Can i replace capacitor with higher uf

The rule of thumb is to select capacitors with voltage ratings higher than those expected in the circuit as a buffer. So, if you decide to replace a capacitor with a lower uf one, make sure that the new capacitor has the same voltage rating of the one you are replacing or is larger.

The main construction of a capacitor involves two electrical conductors plates , separated by an insulating material known as a Dielectric. The dielectric can be any insulating material which ranges from glass, ceramic, plastic film, air, paper, mica etc. So, when you are deciding to replace a capacitor with a lower uf one, you will have to make sure that the capacitor type can be suitable in the circuit. Below are some common rules for different types of capacitors that will help you when you are replacing a capacitor:.

Again, just like replacing a capacitor with a lower uf, it all depends on the function of the capacitor in the circuit.

Search for:. Capacitors are one of the most commonly used components in electronic and electrical circuits. I shall cover this in a bit more detail in this article. What is the capacitor uf? Applications of a capacitor The capacitor has many uses in a circuit apart from just storing charge which can include; Eliminating ripples Blocking DC voltage Smoothing output of power supplies Tuning of frequencies in resonant circuits Stabilizing voltage and power flow in electric power transmission Coupling Decoupling Motor Starters Energy Storage Power Factor correction High-pass and Low-pass filters Noise Filters and snubbers Can you replace a capacitor with a lower uf?

Below are some effects lowering the uf of a capacitor can have on different circuits. Timer circuit — lowering the uf of the capacitor will affect the timing intervals which could be good or bad depending on the needs of the application Motor or light dimming circuit — Depending on how much you lower the capacitance, the results can vary Feedback loop Amplifier circuit — This again would affect the workings of the circuit considerably, as the values of the capacitor are chosen specifically.

Potential relays are also as important. Potential relays are used to electronically connect and disconnect to starting capacitors from the motor circuit See Figure 2. Each relay has a specific voltage rating to place the start capacitor in series with the start winding and a specific voltage to take it out of the circuit.

Each rating is based on the electromagnetic field generated by the rotation of the motor. The motor manufacturer studies the effect of placing in and taking out the capacitor to increase starting torque with as little winding flex as possible. Potential relays have four ratings; 1 continuous coil voltage, 2 minimum pick-up voltage, 3 maximum pick-up voltage, and 4 drop out voltage.

A potential relay is difficult to check and should always be replaced when a start capacitor is replaced. The exact size designed for that particular motor must be reinstalled. The potential relay must also be replaced if contacts are found to be open.

During each exercise, the student should record the noise level, the speed, the temperature, and the amperage of the motor. Be sure to insulate the wire ends. This will simulate an open capacitor. Block front of blower to obtain correct motor speed and amp draw. Active Oldest Votes. And great so i can just use a uF instead?

Most of the convenient values are higher, though. And yes, Nichicon is a reputable brand. If it is used for some other function not very likely in a PSU then the answer reverts to it depends. Show 1 more comment. Sign up or log in Sign up using Google. Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. In both instances, be it too large or too small, the life of the motor will be shortened due to overheated motor windings.

Yes, with no problems, the voltage rating is just the maximum voltage you can deal with that capacitor. Make sure what voltages you are dealing with. Never exceed 25V if you are using 25v rated cap. Similarly never exceed 16v for a 16v rated cap. You can almost always replace a capacitor with one of a higher voltage. This is the limiting factor of a capacitor due to dielectric breakdown voltages that the manufacturer chose.

Varying capacitance gets a little trickier. Can I replace capacitor with lower UF? Yes, it's possible given the necessary skills and tools. Yes, it's safe. The only rating that matters for safety is the rated voltage: if you put a higher voltage than the maximum you might see your cap explode. What happens if I use the wrong capacitor? If the wrong capacitor rating or a poor quality capacitor is used, then the motor will not have the correct phase angle between the current and the voltage, and consequently the motor torque or rotational force will be affected.

Depending on the motor load, this may result in a reduction in the motor's overall speed. What are the symptoms of a bad run capacitor?