Analysis of several reasons why diesel generators cannot be started and countermeasures

When the power is interrupted, the standby generator set can usually bring us a continuous and stable power supply. However, since the standby generator set does not run frequently, if the user does not pay attention to regular test operation and regular maintenance, it is very likely that the power supply needs to be supplied. At that time, the diesel generator set could not start normally. Let's take a look at several reasons why the diesel generator set cannot start normally and how users should deal with such situations.

 

When the power is interrupted, the standby generator set can usually bring us a continuous and stable power supply. However, since the standby generator set does not run frequently, if the user does not pay attention to regular test operation and regular maintenance, it is very likely that the power supply needs to be supplied. At that time, the diesel generator set could not start normally. Let's take a look at several reasons why the diesel generator set cannot start normally and how users should deal with such situations.

 

1. Battery failure

One of the most common reasons for diesel generators not starting is battery failure. This can usually be caused by loose connections or sulfation (buildup of lead sulfate crystals on the plates of a lead-acid battery). When the sulfate molecules in the electrolyte (battery acid) are discharged too deeply, it can lead to fouling on the battery plates, preventing the battery from supplying enough current.

A battery failure can also be caused by an open charger circuit breaker being inoperable, usually due to a failure of the battery charger unit itself or a tripped circuit breaker for AC power. At this point the charger has been turned off and not turned on again, which often happens after repairs or maintenance have been carried out. After service or maintenance, always check the generator system again to make sure the charger power circuit breaker is in the correct position.

Finally, battery failure can be due to dirty or loose connections. Connections need to be cleaned and tightened regularly to prevent potential failures. Tingbo Power recommends that you replace the battery every three years to reduce the risk of failure.

 

Second, the coolant level is low

Without radiator coolant, the engine would quickly overheat, leading to mechanical failure and engine failure. The coolant level should be checked regularly and visually inspected for coolant puddles. The color of the coolant varies by manufacturer, but it usually looks red.

An internally clogged radiator core can also cause a low coolant level shutdown. When the generator is running under load, when the engine reaches optimum operating temperature, the thermostat is fully open, which means that the radiator cannot allow the right amount of flow through. Therefore, the coolant escapes through the overflow pipe. When the engine cools down and the thermostat closes, the fluid level drops and the low coolant level starts the generator shutting down. Because this only happens when the generator reaches optimum operating temperature under load, it is recommended that you test the generator with an external load bank that is loaded enough to reach the temperature required to open the thermostat.

 

3. Poor fuel mixture

Usually, the reason why the generator won't start is fuel related. Poor fuel mixing can occur in a number of ways:

When you run out of fuel, the engine receives air, but no fuel.

The air intake is clogged, meaning there is fuel but no air.

The fuel system may be supplying too much or too little fuel to the mixture. Therefore, normal combustion in the engine is not possible.

Finally, there may be impurities in the fuel (i.e. water in the fuel tank) that prevent the fuel from burning. This often occurs when fuel is stored in the tank for a long time.

Top Power Reminder: As part of the regular service of any backup generator, the best practice is always to test the fuel to make sure it won't cause a failure in the future.

 

Fourth, the control is not in automatic mode

When your control panel displays the message "Not in Auto Mode" this is the result of human error, usually due to the main control switch being in the off/reset position. When the generator is in this position, the generator may not start in the event of a power outage.

Periodically check the generator control panel to make sure that the message "Not in automatic mode" is not displayed. Many other faults displayed on the control panel can prevent the generator from starting.