Could you provide more information about the header configuration? This has a significant Are the pumps connected to a single pipe (size?) at different points (How far apart?) or does each have a line meeting at some common point? What is the flow & pressure ranges? With a little more...
Do you have a hydrostatic tank in the system? That & very slow acting controls should lessen the problem with pressure waves.
Will there be any communications between pump controls? You'll probably need to use a combination of pressure & total flow in order to match the number of pumps to the...
electricpete,
Has phase A cap been replace or removed? I have seen people bend lugs to get the conductor out of the way while replacing equipment. That could weaken the lug at just the point where it failed.
Chances are the 500A CB is designed to serve only as a local disconnect switch at the MCC. The 400A CB serves as the overcurrent protection for the 500 kCM feeder. The idea being that the 400A CB would trip before the 500A CB. Of course for most faults, both CBs will trip.
I have seen older...
Multiple pumps on a single drive was fairly back in the days drives cost an arm & a leg. The drive is set up with output contacts and interlock to switch between the 2 motors and uses closed transition transfer to accross the line after reaching full speed.
They normally would not use open...
The cost differences are not so much is actual power used, but in the cost of installation. Do you have sufficient 2.4kV and 480V power close to the motor location? Will the a transformer be required for one or both voltages? You should determine what is required for each voltage, calculate...
Speed of wound rotor motors is usually controlled by resistor banks, liquid reostats or energy recovery systems. I believe that you are looking for a solidstate energy recovery system that converts the rotor current and injects it back into the power system. A number of these system were...
