Pool Main Pump Motor: Difference between revisions
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In the future, a VFD may be used to reduce the motor speed, eliminating the need for manual adjustment via a valve. | In the future, a VFD may be used to reduce the motor speed, eliminating the need for manual adjustment via a valve. | ||
== Wiring and Fuse Protection == | == Wiring and Fuse Protection == | ||
| Line 235: | Line 153: | ||
Applying a 5 kVAr PFCC would reduce the FLA from 37 A to 31 A. This would reduce i-squared-R losses by 6 A. Actual losses are then based upon the cable run. | Applying a 5 kVAr PFCC would reduce the FLA from 37 A to 31 A. This would reduce i-squared-R losses by 6 A. Actual losses are then based upon the cable run. | ||
== Appendix == | |||
=== Measurement Data === | |||
Measurements made on a Fluke 322 meter in September 2021: | |||
{| class="wikitable" | |||
!L1 to GND | |||
|117 VAC | |||
|- | |||
!L2 to GND | |||
|211 VAC | |||
|- | |||
!L3 to GND | |||
|120 VAC | |||
|} | |||
{| class="wikitable" | |||
!L1 to L2 | |||
|240 VAC | |||
|- | |||
!L2 to L3 | |||
|240 VAC | |||
|- | |||
!L3 to L1 | |||
|238 VAC | |||
|} | |||
{| class="wikitable" | |||
! | |||
!Trial #1 | |||
!Trial #2 | |||
!Trial #3 | |||
!Trial #4 | |||
|- | |||
!L1 | |||
|34.3 A | |||
|35.2 A | |||
|27.8 A | |||
|32.5 A | |||
|- | |||
!L2 | |||
|35.5 A | |||
|36.0 A | |||
|29.2 A | |||
|33.6 A | |||
|- | |||
!L3 | |||
|32.2 A | |||
|33.2 A | |||
|26.2 A | |||
|30.4 A | |||
|- | |||
!Tank Pressures | |||
|9-10 psi | |||
|11-12 psi | |||
|0-1 psi | |||
|5-6 psi | |||
|- | |||
!Flow Rate | |||
|617 GPM | |||
|694 GPM | |||
|248 GPM | |||
|476 GPM | |||
|- | |||
!Total Power<br>(See Note 1) | |||
|14.133 kVA | |||
|14.466 kVA | |||
|11.529 kVA | |||
|13.371 kVA | |||
|} | |||
* <b>Trial #1:</b> The output flow valve is cut back to just shy of 45° (half closed). The input flow valve is fully open. | |||
* <b>Trial #2:</b> The output and input flow valves are fully open. | |||
* <b>Trial #3:</b> The output flow valve is cut back far (very restricted). The input flow valve is fully open. | |||
* <b>Trial #4:</b> The output flow valve is fully open. The input flow valve is very restricted. | |||
<b>Notes:</b> | |||
* <b>Note 1:</b> The total power calculation is based on the average current of all three phases, multiplied by 240 V, multiplied by the square root of 3. | |||
* The power factor (PF) according to the motor plate is 0.81, but it's not known how this applies to the particular loads in each trial. | |||