inputs and 12 outputs, and a display with at least 4 lines. The temporary solution was to use a maple systems interface with a compumotor zeta 6104 single axis stepper drive and an Allen Bradley micrologix PLC. This...