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Responding to query: Presuming load is proportional to motor torque, and as long as you have ability to monitor current and voltage, then I suggest you install an input power monitor. Then, motor output power, hence load can be determined directly, without inference. Output of power...

Responding to Stephen Wright's query: In my experience faster response from a solenoid required that it be overdriven with a higher than nominal voltage. The use of higher insulation class (higher temperature) was the usual solution. Another solution is to overdrive, and then cutback to the...

Responding to Alan's request: 1) What is current requirement @ 600 Vdc? 2) What is coil voltage? 3) What are you controlling? Solenoid? Motor? Other? Regards, Phil Corso, PE Trip-A-Larm Corp

Responding to Lance Guillory's request: It is highly unlikely you will find a DC/DC converter suitable for installation in a classified area. You will probably have to mount it in an x-proof enclosure. Use "switcher"-type with highest efficiency to minimize power loss thereby minimizing...

Check with Marrotta Valve Corp in Boonton, NJ(?). They had a nomagraph. Unfortunately, I don't have any other information regarding their existence. Regards, Phil Corso, PE Trip-A-Larm Corp

To List, Following is a correction to my Mar 15, 2000, 4:34pm E-mail on the subject. The last sentence, should have read: "... of one has a 60º (not 90º) phase-shift with respect to the other. Regards, Phil Corso, PE Trip-A-Larm Corp

Responding to David's reply: The application data is insufficient to go into a detailed discussion on welder design. That is, DC vs AC, arc in air or inert gas blanket, etc. That said, if a three phase source is used the DC voltage never goes "thru" zero. Hence, the currrent will not...

For Malau Monkee (CB): The circuit you desire appeared in Jan '98 issue of "Electronics Now" magazine. It is entitled "Speed Control". It uses the 555 to generate a PWM signal and several MOSFET's in parallel to reach motor's current requirement. MOSFET's can be cross connected for...

There is no signicant difference if you mean frequency CONverter rather that INverter. Regards, Phil Corso, PE Trip-A-Larm Corp

To List members: In answer to those requesting additional information on the article referenced in my Feb 22 Email "To E-Stop or not to E-stop" The article entitled "e-stop" was authored by: Tim Park, Product Manager Electronic Brakes Division TB Wood's Inc. Chambersburg, PA His...

Trevor, The major problem with speed control of fractional-Hp single-phase AC motors is not the "chopping" action of the controller resulting in premature degradation of insulation. Instead, it is the fact that the motor has no starting torque. Various designs produce starting torque, but...

Michael, start with dictionary definition of "emergency". Then embellish with definitions from IEEE Std 100-1992 "The IEEE Standard Dictionary of Electrical and Electronics terms". Phil Corso, PE Trip-A-Larm Corp

For a well thought out answer to the infamous question "To E-Stop or not to E-Stop": See Tim Park's timely article in the Feb-2000 issue of PTdesign Magazine. He has an excellent grasp of the intent of the E-stop function. Tim is with TB Wood's Inc. Phil Corso, PE Trip-A-Larm Corp

Further to my earlier responses n the subject: To Evan Martin, I apologize for not getting your name correctly. Also, please do not take my response as a putdown. It's a "gray hair" thing. To Shawn Hinchey, If it will help, and you are still interested, I can send you solution(s) in...

Martin, your perception of the Gray code is analogous to stating that Einstein's Theory of Relativity led to the equation E=MC^1.999+. Give Dr. Gray (I never met the man) credit for being a major contributor in the development of commutator codes. They are often referred to as cyclical...

Responding to Shawn Hinchys query: Are you looking for the four Boolean equations relating the complete cyclical Gray code [W,X,Y,Z] to the 16-Digit Binary Coded Decimal [A,B,C,D]? Or to just the 10-digit decimal? Phil Corso, PE Trip-A-Larm Corp

If unable to find software, you might consider the "old fashioned" Karnaugh mapping method for converting a cyclical-code to BCD or vice versa. Phil Corso, PE Trip-A-Larm Corp.

To those requesting a copy: Please send a self-addressed envelope (large) with postage to cover about a 1/2-pound (250-gram) document. If you want it sooner, send UPS, FEDEX, or DHL account number, and I will ship it as "Collect / 3rd Party Billing". Phil Corso, PE Trip-A-Larm Corp >A...

A key factor in Water Level and Boiler Feed Water control is the size of the steam and mud drums. If too small they can thwart attempts to effectively control drum level. Years ago I participated in a study conducted to mathematically relate drum size to drum level transients caused by sudden...

Contacts that might be useful: ROHM COMPANY, LTD PANASONIC MURATA ERIE Phil Corso, PE Trip-A-Larm Corp