Pool Main Pump Motor: Difference between revisions
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→Variable Frequency Drive (VFD)
Matt Parnell (talk | contribs) |
Matt Parnell (talk | contribs) |
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A major issue/question remains to be answered: Can any VFD reliably operate with high-leg delta service as is present at the club? | A major issue/question remains to be answered: Can any VFD reliably operate with high-leg delta service as is present at the club? | ||
=== Safety === | === Safety === | ||
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=== Wiring === | === Wiring === | ||
Shielded VFD cabling may be required to contain high-frequency emissions. Automation Direct has #8 AWG 4-conductor XLPE insulated shielded cable, rated for 50 A at 75 °C (NEC 310.15 (B), assumes 30 °C ambient) for $8.08/ft. The cable is made in USA by Southwire. This cable has an OD of 0.87 inches and minimum bend radius of 10 inches. Calculations suggest a 1-1/4" conduit may be necessary to pull a cable of this diameter with adequate fill margin. The existing PVC conduit appears to be about 3/4" (to confirm), which would need to be replaced. | |||
A load reactor likely will not be used, nor does it necessarily eliminate the need for shielded VFD cabling. | |||
=== Configuration === | |||
Subject to further review: | |||
* Variable Torque (VT) for pump control (power is proportional to the cube of the speed) | |||
==== DURApulse GS23-2015 ==== | |||
* For 75% load at 50 °C, no de-rating is necessary up to xx kHz. | |||