Some Reasons for Generator Low-Frequency Problem

Generator Low-Frequency Problem Overview

When your generator outputs lower than the standard level of frequency, it becomes a great problem of continuous power supply and it could happen due to a number of reasons.

Usually, most of the countries follow the standard frequency of a generator 50 Hz, failure of which may cause machine failure or safety accidents.

Here are some common reasons that you may take into account before you going to repair your generator’s low-frequency problem:

  1. Do you feel the prime mover sounds abnormal than the usual sound or detect slow speed etc. may be the reason for your generator low frequency problem;
  2. Damaged pole of a multiple rotor or stator may be the other reason of low frequency;
  3. Decrease or increase in the supply power system may be a reason for this problem’
  4. Nozzle assembly failure, fuel filter failure, fuel pump failure, excessive unit vibration or a heavy load, etc. are also the key reasons for low frequency.
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If you find any of the above problems, you should go or call an electrician with no more delay to repair your generator, else you may think of a new generator in replacement of your existing one.

Some Reasons for Generator Low Frequency Problem

Frequency Measurement Using Digital Multimeter

A digital multimeter is used to measure voltage, resistance, and current.

There are some DMMs with the ability to test capacitors and transistors. A DMM can also be used to detect non-continuity infuses and wires.

Setting up a multimeter to measure Ohms, Volts or Amps

You can set resistance, voltage, and current ranges on a multimeter by rotating its selection dial. This sets the meter to the quantity that is being measured. It is advisable to use the lowest possible range to help get the most accurate readings.

Safety when measuring mains voltages

  • Ensure that the meter has no exposed conductors and test leads are in good shape when measuring mains voltage.
  • Ensure that the test leads are tucked into the meter’s voltage and common sockets to avoid blowing it up.
  • Set the meter’s dial range to the highest AC voltage range.
  • Switch off power at the point where you want to test voltage
  • Turn on the power at the switch and take the voltage measurements.

A DMM is a handy tool for DIY fans, people who do car maintenance or troubleshoot electrical and electronic equipment.

Diagnosis is key to having a safe working environment where their power is being used.

What You Should Know on Generator Frequency Adjustment

Usually, the number of magnetic poles and rotational speed control the output frequency of a generator.

Here, we have mentioned three facts on generator frequency adjustment that you may look are as follows:

Generator Frequency Fluctuation:

Generator frequency fluctuation usually occurs when the generator is under loading mood.

When the diesel engine is struggling or hunting randomly on a continuous basis you could find abnormal frequency dropping rising on the control panel.

There are some reasons which cause of generator frequency fluctuation.

For example, sudden machinery load which is beyond generator capacity & range puts the generator in a hard struggle to cope with it and keep the balance.

Irregular closing & opening of Motor drives down are behind of generator overload as well as old motor drives without electronic governor also behind of rising large spike beyond of generator’s loading capacity.

Reasons for Generator Low Frequency Problem

Restriction on fuel flow or irregular fuel pump two major reasons for frequency fluctuation.

The AVR (Automatic Voltage Regulator) which is established on the alternator key duty is to monitor the power output may sometimes fail or works sporadically causes frequency fluctuation.

Excessive Generator Hertz:

Generally, the generator Hertz is limited to 50 Hz which means exciter has 3x pole count on the synchronous like 2 pole sync with 6 pole exciter or 4 poles sync with 12 pole exciter.

In the 60 Hz frequency of a motor, the line has 2.5x pole count like 4 pole sync with 10 pole exciter. High frequency indicates more output on the provided volume.

It may be mentioned here that high-frequency generators (higher than 50Hz or 60Hz) are used in the aviation industry driven by high-speed gas turbines that gives the capability to fly in the sky.

Champion Generator Carburetor Adjustment:

The company Champion Power Equipment usually produces four types of gas-powered generators especially for camping, powering RV’s, emergency standby power and supporting of on-site construction power requirement.

As to ensure the smooth-running engine it’s very important to keep the carburetor and linkages clean and well adjusted.

For that, you need to confirm through the air filter that the air coming into the carburetor is clean and free of debris. and the linkages which are to be found to the carburetor’s throttle & choke plates also should be clean.

Checking your generator’s hertz.

The output frequency of a generator is quantified in Hertz. Hertz means the number of alternating current (AC) cycles each second. For a generator to be effective, there must be necessary adjustments.

However, these adjustments cannot be made without testing or measuring your generator’s frequency. Often, your generator’s user manual will give you the steps in regulating the generator’s frequency.

Below is an outline of how to check Hertz on a generator quickly and cheaply.


• Kill-A-Watt meter

• Incandescent lamp or small heater.

Connect the Kill-A-Watt meter to an ordinary 110-volt outlet. You can make this connection right to the generator, or a socket plugged into it.

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Start the generator and leave it to attain maximum running temperature. Connect a small heater or a heat lamp to the generator to create a load.

Enter the “Hz” key on your Kill-A-Watt meter. You can then proceed to Read the frequency results directly from the liquid crystal display (LCD) screen.

How to fix generator low-frequency problem

Generator low-frequency problems are common concerns in the world of generators, especially when it comes to home use.

This is because most people don’t know how to properly maintain their generators. The good news is that there’s an easy way to solve this issue without having to spend hours on end trying to figure out why your generator isn’t working as well as you’d like it to. All you need to do is follow these steps:

Materials required

• A functioning generator
• An oscilloscope
• Some basic knowledge of electricity


  1. Turn off the power supply to the unit by unplugging it from its outlet.
  2. Check voltage at the terminals of the battery. It should read 12 volts DC. If not, then check the wiring between the battery and the alternator. Also, make sure that the battery’s positive terminal has been wired into the correct position relative to the negative terminal.
  3. Connect the probe leads onto the two terminals of the battery. You can connect one lead directly to each terminal or attach both probes to the same terminal.
  4. Attach the ground wire to the chassis of the generator.
  5. Plug the AC cord back into the wall socket.
  6. Start up the engine and let it run until the engine starts turning over smoothly;then, disconnect the AC cord from the wall socket.
  7. Using the oscilloscope, observe the waveform produced by the motor shaft while running. Look for any irregularities such as spikes, dips, etc.
  8. Disconnect the oscilloscope from the generator. Now, look at the waveforms again but this time, note the number of cycles per second displayed on the screen. Compare this value against the manufacturer’s specifications. If the values differ significantly, then chances are that the machine needs maintenance.
  9. Repeat step 8 above until the numbers match up exactly.
  10. When everything matches up perfectly, start up the generator once more and see whether or not the problem persists. If it does, repeat the process described above. Otherwise, your generator now runs just fine.

Generator low frequency problem

What causes low frequency in generators?

Many different factors can cause low frequency in generators. For example, the windings of a generator are designed to be wound with several layers of wire on top of each other.

When you have multiple layers, it is easy for one layer to slip out of position and create an imbalance that causes vibration or even damage to the generator. Another common issue is when there is too much resistance between two parts inside the generator itself.

This can also lead to low-frequency issues because electricity cannot flow through easily when there is not enough space between these components.

How do you increase the frequency of a generator?

A simple way to increase the frequency of a generator is by using a capacitive load bank. This device acts as a load on the system and forces it to run correctly, without damaging itself or other equipment connected with it. The speed of this device can be set manually so you know exactly how much power your devices need before starting them up again.

What controls the frequency of a generator?

The frequency is controlled by an exciter. It is usually a small motor running at the same speed as the generator. There are two types of exciters, permanent magnet and field-oriented control (FOC). How do you stabilize frequency?

The answer is simple; use an inductor! Inductors are made from coils of wire which can store energy when they are energized with the current. When the current stops flowing through them, this stored energy remains for a brief moment before dissipating into heat.

Which is better 50Hz or 60Hz?

There is a lot of confusion about how many times per second the refresh rate should be. The answer to this question depends on your specific needs and preferences. There are several variables that come into play when deciding which frequency is best for you.

How accurate is the mains frequency?

The accuracy of the mains frequency varies from country to country. In the United States, the mains frequency is 60 Hz. Most people know that a standard AC outlet in America yields 120 volts of electricity at 60 hertz (Hz). In the UK, for example, it is 50Hz ± 0.1%. But in other countries like France and Japan, it can be as low as 50Hz ±0.05% or even lower than that! This means that if you are working with a 1 MHz clock signal then its actual value will vary between 999 kHz and 1001kHz depending on where you are located.

What is a low RPM generator?

The low RPM generator is a type of alternator that works at slow rotational speeds. Low RPM generators are used in many industries across the world. They are commonly used in manufacturing, mining, and construction. These machines can be found on job sites where power is needed to run tools or equipment that require a consistent source of electricity. Why is the power grid 60Hz?

The choice of 50Hz versus 60 Hz is merely for historical reasons, with businesses in the US producing equipment that runs at 60 Hz and those in Europe making equipment that runs at 50Hz to maintain a monopoly.

Can you convert 50Hz to 60Hz?

Yes, you can! You can use a frequency converter to convert both 60Hz and 50Hz to 60Hz and 50Hz for household equipment. Trying to use it directly on a machine without the converter will not work as the machine won’t know what it’s supposed to be doing.


The frequencies range between 50Hz to 60Hz depending on the country. Both frequencies work effectively on the appliances within the specified regions.

Things such as windings of a generator cause low frequency in generators. It is possible to increase the frequency in a generator using a capacitive load bank and control the frequency using an exciter. In order to stabilize the frequency one can make use of an indicator.

Fixing generator low-frequency issues is easy. You only need to follow this guide and have your appliance working just fine.

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