Cause Iinvestigation of Diesel Generator Sets not Starting Normally
by Starlight Generator dieselgeneratortechAccording to the relevant technical information, the model of the electromagnetic actuator of Cummins diesel generator is ADC100, and the working voltage at the moment of starting should be greater than 10 V. The operating voltage of the electromagnetic actuator at the moment of starting the diesel engine measured on site is 9.3 V, which is less than the minimum working voltage. Therefore, the fundamental reason for judging that the high-pressure fuel injection pump does not produce fuel is that the voltage of the throttle solenoid valve in the control circuit part is too low at the moment of starting, and the fuel cannot enter the high-pressure fuel pump. When the output voltage of the speed control controller is too low, it is necessary to determine whether the control circuit of the speed control controller is faulty or the working power supply voltage is low.
By consulting the relevant technical data, it is known that the working power of the speed control controller comes directly from the diesel generator battery. When the battery capacity of the diesel engine is insufficient, the battery voltage is low at the moment when the diesel engine starts, and it cannot provide enough power to the speed control controller. The voltage output from the actuator to the electromagnetic actuator is lower than 10 V, and the solenoid valve cannot be opened normally, resulting in the inability of the fuel to be delivered to the engine combustion chamber, thus causing the diesel generator to fail to start normally, and the voltage of the speed controller measured at the moment of starting is 10.9 V.
So far, the reason why the Cummins diesel generator set used by the user could not start normally has been identified, and the direct reason is that the battery capacity is insufficient. Because the battery has been used for a long time and the capacity is seriously reduced, the voltage at the moment of starting the oil engine is low, and the required voltage value cannot be provided for the solenoid valve to work. As a result, the solenoid valve cannot be opened normally, and the fuel cannot be delivered to the combustion chamber of the engine, resulting in the failure of the oil engine. start up.
Summarize:
The direct reason that the Cummins diesel generator set cannot be started is the insufficient battery capacity, but the process of determining the cause is long. First, measure the battery voltage with a multimeter. Secondly, after the battery is charged, the voltage across the battery is measured by a multimeter, and the result is within the normal range, and the cause of the battery is ruled out. Finally, the diesel generator set had an overspeed phenomenon during the first failure, and the oil engine had an overspeed warning, so more attention was turned to troubleshooting the fuel system.
Jiangsu Starlight Power reminds:
Diesel engine batteries are start-up batteries with a general service life of 3 years. If they are used for more than 3 years, consider replacing them with new batteries. The battery voltage measured by a multimeter cannot fully and correctly reflect the capacity and performance of the battery, and other tools such as battery internal resistance tester are needed.
The above is the entire content of the maintenance case analysis of the Cummins diesel generator set that cannot be started normally. I hope to inspire the majority of users.
Jiangsu Starlight Electricity Equipments Co.,Ltd. is one of the earliest manufacturers of generators and diesel generator sets in China. The company was established in 1974 and the company occupies an area. With an area of 86,000 square meters and a building area of 45,000 square meters, it has 64 sales and service departments across the country to provide users with one-stop service of design, supply, debugging and maintenance at any time. Welcome customers to come to consult and visit. Looking forward to your inquiry, please send email to us for details sales@dieselgeneratortech.com
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Created on May 25th 2022 20:40. Viewed 224 times.