Frequently Asked Questions

What are the applications for power diesel generator?

Engine generator are available as general-use type, emergency use type and mobile use type for various applications, and are classified as stationary type or mobile type depending on the method of installation.

General use type

The engine generator can be used as a general use power source on a remote island or in areas where no power supply Is available from a power company, or in any situation where the power supply from a power company involve a huge cost, thus creating economical disadvantage.

Emergency Use type

Even a momentary power failure is not permissible in the important public utilities such as gas or water supply or sewage plants, or in the broadcasting station and radio communication bases that play a key role in the information age. An unexpected power failure occurring in a department store, hotel, hospital or underground city where people gather for particular activities where electrical power form a high level system of control, which will cause a functional disorder or even loss of life in daily activities.

In event of disaster, emergency –use generators for standby (other than for disaster prevention). Disaster prevention generator should be installed as power source for fire fighting equipment. General power failure use generators are use for purposes other than disaster prevention, and they are started up either manually or automatically in combination with an automatic main failure (AMF panel).

Mobility-use type

Mobile use generator are available in a transportable, compact, lightweight design for easy movement to civil engineering, construction or road works site and as a vehicle mounted type for use in communication facilities requirement movement.

Classification by installation method

Engine generators are classified into mobile engine generators (transportable-type. vehicle-mounted type and power source car type) and stationary engine generators.

  1. Transportable engine generators
    Transportable engine generators are used as power sources for general construction work machines, building works, agricultural, fishery and other general works.

  2. Vehicle mounted engine generators
    Engine generators of this type are mounted on medical examination wagons, communications link repeater cars, tv relay wagon and other power source vehicle used for various events.

  3. Stationary engine generators
    Stationary engine generators are used as emergency power source in buildings plants and cattle shed, and as general use power sources in isolated mountainous areas and on isolated islands. Recently this type of generator is being used for seasonally operated food and fishery processing plants, cooling facilities used in summer only, skiing grounds operated in winter season only, and as peak cut engine generators or co-generation systems for golf course, stone crushing plants convenience stores, leisure facilities where the peak use of electricity is limited to specific time period, and hotel with which the economical contract of power supply is made.

How do we classified engine generators?

Classification of frequency

In Japan, the power frequencies are 50 hz/60hz. It is essential that engine generators be operated at one or other of these frequencies. In general, the transportable type engine generator with a power output of 7.5kva or more will be a 50 hz/60hz dual machine, but it should be noted that the transportable type with an output of less than 7.5kva and the stationary type engine generator are 50hz or 60hz only machine.

Classification by Phase

AC power for home use is transmitted as single phase and the driving power used in plants as three phases. Engine generator is available in a single or three phase type to match the application. Engine generators of less than 5kva are of the single phase type and those of 5kva or more are of the three phase type.

Classification by Voltage

The single phase engine generators are restricted to either 50 hz- 100v or 60 hz- 110v operation. The three phase engine generators are designed for dual operations at 50 Hz – 200V and 60 Hz – 220V. Denyo engine generators of 100kv or more (rated output at 60hz) excluding 1100SP type) are capable of switch over between an output of 50hz-200V and 400V, or 60Hz-220V and 440V( dual voltage specifications)

What should I consider when selecting for electrical generators?

The factors to be taken into consideration when selecting any transportable engine generator capable of supplying power for a wide range of applications in general outdoor works such as civil engineering, construction and road works will be described in this section.

  1. Output of the engine generator should be determine by defining the type , capacity and quantity of loads to be used and condition of use, taking into consideration not only immediate but also of future use.

  2. Performance is necessary for a motor load to provide stability against heavy motor load fluctuations that has a high durability

  3. Noise regulations act in municipal ordinances are becoming stricter every year and there are cases where works carried out in urban areas must use a sound-proof structured engine generator or be forced to stop because of complaints from resident about noise. It’s is necessary to selected a quite machine, certified as very low or low noise type machines by the authority. It is necessary to select machines that are certified as exhaust gas prevention type construction machine.

  4. Compact light weight and two stack type machine will make loading and unloading easier on to vehicle such as truck and safekeeping that is strong enough to allow double stacking for space saving.

  5. Low fuel consumption for an engine generator is the most useful machine for providing optimum support on a worksite, but its running cost are not significant. Thus having a machine with low fuel consumption will benefits in the long run.

  6. Ease operation is important in such an extend that anyone can operates the machine anywhere, anytime and anywhere. It is also important to select features which not only ease operation but also ease of daily checking and maintenance.

  7. Protection equipment is important to select an engine generator with a circuit breaker to protect the generator against short circuit or overloads on the load side, electric leak protects the equipment to protect against electric shock or other accident due to leakage, the protection equipment will also prevent any engine trouble due to high water temperature or low oil pressure.

  8. Dual voltage - The higher the engine generator voltage the higher the load capacity. Denyo generator with the DCA 125 and higher class are dual voltage compatible as standard specifications.

  9. Parallel Operation enables 2 machine work together to provide the desire output of a single machine. This operation may be more economical than depending on a single high capacity itself.

  10. After sales services is essential to provide a quick after sales service including supply of parts , troubleshooting and repairs. A huge loss will be incurred if these backup are delayed.