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Hi edison Awesome! I'm looking forward to running the system now and seeing how well we did for estimates and calculations. Thanks again all!

Sorry the formatting in my data table got messed up. the table above is just showing the 3 speeds i will operate at and for how long. The bottom line is all points are below the available HP of the motor and only the middle one is close. If i encounter some unforseen mechanical losses i could...

Thanks gr8blu i forgot to grab a set of DWGs the last time i was onsite so i am not sure what temperature monitoring devices are available. if i was to guess i would say the machine has never been rewound and therefore as you say there are probably only thermostats. Looking the cowern papers as...

Thanks again edison I'll get another look at the motor next week. I suspect i only have motor thermals to alert me of a winding overtemperature but now that you bring it up i will look to see if there are RTDs or thermistors imbedded in the windings.

Thanks Waross I am reading the RMS HP loading now and this is EXACTLY what I am facing. Long blocks of time well below overload and then seconds long events that may be just above overload.

Hi Edison Thanks for the reply. The motor is 1960's vintage GE. It is a tank of a motor. The DC drive was factory set to limit the current at 110% of nameplate current. My hope is i can leave that where it is and just limit the overload duration to not hit the trip point. I do not know the...

Does overloading a DC motor result in drawing more than nameplate amps? My customer is going to operate a DC motor at or slightly above the HP curve at a given RPM. From motor nameplate, 995A 452V, 600HP, 1300RPM. Customer needs 224HP at the load (after a gearbox of unknown efficiency) at...

Thanks for the reply. I have requested a recommendation from several of the terminal block companies like WAGO, AB and Phoenix Contact just to see what their ideas are.

by spec i must supply surge protection for each individual PLC input in my panel. These devices are all of the voltage free (dry contact type) where the 120VAC will be supplied by my panel. i found a WAGO MOV to ground terminal block and i believe this is the appropriate device to comply with...

I am designing a PLC control panel for a train tunnel ventilation system. I am mandated to provide my panel with power from 2 small UPSs that will be powered by presumably separately derived systems. I have a design that can keep the UPS power separated for most components but I will need to...