Pool Main Pump Motor: Difference between revisions
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==== Emergency Stop ==== | ==== Emergency Stop ==== | ||
=== Drive Unit === | |||
==== Configuration ==== | |||
* Use Variable Torque (VT) mode for pump control (power is proportional to the cube of the speed). | |||
==== Alternatives Evaluated ==== | |||
Automation Direct GS4-2015: | |||
* Substantially larger: 12.60" L x 7.48" W x 7.48" D (versus 8.15" L x 4.29" W x 6.06" D for the GS3). | |||
* Support for 1-phase operation (not needed for this application). | |||
* Slightly reduced CT/VT ratings: 47A/49A vs. 49A/51A for the GS3. | |||
* Slightly worse low temperature rating: -10 °C vs. -20 °C for the GS3 (not an issue). | |||
* No FOC or torque control mode? | |||
* No USB port? | |||
* Slightly more/better analog/digital I/O options vs. the GS3 (not needed for this application). | |||
* Might not be compatible with permanent magnet AC motors? | |||
Others: | |||
* ABB ACS310-03U-50A8-2: Larger, expensive ($1,100). | |||
=== Line Reactor === | === Line Reactor === | ||
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[[File:FFSC-005 Pg 7 - VFD Panel Reactor Placement Study.png|300px]] | [[File:FFSC-005 Pg 7 - VFD Panel Reactor Placement Study.png|300px]] | ||
[[File:FFSC-005 Pg 10 - Main Pump Motor VFD.png|300px]] | [[File:FFSC-005 Pg 10 - Main Pump Motor VFD.png|300px]] | ||
=== Bill of Materials === | === Bill of Materials === | ||
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<b>Not Included:</b> DIN rail, terminals, small fuse terminal(s), control wire, etc. | <b>Not Included:</b> DIN rail, terminals, small fuse terminal(s), control wire, etc. | ||
=== Motor Cable === | === Motor Cable === | ||
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 (August 2021 pricing). 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. | 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 (August 2021 pricing). 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. | ||
== Prior Modifications Evaluated == | == Prior Modifications Evaluated == | ||