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Analysis of Diesel Generator Set Starter Working Failure

Sep. 17, 2021

There are many failure phenomena of diesel generators that cannot be started: the first case is that the starter rotates at a high speed after the start button is pressed, but the starter gear and the flywheel ring gear of the diesel generator set clash, causing the diesel generator set to fail to start; The second situation is that after the diesel generator set is started, the starter gear rotates with the flywheel of the diesel generator set, and the starter gear cannot return.


A 6135AZD 120kw diesel generator set. After the diesel generator set is started, the starter continues to work. Failure analysis:


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The reason why the starter continues to work after the diesel generator set is started is generally that the movable contact inside the magnetic switch is sintered with the static contacts of the two terminals, so that the main circuit of the starter is connected and the starter continues to work. This kind of failure usually occurs in winter, because the internal temperature of the diesel generator body is too low in winter, the number of starts is many, and the interval is short, and it is easy to cause the fault that the moving contact and the static contact are sintered together.


For example, the DC voltage allowed by the magnetic switch of the 6135 diesel generator set is 24v. When starting the diesel generator set in winter, in order to meet the starting requirements, two sets of battery packs composed of two 6Q-195 batteries in parallel can be connected in series. Get up and start the diesel generator set (the purpose is to start the diesel generator set by increasing the battery capacity under the condition of the same voltage). If the diesel generator set operator connects 4 6Q-195 batteries in series and starts the diesel generator set by increasing the voltage, then, since the magnetic switch requires 24v DC voltage to start, the 48v battery pack is used to start the diesel generator set. , It is easy to sinter the movable contact and the static contact of the magnetic switch together. Therefore, this method is generally not allowed to start diesel generator sets.


Troubleshooting method:


(1) When starting the diesel generator set in winter, fill the water radiator with hot water or antifreeze.


(2) Change to winter oil.


(3) Manually crank the flywheel of the diesel generator set before starting.


(4) When 4 batteries must be used for starting, two batteries must be connected in parallel and then connected in series with two batteries in parallel (when the battery power is insufficient, this method can be used to start the diesel generator set).


(5) After replacing the magnetic switch, the starter works normally and the fault is eliminated.


Jiangsu Starlight Power Generation Equipment Co., Ltd. was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. The company has a registered capital of 218.88 million yuan. The company covers an area of 86,000 square meters and a building area of 55,000 square meters. There are more than 660 employees, including 456 professional technicians and 106 senior technicians. It has 46 sales and service outlets nationwide. The main products are diesel engines, generator sets, and diesel generators, providing users with a one-stop service of design, supply, debugging and maintenance at any time. Starlight has always insisted on using first-class talents, building first-class enterprises, manufacturing first-class products, creating first-class services, and making every effort to build a first-class domestic enterprise. If any question please feel free to visit our website https://www.dieselgeneratortech.com/ or send email to sales@dieselgeneratortech.com.

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