Frequently Asked Generator Questions

Can I use this generator for my home/shop/business etc.

When looking at an old generator, you first need to know if it makes AC or DC electricity.

DC might be useful if you have a battery bank to charge and you run all your AC appliances off an inverter that is powered by the batteries. High voltage DC is more dangerous than similar voltage levels of AC power and can exceed the rating of switches and fuses, so be careful. DC power of the correct voltage can be used directly for a few AC rated things like incandescent lights and resistance heating elements and old fashoned "universal" motors like hand power tools have. Modern variable speed AC electric tools DO NOT work with DC power, only the old single speed things like grinders, drills and skill saws etc which have brushes in the motor.

If you have an AC generator, you might have one that generates at a voltage or frequency that is useless in your situation. The most common might be a 480 volt 3 phase set or how about one of the military surplus 400 hz sets that come up for sale. What can you do with 400 hz AC? About the same things as with DC power, except you can't charge batteries directly.

If your generator makes the wrong voltage AC power, it might be reconnectable to change the output voltage or you could use a transformer to change the voltage level of the generator output to what you need. Transformers do not change the frequency, only the voltage, they also do not work on DC power.

My generator is 3 phase, can I get single phase power from it? Yes you can. 3 phase equipment connects to all 3 lines from the generator output, while single phase may use either 2 lines or 1 line and the neutral.

For example a 120/208 3 phase generator can supply 120 volt circuits from any of the 3 lines and the neutral (L-N). If it is possible to balance the load across all 3 lines, that would be ideal, but it is seldom possible and unless the load is a large part of the rated load of the generator, any imbalance is not likely to cause problems.

The same 120/208 3 phase generator can supply single phase loads connected between any 2 lines (L-L). These loads will get 208 volts SINGLE PHASE power. (((((((((( *I know, I know! It uses 2 lines/phases, so it must be 2 phase. NO, it's single phase if it is connected to 2 lines of a 3 phase source. If it connects to all 3 lines, it's 3 phase. So what happened to 2 phase? It was the standard method of generating and delivering power early in the 20'th century, but was long ago replaced by 3 phase equipment in most of North America except in a few isolated situations. For all intents and purposes, 2 phase AC power doesn't exist in North America.))))))))))

If the equipment is labled for 208 volts ( sometimes tagged 200V) you're good to go, but if your stuff is only labled 230 volt, you might have problems because of the low voltage. A heavily loaded motor might not be able to start because it's starting current surge normally pulls the voltage down a lot and starting at 208 instead of 240 means you don't have as far to go before getting into difficulty. A stalled/unable to start motor may burn up if it's overload or a fuse in the supply doesn't operate to stop it quickly enough. Loads like electric resistance heating elements will heat slower on 208 than 240 volts, but will not be harmed. Again it is great to balance the load across all 3 phases A-B, B-C, C-A, but it can be impossible if your home is wired for single phase power. If you can only load 2 phases of the 3 phase generator with your single phase loads, you will not be able to use the full rated capacity of the 3 phase generator, but the imbalance will not likely cause a problem.

Please feel free to add to this thread or contact me with any concerns and I will attempt to clarify/revise it. FAQ: How to Setup the Frequency & Voltage on a Genset

This was written by one of our Resident SmartGuys, (Gunny) specifically for folks, who are NOT Genset Mechanics, and are trying to understand the Basics, of how Gensets Work, and are Setup.

This is about AC (Alternating Current), different rules apply for DC (Direct Current). The difference is that with DC, one wire is positive the other is negative, with AC, they alternate. When they alternate 60 times a second, we have 60Hz power, the standard for the US. Occasionally we encounter something a little different, like 50 Hz or 400 Hz.

The frequency of a generators Output Power is directly dependent on the design of the generator rotor and engine speed. The most common generators we encounter are either 2 or 4 pole, the 2 pole generators must turn at rpm to generate a 60Hz output and a 4 pole machine turns at rpm.

Voltage is the force of the electrcity and can be compared to pressure in a water system. The usual voltages we encounter are single phase 120/240 Vac. This system has 4 wires, (2) hots, a neutral and a ground. Voltage measured between the hots should be 240 Vac and between either hot and the neutral, 120 Vac. Variations to this would be the three phase systems with an additional hot, in other words (5) wires, (3) hots, a neutral and a ground. Three common US phase combinations are usually 120/208 Vac, 120/240 Vac and 277/480 Vac, with other combinations possible when the frequency slows to 50 HZ.

Amperage is the amount of current passing a particular point, how many electrons go by in that wire. Can be compared to flow or volume in a hydraulic system. Amps are an indication of how much electricity you are using.

Generators have (2) devices that directly affect the output, the voltage regulator controls the output voltage, if your machine has one and not all of them do. The other device is the engine governor. This controls engine speed and thus the output frequency.

It is very important that the engine be running at the correct speed with and without load as the voltage regulating system only works well within a narrow window, too slow and voltage is too low, too high and voltage will probably be too high, either case causing equipment damage. Best to first adjust frequency, use a good quality meter such as any of the Fluke brand, if a known good meter is not avalible a tachometer can be used to measure the engine speed. You can check a frequency meter by measuring normal power from your power company, the meter should read either 59.99 or 60.00, no other reading is acceptable.

Governors are either mechanical or electronic. On a mechanical governor, spring tension is what adjusts the speed. An electronic governor will have an adjustment labeled speed. As there are a lot of different designs, best to get a service manual for your particular machine and follow the proceedure.

Voltage regulators regulate the genset output voltage by controlling the level of magnetism in the rotor. Several ways this is done through an optical coupling, rotating exciter, slip rings & brushes but the point is there should be an adjustment or two, sometimes more, on a voltage regulator. One adjustment is the voltage level, the other stability. A large number of voltage regulators will read generator frequency and if too low, it will back off the excitation voltage. This is done this way for a couple of reasons, one is to allow the engine to get back to proper speed should a large load be applied that is causing the engine to loose speed.

Generators without voltage regulators are not as common, but there are still a lot of them around. They use some of the ouput voltage, pass it through a rectifier and use it for excitation. Simple, cheap and reliable IF you never shut the engine down while powering a load. Most of the cheaper and smaller Gensets fall in to this group.

Generator output. Most of the machines we deal with here are either 4 wire or 12 wire output, there are 10 lead machines but rarely encountered anymore. This refers to the number of load wires coming out of the stator windings. A 4 wire is what it is, no changing it. A 12 wire can be reconfigured to any of the common voltage schemes, 120/240 Vac, 277/480 Vac, whatever suits you. These output leads should be marked 1 through 12, some English stuff (Newage comes to mind) might be different and use letters. A reconnectable generator usually has a drawing, decal or a printing showing all the possible combinations. This drawing will also show any other changes that may be needed such as repositioning of jumpers on the voltage regulator.

Onan model/spec numbers are very important when inquiring about a particular machine. A voltage code will tell us if your machine is reconfigurable/what it left the factory as. Particularly desireable Onans will have a voltage code of -18R, a -4X is less useful should you want to change voltage, there are other codes, just used these for an example. There is a FAQ in the Onan Forum that gives most of the Onan Voltage Codes. http://www.smokstak.com/forum/showthread.php?t=

It is always an excellent idea to get a service manual for your generator. Read and understand any proceedure before taking action. Follow accepted practise and safety proceedure. You are dealing with electricity, rotating machinery, hot parts, and flammable fuels.

Thanks to all our Resident SmartGuys, who helped in writing the Forums FAQ's. Re: FAQ: How to Setup the Frequency & Voltage on a Genset

A GOOD WAY TO SET ENGINE SPEED/GENERATOR FREQUENCY.

PLEASE NOTE THAT YOU MUST BE CAREFUL WHEN DOING THIS OR YOU COULD END UP BEING A CRISPY CRITTER!

Since the North American power grid runs at a very accurate 60 Hz frequency, it is about the best standard you can get for checking your generator frequency.

Here's how you do it. First and -very- important, connect the neutral of the genset to the neutral of your commercial power source. Do the same with the grounds.

Now, take a couple of identical (say, 60 Watt) 120 volt light bulbs and hook them in series so you have, in effect, a 240 volt light bulb. The reason you need 240 volts worth of bulbs is that, when the generator output sine wave is exactly opposite the sine wave from the commercial power, there will be twice the line voltage across the lamps.

Now, connect one end of the series string to the 120 volt hot lead of your generator and hook the other end of the series string to the 120 volt hot lead of your commercial power. With the generator -not- running, the light bulbs should be at half brightness.

Now, start the generator. The light bulbs will vary from full on (240 volts) to full off (zero volts) at exactly the difference frequency between your generator and commercial power.

If your generator speed is close, the bulbs will flicker. To find out if you're fast or slow, nudge the governor a little fast and see if the flicker rate increases or decreases.

- If the flicker rate increases, you are running fast and need to adjust the governor a little slower until, without any other load, the lights go on and off about twice a second. This will mean that you're running at about 62 Hz.

- If the flicker rate slows down when you nudge the speed upward, you need to adjust the governor up until the lights are -very- slowly changing brightness then increase some more until the lights flicker about twice a second.

Now, if you have a way to load your generator to near full load, do so, leaving the bulbs connected. The flicker rate should be about 2 cycles -below- the 60 Hz of commercial power or about 58 Hz.

I've used this method of adjusting genset speed several times and it works well.

Take care - Elden
http://www.oldengine.org/members/durand/ KW, kVA and PF

What dos this alphabet soup of electrical values you found on the tag of your generator tell you?

kVA tells you what the generator end can do (volts X amps or "apparent" power) This value will not be found on a DC generator (unless it's exactly the same as the kW value, because DC equipment always has a PF of exactly 1.0

kW tells how much the engine can do ("real" power for doing work)

PF is the ratio of kW to kVA of the generator set.

These values can tell you things like the maximum amperage you can draw even if it's not on the tag.

To calculate the amperage of a 3 phase set ......
***Not kW***, but kVA x = VA divided by 1.732 divided by line-line voltage = amperage.
example 100kVA X =100,000 VA/1.732/208 volts= 277 amps

Or for the same 120/208 3 ph generator, kVA X = VA divided by 3phases divided by line-Neutral voltage = amperage.
example 100kVA x =100,000 VA/3=33,333 VA/120 volts=277amps.

Single phase calculation-kVA X = VA divided by line-line voltage = amps per line.
example - 5kVA x = VA/120=41.66 amps if you have only 120 volt output (not 120/240)
another case - 5kVA X = VA/240 volts= 20.8 amps. In this case, it could either be the rated amps on each 120 volt line out of the generator if it's a 120/240 generator or the rated amps on the two 240 volt lines out.

Why not use kW in these calculations?
kW is the measure of engine POWER, and determines electrical REAL POWER capacity but not amperage. The amperage required to deliver that electrical power depends on the power factor of the load. It may be an "easy", low power factor load like a lightly loaded motor, or a "hard", high power factor load like a bunch of electric strip heaters or a fully loaded high power factor motor. In either case, the same amperage limit derived from the kVA rating applies because, amps or current is what causes the heating in the generator windings.

kW or watts or real power is what causes the heating in the engine driving the generator, so kW and kVA are two different things that look alike and sometimes are equal numbers, but tell you 2 different things about a generator set.


kW divided by kVA is power factor. Usually generators are built with PF of .8, but sometimes it's 1.0 especially on smaller sets where the same engine is used on a couple of sizes of generators with a power factor of .8 with the larger generator end and 1.0 on the next size down.

Power factor of the electrical load gets more complicated, but it's still basically the same thing. First, it's not stamped on your generator's tag. The power factor of the generator set is what it is, and won't be changed unless you can safely get more power out of the engine or more amps out of the generator. The power factor of the power it delivers depends entirely on the loads connected to it.


The difference between kVA and KW is "reactive" power or "magnetizing current" which is necessary for things like AC motors and transformers to operate. It travels over the wires along with the "real" power, so it "takes up space", requiring the wires to be sized to handle it along with the real power. But reactive power requires very little/no engine power to produce it. It's conserved and moves back and forth between the generator and load along with the real power.

Because there are varying requirements for reactive power among loads you may connect to you AC generator, all kVA isn't the same.........

some is high power factor (harder for the engine-more kW and less reactive) electric heater elements and light bulbs for example
some is low power factor (easier for the engine-less kW more reactive) lightly loaded motors or older fluorescent fixtures for example
and most generators see a mix depending on what's connected to it, so it may average out (or not). If you're running a battery of incandescent light bulbs or quartz halogen spotlights, your generator's engine may not be able to power the amps indicated by the kVA number. (you have a very high power factor load mix). On the other hand if you are running a collection of lightly loaded motors and older fluorescent and HID light fixtures, you may exceed the amperage rating of your generator without ever hearing the engine labor excessively (you have a low power factor load). Can I reconnect my generator for another voltage etc?

Many generators are reconnectable. If it is designed to be reconnectable, you can usually find a schematic to follow. These are frequently inside the connection box on the generator, so that's the quickest place to check.

A single phase generator can frequently be changed from 120 only to 120/240 or 240 only by reconnecting 4 leads out of the stator in parallel or series connnection.

A 3 phase generator with 3 or 4 leads out can not be reconnected without major surgery into the lead end of the stator windings to find and bring additional leads out into the connection box.

A 6 lead stator can be reconnected from 3 ph to single phase but whatever the voltage is, it will stay in the same range. For example if it's 480 3 ph, it will be ~480 single phase if reconnected in the zigzag method. Not possible to change from high voltage to low voltage or vice versa. Instead a transformer is needed.

A 9 or 10 lead stator can be reconnected for high (series wye) and low voltage (parallel wye), but the stator arrangement will always be wye (Y or star). This means that it will be 120/208, 277/480 etc where the line-N voltage is 57% of the line-line voltage. ALWAYS, no exceptions. If one voltage is raised, the other goes with it. These 9 lead stators are not reconnectable for single phase because there is a Y connection buried in the stator where the ends of 3 stator circuits are connected together. This is usually brought out as the neutral N or sometimes designated L0 or T10.

A 12 lead stator can be reconnected for both single to 3 phase reconnections as well as high to low voltage connections, so voltages from 120 to 480 are usually available.

Reconnecting the stator leads in the correct pattern is usually only part of the reconnection process. There is frequently other reconnections to be made in the exciter/regulator system to allow it to function at the new voltage/phase arrangement. Failure to get this right can ruin your generator in short order, so some caution upon first startup after reconnection is always a good idea.

If the generator panel has a field breaker, perhaps start up with it off and only bump it on while watching the voltage and listening to the sound of the engine and generator for abnormal humming in the generator or loading of the engine. Alternatively you may be able to run the engine slow (NO LOAD!) and watch the voltage come up as you let it speed up to synchronous rpm.

Reconnecting the leads can be as easy as moving jumpers on a connection board, or require splicing stranded cable. If you have to deal with stranded cable without terminations, I would suggest either getting the proper ring terminals to crimp on the leads so you can use bolts or use split bolt connectors to make the splices securely. Any splices should be covered with layers of rubber splicing tape to cover the sharp corners of the bolts etc and then that first layer covered with layers of vinyl electrical tape. Simply using vinyl tape can allow sharp corners to chafe through and short out if the splice is against the side of the box etc.

Here are some links to stator reconnection diagrams
Single phase
http://www.smokstak.com/forum/attachment.php?attachmentid=&d=
3 phase
http://www.smokstak.com/forum/attachment.php?attachmentid=&d=

2. The composition of the diesel generator set:

Diesel engine, generator, controller. Other components: base, base fuel tank, radiator, water tank, recoil pad, anti-speaker, silencer, silent speaker, and other components.

For more information, please visit YuchaiHI.

3. How long does the diesel generator set three filter replacements?

Air filter: hours, can be more different environments to shorten the replacement cycle.

Diesel filter: the first work is 50 hours to replace after the general is 400 hours to replace. If the user uses diesel fuel which quality is not good, shorten the replacement cycle.

Oil filter: 50 hours to replace the first work, after the general is 200 hours to replace.

4. How to identify the authenticity of the engine?

Appearance: For professionals who are familiar with the engine, you can identify the authenticity of the engine by the appearance of the engine, color, overall color difference.

Marking distinguish: diesel engines have the corresponding brand logo sticker on the body.

Nameplate to distinguish: the engine has a nameplate marked with the engine number, cylinder block, oil pump, and also has the corresponding code, call the original factory to confirm the code, so you can know the authenticity of the engine.

5. Motor protection grade IP Introduction:

‘I’ represents the level of protection against the ingress of solid foreign bodies, the highest level being 6.

‘P’ stands for protection against the ingress of water, the highest level being 8.

For example, protection class IP56, IP55, etc. (D.NJ Power generators have IP56 protection class)

6. Introduction of motor insulation level:

The insulation level of the motor is divided according to the heat resistance level of the insulation material used, which is generally divided into 5 levels.

Grade A 105 degrees

Grade E 120 degrees

Grade B 130 degrees

Class F 155 degrees

H class 180 degrees

D.N Power generators have a theater rating of H.

7. Noise level introduction:

30 to 40 decibels is a more ideal quiet environment. More than 50 decibels will affect sleep and rest. 70 decibels or more will interfere with conversation and affect work efficiency. Long-term living in a noise environment of more than 90 decibels will seriously affect hearing and cause neurasthenia, headaches, increased blood pressure and other diseases. If suddenly exposed to a noisy environment of up to 150 decibels, acute trauma to the auditory organs can occur causing the eardrum to rupture and bleed and both ears to lose their hearing completely. In order to protect hearing, noise should be controlled at no more than 90 decibels; in order to ensure work and study, noise should be controlled at no more than 70 decibels in order to ensure rest and sleep, noise should be controlled at no more than 50 decibels.

8. The purpose of parallel operation of diesel generator sets:

Expansion of power supply capacity

Improve the reliability of power supply and realize uninterrupted power supply.

9. The role of ATS:

ATS is the switching switch between utility power and power generation power two sets of switching contacts, one for power generation and one for mains power. Automatic switching is possible through controller commands.

10. Fuel consumption calculation:

Fuel consumption (L/h) = rated power of diesel engine (kw) X fuel consumption rate (g/kwh) / / 0.84

(The density of diesel 0# is taken as 0.84kg/L)

11. Diesel generator set commissioning steps:

Diesel engine inspection — generator inspection — no-load commissioning — commissioning with load — filling out commissioning report — -Cleaning up the site

12. Generator sets can be divided into several categories in terms of energy:

Nuclear, hydro, wind, and fire. Among them, thermal power is further divided into coal, diesel, gasoline, gas and biogas. The generators we are now dealing with are mainly diesel generators. Diesel is divided into light diesel (0# diesel, commonly used in high-speed diesel engines) and heavy oil (120#, 180# diesel, commonly used in medium-speed diesel engines and low-speed diesel engines).

13. The main functions of the control system:

• With manual, automatic, test stop
• With various safety protection functions
• Memory for various faults in operation
• LED fault display alarm
• Display of voltage, current, frequency, etc.
• Can be connected to a PC, but requires a controller with RS232, 485 ports

14. What happens when a diesel generator set is overloaded for a long time?

The unit cannot normally be overloaded during operation, but it can withstand short-term overloads. If the unit is overloaded for too long, some conditions may occur when the power is over-rated, includes Cooling system overheating, Generator winding overheating, Low oil pressure due to decomposition of lubricant concentration, and Reduced unit life

15. What will happen if the unit load is too low?

If the unit is in low load operation for a long time, which causes the water temperature to rise less than normal, the viscosity of the oil is high and the friction becomes large. The oil in the cylinder that should be burning because of heating causes the formation of varnish on the cylinder gasket. If the low load continues, blue smoke can appear, the surface varnish of the cylinder gasket needs to be removed, or the cylinder gasket needs to be replaced.

For more information, please visit Kw Generator.

16. What do I need to pay attention to when installing the exhaust system?

Generator sets have standard features such as industrial mufflers, flexible exhaust connections, and elbows. The user can install the exhaust system with the provided the exhaust system can be installed with the provided supporting facilities. However, the following points need to be noted during installation.

1. make sure that the back pressure is lower than the set maximum (usually, don’t be below 5Kpa)
2. fix the exhaust system to avoid lateral and vertical pressure.
3. leave room for contraction and expansion
4. leave room for vibration
5. reduce exhaust noise

17. When the diesel engine temperature is too high, is it feasible to add cooling water immediately?

Absolutely not, wait until the engine is naturally cooled to room temperature before adding cooling water. If in the diesel engine water shortage overheating in the case of diesel engine water shortage and overheating, it will make the cylinder head, cylinder liner, cylinder block, etc. due to hot and cold and intense changes and cracks, causing serious damage to the engine. The engine will cause serious damage.

18. ATS self-switching operation steps.

1. The manual operation mode of the module: After turning on the power key, press the “manual” key of the module to start directly. when the unit starts successfully and runs normally, at the same time, the automation module will also enter the self-test state, and it will automatically enter the speed-up state. after the speed-up is successful, the unit will enter the automatic closing and grid connection according to the display of the module.
2. Full-automatic operation mode: Set the module in “automatic” position and the unit enters the quasi-starting state. In the automatic state, it automatically detects and discriminates the utility state for a long time through the external switch signal. Once the utility power is faulty or lost, it will enter the automatic start state immediately. When the utility power comes in, it will automatically switch the switch to lower the speed and stop. When the utility power is restored to normal, the unit will automatically trip off the grid with a 3-minute delay and automatically shut down when the system 3S confirms, and will automatically enter the next automatic start preparation state.

19. Diesel generator set cylinder sealing becomes a low bad start. How is it?

Cold start engine, especially in winter, because the piston ring and cylinder wall oil are very little, the sealing effect is poor, there will be repeatedly started and cannot fire running phenomenon. Diesel generator sets sometimes, due to cylinder wear heavy and seriously affect the sealing performance of the cylinder, making it more difficult to start. In this regard, the injector can be removed and 30 to 40ml of oil added to each cylinder to enhance the sealing performance of the cylinder and improve the pressure of compression.

20. Diesel generators since the protection function.

Diesel engines and alternators are installed with various sensors, such as water temperature sensors, oil pressure sensors, etc. Through these sensors, intuitive bar diesel engine operating status display to the operator, and with these sensors, you can set a limit, when the limit is reached or exceeded when the control system will pre-alarm, this time if the operator does not take measures, the control system will the diesel generator sets are self-protective in this way. The sensor plays the role of receiving and feeding back various information, the real display of these data and the implementation of the protection function is the control system of the diesel generator set.

21. What are the sources of noise of diesel generator sets?

Air intake noise, exhaust noise, and cooling fan noise

Combustion chamber work combustion noise, mechanical noise of engine parts friction

Noise generated by the rotor rotating at high speed in the electromagnetic field

22. Winter diesel generator set starting skills.

Preheating: The cooling system can be heated with water and the oil sump with a heat source.

Improve the airtightness: you can remove the injector and add 30-40ml of oil to each cylinder to enhance the sealing performance of the cylinder and improve the pressure during compression.

Coiling: Crank the crankshaft before starting to make it run easily before starting.

23. What is the role of the diesel generator piston ring?

• Heat transfer
• Control oil
• Support role
• Maintain airtightness

24. How many ways and in what order are there to break in a new machine?

First cold break-in, manual rotation, or external force to drive the crankshaft rotation.

Post hot break-in, no-load break-in.

25. The cause of oil deterioration?

• Use the wrong grade of engine oil, the quality is not up to standard engine oil.
• The operating condition of the unit is not good, the air and oil are fugitive, the fit-gap is too large, the oil temperature is too high, etc.
• The unit is often operated at low temperatures.
• The exhaust gas enters the oil sump and condenses into moisture and acid.
• The oil filter is too dirty, the filter is leaking inside, and the oil is not filtered through the filter.

26. The role of the oil pump?

The role of the oil pump is to give the lubrication system sufficient pressure oil, so that each mutual movement of the parts to get effective lubrication, the current diesel engines are widely used gear type and rotor type oil pump.

27. What is the role of the governor?

The governor should be able to adjust the oil supply sensitively according to the change of external load to keep the speed stable. It must have two basic parts: sensing element and actuator.

28. The function of automatic voltage stabilizer?

The automatic voltage regulator (AVR) allows the generator to closely maintain a stable voltage from no load to full load. This AVR has a voltage frequency (Hz) proportional characteristic that correctly adjusts to reduce the output voltage when the rated speed is reduced. This feature helps to protect the engine when a large load is suddenly added.

29. The maintenance of the battery?

For frequent use of the machine, the battery is generally not a problem, as long as the policy of good maintenance, if the battery is not used for a long time, it is necessary to regularly check its power and charge it every 12 weeks (8 weeks in the tropics).

30. Under what circumstances does the unit automatically delay shutdown?

Fuel level too low, water temperature too high, water level too low, overload, start failure and signal accordingly.

31. Under what circumstances is the emergency shutdown of the unit?

Over speed, short circuit, phase loss, over-voltage, loss of voltage, low frequency

32. Under what circumstances does the unit automatically issue an audible and visual alarm signal?

Low oil pressure, high water temperature, low water level, overload, start failure, Overspeed, short circuit, phase loss, high voltage, loss of voltage, low frequency, low starting battery voltage, high starting battery voltage, low oil level, and the alarm system of the unit has relay contacts.

33. Diesel generator sets of oil filter types?

• Mechanical separation
• Centrifugal separation
• Magnetic adsorption

34. What is the reason for the compression ratio becoming smaller?

The low position of the piston at the end of compression: related parts wear, deformation, etc.

Combustion chamber volume becomes large: valve seat ring wear, piston top depression, cylinder gasket is too thick, etc.

35. Which does include diesel generator sets of automatic control functions?

• Automatic heating device
• Automatic regulation of diesel engine speed
• Charging system
• Instrumentation System Self
• Protection devices
• Starter System

36. The working principle of the automatic heating device?

On the diesel engine, generally add a cooling water automatic heating device to get the generator set in the standby state. the diesel engine should be in a hot state so that the generator set in the utility power loss within 15s to start the generator set and work with a load.

Diesel engine automatic heating device when the water temperature is lower than 30 degrees Celsius. the thermostat contacts will be turned on, KM will be sucked, and heater EH will work. When the water temperature rises to 50 degrees Celsius, the thermostat contacts will break, KM will release, and the heater EH will be disconnected.

In addition to the cooling water heater, there is also an oil heater and a battery heater.

37. How to observe the power of a maintenance-free battery with naked eyes?

There is usually a transparent observation port above the battery. When we look down from above, we can see the color inside. The green color indicates that the battery power is sufficient, the white color indicates the need for charging, and the black color indicates it needs to be replaced.

38. What is the white solid on the battery terminals?

This is a normal phenomenon. The white solid caused by the oxidation of the battery terminal and air will disappear after being washed with boiling water.

So that’s it! if you still have questions about your and diesel generator set and you cannot find the answer here, you are very welcome to ask us! May these articles help you to save your day and even your diesel gen-set!

If you want to learn more, please visit our website Electric Wheelloader.