Controller Start Failure Analysis:
In many cases, when the user is starting engine, genset cannot start or start unsuccessfully. It is difficult to find problems due to users do not understand genset running principle and mechanical structure. This article gives a list of faults caused by starting problems in genset using.
Genset start failure is basically caused by the following ways:Electrical circuit、Mechanical structure、Controller parameter configuration.
Electrical Circuit
When electrical circuits or components have faults, starter may not work in genset starting, thus resulting in genset start failure.When troubleshooting electrical problems, you should first confirm that controller or start signal outputs correctly, then confirm whether the operation status of each relay or contactor and electrical circuit is normal according to electrical drawing or actual electrical wiring.
Mechanical Structure
Start failure cause by mechanical problems with the starter section may result in idling or gear collision. When starter is idling, the flywheel teeth of engine may be damaged. The starter gears do not engage the engine flywheel teeth, causing the starter to idle. In this case, engine flywheel teeth plate needs to be replaced and repaired.
When gear collision occurs, it is because the starter gear is engaged the flywheel teeth, so it is unable to start. In this case, you can try to start engine again. If it cannot start, then check starter and engine flywheel teeth plate.
Controller Parameter Configuration
When controller is used for start and stop control of genset, it can control starter running. The controller controls starter based on engine speed, oil pressure and genset frequency. When genset is starting, if controller measured data reaches certain condition, controller will control starter to stop.
Controller can set engine speed, oil pressure, gen frequency in starting, when one of them reaches set value, controller will consider that genset starts successfully and stop the starter, then genset will enter running status. When parameter setting or measured data has problem, control abnormal situation will appear, thus causing genset running fault.
The common fault phenomenon is that after pressing start key, genset has no action, controller displays “Genset Running”, then gen underfrequency, undervoltage or low oil pressure alarm will occur. A more common phenomenon is that when oil pressure is set in start conditions, if oil pressure value is greater than start success value in stopping, controller will assume that genset has started successfully in starting and enter running period. When it runs to monitor alarms, because genset is not really running, controller cannot detect normal voltage, frequency, oil pressure and speed, and will issue alarm after judging.
When this condition appears, we need to check controller parameter display and parameter setting about start, making related parameter in rational setting range.
