Skip to main content

Why My Generator Can Start But No Voltage Output?


After generator starts up, there is no voltage, the most possible reason is the generator has no magnetic field.

Why is there no magnetic filed in generator?

Fault phenomenon:

After standby generator set idle for a long period of time, when restart, there is no AC voltage output. Measure the main output winding, and the voltage between phases is "0" or lower than "5vac".

The reason:

Generator has not been used for a long time, resulting in losing remanence contained in iron core. The excitation coil can't establish the proper magnetic field. At this time, the generator set runs normally but does not generate voltage. This kind of fault often occurs in new generator set, generator set stored in humid environment or generator set not used for a long time.

How to deal with no magnetic field problem of generator?

1.Check the main output circuit of the generator to avoid the excitation cannot be established due to the short circuit at the output end.

2.if there is excitation and magnetization button, press the excitation and magnetization button.

3.If there is no excitation button, use the battery to magnetize it. The specific method is:

a.Use 12V DC battery, connect negative pole to "XX" terminal of AVR board, the positive pole is connected to the "X" terminal of AVR through a diode.

b.Restart the generator set and record the main stator output voltage, the voltage is close to the rated voltage, or the voltage between P2-P3 of AVR terminal is 170-250V.

c.Shut down the unit, then disconnect the battery power supply of "X" and "XX" terminals, and restart the generator set. At this time, the generator set should be able to operate normally. If there is still no voltage, it can be considered that there is a problem with the generator set or AVR.

Here is an other method of resolution:

First, look at the gloss level of the two slip rings. If there is no lustre, rub it with emery cloth until it becomes shiny. If still can not solve, use a very thin fuse and connect the three-phase four wires on the generator randomly. Then start the engine, the fuse will blow automatically, and the voltage will come up.

If you don't know the diode, open one of the iron rings on the back cover of the generator, and you can see two slip rings, then see the carbon sand. At this time, take a battery of any size, start the generator and hold the positive and negative terminals on the battery by hand, press and hold the two carbon sands corresponding to the slip ring. Do not remove until the generator voltage increases.

If it still doesn't work, exchange the positive and negative poles of the battery. If the voltage disappears immediately after removal, it indicates the diode is broken. Replace the diode.
标签：

Comments

Post a Comment

Popular posts from this blog

What Is the Difference Between Electric Motor and Electric Generator

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and winding currents to generate force. In certain applications, such as in regenerative braking with traction motors, electric motors can be used in reverse as generators to recover energy that might otherwise be lost as heat and friction. An electric generator operates in the reverse direction, converting mechanical energy into electrical energy. Electric generator can be divided into various type, open type, silent type, trailer type, portable type and container type, etc. Electric generator is mainly composed of diesel engine & alternator. Electric generator set is mainly composed of engine, alternator, control module, and common base. Electric generator :- Electric generator is a type of machine which converts mechanical input (energy) into electrical output (...
1 comment
Read more

Engine Fault Code Messages - Volvo Penta Engine

Volvo Penta Engine Fault Code When a malfunction has occurred and the diagnostic system has generated one or more fault codes, these are read out differently depending on the equipment used. Please refer to “Fault code messages”. If the system indicates that a fault code has been set: 1 Cut engine speed to idle, or shut the Volvo engine off. 2 For DCU/DU Read the fault code from the display, please refer to Reading fault codes via the DCU or Reading fault codes via the DU. For CIU press the diagnostic button and read the fault code, by observing the flashing of the diagnostic lamp. Refer to Reading fault codes via the diagnostic lamp, CIU. 3 Look up the fault code in the Fault Code Register chapter and take the recommended measures. Reading fault codes via the DU (Display Unit) Depending on the severity of the fault the text, either WARNING! or ALARM STOP (a buzzer sounds) will be shown on the display 1 Press any button to come to the fault list. The f...
Post a Comment
Read more

Main Structural Features of Natural Gas Engine - Weichai WP13NG Gas Generator

1.1 Main structural features of natural gas engine ● A cover per cylinder, dependable operation, easy disassembly. ● Frame-type main bearing structure and high complete machine rigidity which benefits the reliability and  service life of complete machine. ● Electronic throttle is adopted to control engine revolving speed. ● Mixture supply system uses mixer to regulate air-fuel ratio and adopts proportional mix and supercharged inter-cooling method to stabilize gas supply. ● Water-cooling middle case turbocharger applicable to gas engine features is selected and circulating  water shall be used to cool down turbocharger lubrication cooling oil so as to effectively prevent  pressure bearing lubricating oil from coking and to improve turbocharger’s reliability. ● Designed gas mixing system satisfies gas fuel features to effectively support stable lean burn and enhance thermal efficiency. ● Two pairs of friction couples of inlet, outl...
Post a Comment
Read more