2 speed pump not working on low speed

[Robert McP]

I've got a 2 hp 2 speed pump motor (ao smith p/n 0-193990-07) that is controlled by a hayward pro logic PL-P-4 that won't run on low speed. It hums when trying to go to low speed. A sticker on the motor says it has a low speed mini switch. Does anyone know how the pro logic makes it go to low speed or any troubleshooting help?
Thanks,
Robert

 

[JamesW]

Motor type CXPM means Capacitor Start/Run on Low Speed, PSC on High Speed.

So, you should have a start capacitor in the back of the motor under the back cover and a dual run capacitor under the hump on top of the motor.

So, you basically have 3 capacitors.

Check the capacitors.

 

[JamesW]

Motor type CXCP has a start capacitor and a run capacitor for the low speed and a run capacitor for the high speed (permanent split capacitor (PSC)).

Three capacitors on one pump motor?

Century 2HP 2-speed motor CAT B2984 230VAC. The capacitor under the top cover is 35+10 uF (it has three terminals). I believe that is the run capacitor. The capacitor under the end cover is 189-227 uF (it has two terminals). I believe that is the start capacitor. I learned that the 35+10...

www.troublefreepool.com

Pump won't startup in low speed, even after replacing capacitor

Hey folks, I bought this pump (link) 2 years ago and have been running it in low speed. Recently, it started doing what's in this video on startup (hums for a few seconds and then nothing): I replaced the capacitor, but it's still doing the same thing. Works fine in high speed mode. The...

www.troublefreepool.com

Three capacitors on one pump motor?

Century 2HP 2-speed motor CAT B2984 230VAC. The capacitor under the top cover is 35+10 uF (it has three terminals). I believe that is the run capacitor. The capacitor under the end cover is 189-227 uF (it has two terminals). I believe that is the start capacitor. I learned that the 35+10...

www.troublefreepool.com

Jandy Stealth 2.0 starts- abruptly stops

I just came home to my pump starting and immediately shutting off. The impeller is not obstructed, so I have a feeling it may be a capacitor issue. I am about to test in that direction. Since Jandy has discontinued this version of the stealth pump - and I have had issues mounting with the lid...

www.troublefreepool.com

 

[JamesW]

The problem might be the start capacitor, run capacitor or maybe the centrifugal switch (Copper V).

The motor was made on the 77th day of 2011, which makes it almost 13 years old.

The windings might be bad, but it is probably a bad capacitor.

The motor label shows how the two speeds are switched.

The hayward automation uses two relays to select the speed.

How To Wire A 2-Speed 230V Motor to a Hayward Pro Logic System - INYOPools.com

How To Wire A 2-Speed Motor to a Hayward Pro Logic System

www.inyopools.com

 

[1poolman1]

I've got a 2 hp 2 speed pump motor (ao smith p/n 0-193990-07) that is controlled by a hayward pro logic PL-P-4 that won't run on low speed. It hums when trying to go to low speed. A sticker on the motor says it has a low speed mini switch. Does anyone know how the pro logic makes it go to low speed or any troubleshooting help?
Thanks,
Robert

ProLogic uses two relays, one sends power to the high-speed windings, the other to the low. If the motor is "humming" power is being sent. Thirteen year-old motor. Might be time for a new one.

 

[JamesW]

If the configuration has been messed up, you can potentially get power to both windings at the same time, but I think that that is probably unlikely.

The configuration needs to be set to two speed so that the automation only sends power to one relay at a time.

What is the software revision number?

What exact pump do you have?

Maybe it is time to consider switching to a variable speed pump?

Is the Filter configuration set to 2 speed pump?

Is there an option for Variable Speed Pump?

 

[1poolman1]

If the configuration has been messed up, you can potentially get power to both windings at the same time, but I think that that is probably unlikely.

The configuration needs to be set to two speed so that the automation only sends power to one relay at a time.

What is the software revision number?

What exact pump do you have?

Maybe it is time to consider switching to a variable speed pump?

Is the Filter configuration set to 2 speed pump?

Is there an option for Variable Speed Pump?

Send power to both sets of windings and, if you're fortunate, only the breaker will trip. Ask me how I know.

 

[Robert McP]

The Main software revision # is 4.30 and the Display software revision # is 3.12. The pump is a Zodiac FHPM2.0-2. It is set for a 2 speed pump and there is a variable pump option. The controller has a relay for filter pump and 2 aux relays. aux 1 controls the low speed and aux 2 was unused. I swapped the aux 1 and aux 2 relays to see if the aux 1 relay had failed, it made no difference which is what I expected since the motor sounds like it is getting power because it tries to start on low.
If I switch to a variable speed pump would I need to just change controller from 2 speed to variable and set the high and low speed percentages for it to work properly? Or would some wiring in the controller need to be changed?
Thanks,
Robert

 

[JamesW]

If I switch to a variable speed pump would I need to just change controller from 2 speed to variable and set the high and low speed percentages for it to work properly?

Correct.

ProLogic will not communicate with non-Hayward pumps.

The 2.7 HP TriStar is a good choice.




This pump can communicate with and be controlled by Hayward pool controls such as OmniLogic™, ProLogic®, ECommand® 4, OnCommand®, OmniHub, S3 Omni, and OmniPL.

Minimum software revision requirements: OmniLogic R1.0.0, ProLogic 3.00, OnCommand 1.00, E-Command 2.65, E-Command 4 2.80, AquaLogic 2.65, and AquaPlus 2.65.

To determine Hayward control software revision, consult the pool control installation manual or visit our website at: www.
haywardpool.com.

Connection wire must be rated for a minimum of 300V, and may be up to 500 feet in length.

Use removable 4-position terminal block connector for wiring connection to motor drive PCB, taking care to note the wire colors and corresponding numbers next to the connectors.

Terminal block must be installed with screws facing up to ensure proper connection

TriStar VS 950

TriStar® VS variable speed pool pumps are the most energy efficient on the market, according to EPA ENERGY STAR 3rd party testing data. Saving pool owners up to 90% on energy costs, they are specifically designed to replace most single speed pool pumps.

hayward.com

https://hayward.com/media/akeneo_connector/asset_files/I/S/IS3206VSP3_Rev_D_a78b.pdf

https://hayward.com/media/akeneo_connector/asset_files/t/r/tristarvs_IS32950VS_2caf.pdf

 

[JamesW]

Send power to both sets of windings and, if you're fortunate, only the breaker will trip. Ask me how I know.

How do you know?

 

[JamesW]

You do need to change the wiring in the box and you will need to add a 2 wire communication wire.

The two-speed pump uses 4 wires, which are three power wires and 1 ground wire.

The variable speed pump only uses two power wires with continuous power from the breaker and not from a relay.

 

[JamesW]

You can see that there are two wires from the breaker to the relay.

For a variable speed pump, you normally want to power the pump directly from the breaker.

If you are not comfortable working with electricity, you might need to have an electrician do the wiring.

How To Wire A 2-Speed 230V Motor to a Hayward Pro Logic System - INYOPools.com

How To Wire A 2-Speed Motor to a Hayward Pro Logic System

www.inyopools.com

 

[1poolman1]

How do you know?

The very bright flash of what appears to be a dead short, followed by the acrid smell of burned insulation, and a large snap when the breaker in the panel right in front of you trips. Motor didn't die that time, but I know of ones that have. I only made the mistake once. Did virtually everything wrong very early in my career. Even had the wiring compartment open while testing. Watch a start capacitor blow and you won't do that again, either. "Once bitten . . ."