Diesel generator set fault diagnosis

Introduction

Diesel generator set by diesel engine, ac synchronous generator, control panel and chassis, coupling, radiator, fuel tank, etc.Some still hold mufflers and casing.Method using direct connection between axis of diesel engine and generator.Usually, also on the spindle is equipped with the flywheel to increase running smoothly.Diesel generating set is usually supplied by manufacturer's assembly for complete set;Also have a plenty of according to power load and its characteristics, and determine the capacity of the generator and the Numbers, then choose diesel engines for driving the generators.Fuel system and starting air system equipment can configure each individual, can also more centralized configuration unit.

PLC control system

The composition of PLC control system, the control system of the input signals have start charging the battery, battery charged stop signal, mains failure (including voltage and frequency within the prescribed scope) signal, the unit start-up success signals, rated speed of unit, unit, unit low frequency and high speed signal, under voltage and over voltage signal of the unit, the unit of overload signals over temperature, cooling water, lubricating oil pressure too low signal, system with short circuit signal, fault reset signal and stop signal, etc

The main function

Automatic diesel generating set as a standby power, should have the following basic functions

Automatic startup

When the mains failure (power), under voltage, over voltage, lack of phase, the unit will start automatically, automatic speed, automatic switching, supply power to the load.

Automatic stop

When the mains recovery, after judge normal control switch, complete the automatic switching power to the grid, and then control unit speed down, automatic stop idle run 3 minutes.

Automatic protection

Units in the process of running, if there is a low oil pressure, speed, voltage abnormal failure, emergency stop, send out sound and light alarm signal at the same time, if there is a high temperature, high oil temperature of failure.Send out sound and light alarm signal, after a time delay, the normal downtime.

Three times start function

Unit three times start function, if the first time you start is not successful, after 10 seconds delay time to start again, if the second start-up is not successful, the time delay for the third time after launch.Three times as long as there is a successful start, according to a preset program run down;If three consecutive start is not successful, then as a boot failure, send out sound and light alarm signal, also can control the other units starting at the same time.

Maintain accurate start state automatically

The unit can automatically maintain must start state.At this point, the unit automatically periodic automatically in the process of the oil supply system, oil and water heating system and battery charging devices to work automatically

Have maintenance boot function

When the unit for a long time did not start, maintainability can be switched on, in order to check the unit performance and status.Boot does not affect the normal power supply mains, maintainability in maintainability boot if mains failure, the system will automatically to normal on and the power supply unit.

Have two kinds of manual and automatic operation mode

Diagnosis case

Remote fault diagnosis - the black box patent technology

Example: when the generator set start failure problems, manufacturers and technical personnel through the PC or cell phone APP, quickly check user unit in the process of starting failure every second data (with the fault diagnosis of the demo APP), such as: the boot process speed is how much?The oil pressure to achieve?The battery voltage reduce how much?How much is the charge of mechanical and electronic pressure....Technical personnel through the data can be easily remote some troubleshooting, for some simple failure or user improper use, can be solved quickly.

Through the remote fault diagnosis, reducing for fault situation of communication between manufacturers and users, manufacturers directly through the cloud server get 18 seconds of black, rapid analysis of the cause of the problem, rapid troubleshooting, reduce after-sales service costs, improve service efficiency and quality.

Mobile terminal remote fault diagnosis display

No matter when and where, after-sales service for users with mobile phones can remote fault diagnosis, guide users to exclude simple fault.Record every second moment before failure data, include: engine, generator data, load data, I/O port state, to observe which parameters will do

Maintenance

Diesel generating set is limited to the following maintenance methods:

For four leakage phenomenon, the surface of the unit, start, battery, oil and fuel such as check;

Clean room environment improvement, regular replacement :

Every month for no-load, every six months and maintenance load of commissioning, etc;

Using real-time observation electric power monitoring quality parameters

The existing maintenance means limitations:

Maintenance of existing load test is only to the back-end existing load testing of electrical equipment, there is a certain risk, and low power

Or to replace a/after overhaul without scientific basis

Or after major repair, replace a/there is no specific load to load commissioning, do not know whether can achieve expected purpose

No-load commissioning and small power load to produce large amounts of carbon

Diesel generator is a kind of independent power generation equipment, mainly to provide emergency power supply during blackout.In fact, the unit is in standby state, most of the time actually less chance to be put into use, give priority to with commissioning more at ordinary times, the lack of a perfect means of detection and maintenance.But the emergency standby power is indispensable.How to do the generator in use less usual circumstances, the emergency power supply timely, safe and reliable operation, can immediately following the end of power outage.

First, the battery pack.Due to the standby power supply is not often put into use, the generator whether can normal boot, the key lies in the maintenance of the battery.The problems such as the battery pack, more common situation is that there are voltage and current, then start the motor could be heard inside the solenoid valve and voice, but with fixed axis.Battery problems lead to can't stop for three reasons: 1. During commissioning with the method of stop for the battery, can lead to inadequate battery.2. Adopt mechanical oil pump by the belt transmission, under the rated speed of oil pump is very large, lack of battery power supply, however, lead to stop the shut off valve spring leaf due to electromagnetic valve in the suction is not and cannot be shut out of the four oil hole jet fuel, can't stop.3. Domestic battery life for two years, usually without change on a regular basis.

Second, start the solenoid valve.Generator at run time, the people come to the conclusion that "a see, two, three, four smell" a set of inspection methods.Start listening to, is a very important step.Original cummins generators in the United States, for example, just press the start button, after three seconds, you can start.Three seconds in the two "clicking" sound can be heard.Once you hear the second ring, start check electromagnetic valve is working correctly, if the electromagnetic coil burn out, generator cannot start, of course

Third, diesel oil, lubricating oil.For a long period of static unit, the unit itself is with the oil of various materials, cooling water, diesel oil, air and other complex chemical and physical changes, which will be "bad" unit.Oil should be paid attention to this problem.For fire safety are usually put diesel fuel tank in a closed room, because of the atmosphere water vapor condensation occur because of the change of temperature, forming water attached to the tank wall, into the diesel, the diesel fuel moisture content exceeds bid, the diesel oil into diesel engine high pressure oil pump, will rust precision coupling --, plunger, serious damage to the unit.Generator of lubricating oil is a shelf life, long time storage, physical and chemical properties of lubricating oil change, cause the unit work lubrication condition deteriorates, easy to cause damage of generator parts.