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View Poll Results: Which may be best suitable method ?
Switch on both motors at light load before switchover 1 7.69%
Run second motor from second source and then bring it to VFD control after switchover 1 7.69%
Not possible without interrupting load 1 7.69%
Using two VFD is inevitable 10 76.92%
Providing electrical and mechanical interlock and smooth switchover possible 2 15.38%
Multiple Choice Poll. Voters: 13. You may not vote on this poll

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Old May 19th, 2017, 10:24 AM   #16
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The problem would be that the VFD already present is rugged with complicated speed control signals from station and it is more complicated to duplicate another VFD with the same .
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Old May 19th, 2017, 02:28 PM   #17
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Provide an output manifold pressure intensifier at nominal system pressure, with the capacity to supply the system for the interval of time required to Stop VFD with Motor #1-> Switch VFD Load Side to Motor #2 -> Start VFD with Motor #2.

The pressure intensifier will be 'throttled' via proportional flow control valve with close loop feedback from an output manifold pressure transducer; I believe you should be able to execute a pretty smooth transfer from Pump #1 Pressure to Intensifier Pressure and then back to Pump #2 Pressure after the VFD switchover.
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Old May 19th, 2017, 03:39 PM   #18
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Originally Posted by View Post
No, two pumps running on two motors supplying through valves to single column
This sounds like you are planning to run two pumps at the same time in parallel. For this to work, you need to have both pump putting out the same amount of head. This is usually done by running two of the same model of pump running at the same speed. This calls for 2 VFDs.
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