Recent content by MWO

Retired from a plant in Texas built in the late 70s that was a copy of a plant in the UK. Analyzers were designated as Q-xxxx as yours. That being said Towers were all E-xxxx, vessels were F-xxxx, heat exchangers were C-xxxx and rotating equipment was J-xxxx. The Q for quality made sense but the...

Sounds to me like you might need an interposing relay and a contactor. The interposing relay would need a 12 volt coil and a normally closed contact that will open when the float switch closes. The contacts of the interposing relay need to be able to handle the voltage and current of the...

I guess I’m not familiar with the term “POSITIVE” coil verses the seal in. I usually see the P as a pulse contact which closes for 1 scan of the LD If you only want the motor to run while you are holding the switch, I don’t see where any parallel contact would be needed. My concern with the...

Something you might want to think about is how is the motor stopped if the limit switch fails. What if one side stops mid travel and the other keeps going. Just some things to think about when designing a circuit. Have fun.

I would make the limits Close on actuation. I would program a NO contact from the motor drive coil in parallel with the a NO contact from the PB. This parallel combo would be in series with a NC from the limit at the end of the drive. This series/parallel combo would be what picks up the drive...

I also have a spreadsheet i have built which allows you to define the 40C curve and the 63C curve below the 0.85 PF corresponding to my example curves I gave you. The spreadsheet treats this curve as part of the segment of a circle and does the analytical geometry for you to define the center...

You cant keep the pf and MW constant while changing the Mvars. If you look at the supplied capability curve you will see the pf lines are linear. The pf is the ratio of the real power to the apparent power. The tangent of the arccosine of pf is the ratio of the of the Mvars /Mwatts. In other...

Are you asking simply how to read the curve? If so........ looking at the attached curve you find you Megawatts on the X-Axis (for example 25) . Draw a line up until you reach the cooling air temperature (40C in this example). Draw a line to the left (green in this example) to the to the Y axis...

I see now that is a meter with an led light. Not familiar with it. I looked up the meter on the internet but didnt see any thing that I would feel comfortable telling you what to do. It seems to be rated 60-380 VAC. I would assume you would apply your 230 v to them but I'm not sure. Good luck...

Technically not the only option but probably the best in your case. (Best I can tell from your pictures). The same current flows through both the red and black source wires so your blue wire (solo wire connected to the red) should work.

It should work. You just need to parallel the outputs being careful about the polarity markings and orientation of the CTs (with regards to polarity) so the currents will sum properly.

Oh I see now you said they wouldnt be operated in parallel. Never mind.

Just a question on my part. Wouldnt you have to be operated them independently in order to sync them together or is it possible to build the two generators so they would always be synchronized. The rotors would have to be built in the exact same position so the generated sine wave would always...

Best article I have seen with the answers to your question. https://www.elprocus.com/what-is-a-distance-relay-working-its-applications/

JeffersonAirplane …. I mean what happen to the current, to the electrons, how do they move in the new circuit causing a decreased need of electrons themselves generated by the source? ========================================================= Its all about timing. The inductive load of the motor...