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If all you are after is to check if it is working may I suggest that you leave it all connected and simply use a good quality digital multimeter on Hz between either the 24+ and pulse output or the Pulse output and ground. Depending on what exactly you are after you can get some moderately...

What about the cable from the VFD to the Pumps? Is it VFD grade cable or is standard submersible cable being used for the run to the pumps? Not sure exactly how these effects work, in fact no idea at all, but I have seen 100KW supply fans with VFD's not reach speed due to problems with cable...

cgrodzinski have you ever tried installing this size cable yourself? I am an Engineer from a Trade background so have had the pleasure of trying to install cables that have been sized with no thought of the site particulars. This is a short run coming from a transformer to an MCC if 1000mm2...

Thanks for that it is what i was after. I have spent days looking up shut down monitoring and all sorts of things like that I never thought of trip circuit supervision. Mark

Hi all, I have an issue with design of an emergency shutdown circuit that can be monitored for open circuit and short circuit. Normally i would do this using UV trip coils but in this instance it is required that i use a NDE (normally De Energized) circuit as a failure of the shut down circuit...

Easy way to determine if it is the SCR is to Re assign it to one of the mud pumps or draw works motors and assign a known good SCR to the top drive. If the problem persists then it has to be a top drive problem.