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What Is Pool Pump Capacitor？How To Replacement Pool Pump Capacitor

What Is Pool Pump Capacitor？How To Replacement Pool Pump Capacitor

September 05 , 2023 0

Capacitors, often referred to simply as capacitors for their ability to hold charge, are denoted by the letter C. DEFINITION: A capacitor, as the name implies, is 'a container for electricity' and is a device that holds an electrical charge. In this article, we will mainly mention about pool pump capacitors and how to replace pool pump capacitors to expand on these two aspects

What Is The Role Of The Capacitor In The Water Pump?

Water pump motor capacitance role: single-phase motor flow of single-phase current can not produce a rotating magnetic field, need to take capacitance used to phase, the purpose is to make the two windings in the current produces nearly 90 ゜゜ phase difference, in order to produce a rotating magnetic field. Water pump capacitance with "microfarads" (μF) said.

Methods Of Changing The Direction Of Motor Rotation

1. Capacitor-run single-phase motors. This type of motor actually uses a capacitor to split the "single-phase" alternating current into "two-phase" alternating current with a phase close to 90 degrees, so that the motor generates a rotating magnetic field. Therefore, by adjusting the head and tail of any of the two-phase windings, the direction of rotation of the magnetic field can be changed, thus changing the direction of rotation of the motor.

2、Single-phase motor with split-phase starting. The secondary winding in this kind of motor is only connected to the electric appliance during the starting process, so it is also called the starting winding. During the starting process, under the joint action of the starting winding and the working winding, a rotating magnetic field is generated as in the case of capacitor-run motors, so that the motor starts to rotate. After the start winding is de-energized, the alternating pulsating magnetic field generated by the work winding continues to maintain the motor in a continuous rotation with no change in direction. Therefore, if you want to change the direction of rotation of this type of motor, it is handled in the same way as a capacitor-run motor. Specifically according to the principle and its wiring instructions for reconnection.

The Method Of Detecting Whether The Capacitor Is Damaged Or Not:

There are 3 kinds of bad capacitors: 1, leakage; 2, breakdown; 3, no capacity.

1、Detection of small capacitors below 10pF

Because the capacity of fixed capacitors below 10pF is too small to measure with a multimeter, can only qualitatively check whether there is leakage, internal short-circuit or breakdown phenomenon. Measurement, you can choose the multimeter R × 10k block, with two pens were connected to any two pins of the capacitor, the resistance should be infinity. If the measured resistance (pointer swing to the right) is zero, then the capacitor leakage damage or internal breakdown.

2, Detection Of 10PF ~ 0.01μF fixed capacitors

Detection of 10PF ~ 0.01μF of fixed capacitors whether charging phenomenon, and then determine its good or bad, the multimeter can choose R × 1k block, the two transistor β-value are more than 100, and penetration current should be small.

Can choose 3DG6 and other models of silicon transistors to form a composite tube. The red and black pens of the multimeter are connected to the emitter e and collector c of the composite tube. Due to the amplifying effect of the composite transistor, the measured capacitance of the charge and discharge process to be amplified, so that the multimeter pointer swing amplitude increased, thus facilitating observation. It should be noted that: in the test operation, especially in the measurement of smaller capacitance, to repeatedly switch the measured capacitance pin contact A, B two points, in order to clearly see the multimeter pointer swing.

3、Detection of fixed capacitance above 0.01μF

Detection of 0.01μF or more fixed capacitance, the multimeter can be used to directly test the capacitor with or without charging process as well as internal short-circuit or leakage, and according to the magnitude of the pointer to the right of the magnitude of the oscillation of the capacitor's capacity is estimated.

The Pump Capacitor Selection

Single-phase motor running capacitor can be selected according to each 100W with 1-4UF. That is: 1000W should choose C running = 1000/100 * 2 (1.5) = 20UF (15) microfarads). Start capacitance should choose the working capacitance of 4-10 times. That is: C start = 20 * 10 = 200UF microfarads. Why 1000W single-phase motor should be selected 10 times? Because single-phase motors of more than 1000W need larger starting torque, so choose 10 times.

The capacitance required for single-phase operation of three-phase motors is optimal when the voltage across the capacitor is 110V at the time of operation.

Selection of capacitor voltage:

Withstand voltage formula: U (capacitance) is greater than or equal to 1.5 * U; such as AC220V motor, usually use 400V or 450V capacitor.

Caution:

Capacitor selection for motors has strict requirements on voltage, which must be equal to or greater than more than 1.5 times the rated voltage of the motor. The rated voltage of 220V power supply, capacitor rated voltage can not be lower than 400V. capacitance value has a certain breadth, bigger and smaller are not relevant, especially the starting capacitance, can be in the working capacitance of 2-6 times the selection.

Selection of capacitance capacity:

1, single-phase operating capacitance formula: C = 1950 × I / U × cosφ (microfarads) (with a capacitor, both start capacitance and operating capacitance, electric fans, washing machines and other small-capacity motors commonly used)

Example: a single-phase motor, rated current is 4.8A, power 750W, the use of how large the capacitance. C = 1950 × I / U × cosφ (microfarads) = 1950 × 4.8 / 220 × 0.8 = 34 (uF)

2, start capacitance capacity formula : C = 3500 * I / U * cos φ (microfarads) (with a capacitor is only put into the start, disconnected during normal operation, switch with a transfer switch or centrifugal switch switch)

Note: I is the size of the current, U is the size of the voltage, COS is the power factor. The capacity of the starting capacitor is 2 to 3 times that of the running capacitor.

What Are The Steps To Replace The Water Pump Capacitor?

1. Remove the pump: First you need to unplug the submersible pump from the power supply and release its power cord.

2. Open the pump body: Use a screwdriver to remove the screws on the heat shield of the submersible pump, and a hammer to tap part of the side of the pump body to separate it.

3. Locate the capacitor: Locate the capacitor around the battery pack, remove the capacitor's terminals, and check the capacitor with a multimeter to see if it is bad.

4. Remove Capacitor: Use flat-nosed pliers to pull the two clips at the top of the capacitor cover apart and remove the capacitor.

5. Replace the capacitor: According to the parameters of the original capacitor, purchase a capacitor with the same specifications and replace it on the small submersible pump.

6. Shut down the pump and test the motor: Shut down the pump again, turn on the power cord and test the motor to see if it starts properly.