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We have four diesel generators that supply both "hotel power" at 440v, and a short time 600v for a large motor that we need to start occasionally.
The 600v is obtained by over-exciting the generator with an additional 48vdc for a short time (typically 6 seconds). After which, the generator goes back to supplying the normal 440vac.
As mentioned, each of the four generators do their jobs independently. Each has a "hotel load" and a short time motor start load. Three of the four generators are working correctly with the 600vac short-time output.
This is the issue, we have one generator that has recently seen a need to increase the 6 second over-excitation to 12 seconds. I'm at a loss as to why we need to double the excitation time.
Anyone familiar with this problem?
Thanks in advance.
The 600v is obtained by over-exciting the generator with an additional 48vdc for a short time (typically 6 seconds). After which, the generator goes back to supplying the normal 440vac.
As mentioned, each of the four generators do their jobs independently. Each has a "hotel load" and a short time motor start load. Three of the four generators are working correctly with the 600vac short-time output.
This is the issue, we have one generator that has recently seen a need to increase the 6 second over-excitation to 12 seconds. I'm at a loss as to why we need to double the excitation time.
Anyone familiar with this problem?
Thanks in advance.