Working Principle Of Speed Governing System Of Cummins Diesel Generator Set

The electronic speed governing plate, speed measuring magnetic head and electronic actuator constitute the speed governing system of Cummins diesel generator set. Its working principle is: when the diesel engine flywheel rotates, the speed measuring head installed on the flywheel housing generates a pulse voltage signal, the voltage value exceeds 1.5VAC, and this voltage value is transmitted to the electronic speed governing board. If the speed is lower than the preset value of the electronic speed governing plate, the pressure output from the electronic speed governing plate to the electronic actuator will increase, and the oil supply of the PT oil pump will increase accordingly, so that the speed of the diesel engine reaches the preset value of the electronic speed governing plate.

1. Speed measuring head.

The coil of the speed measuring head can be tested on the two terminal blocks of the coil with the ohm scale of a multimeter. The resistance is generally 100-300 ohms. The terminal block shall be insulated from the housing of the speed measuring head. When the Cummins generator operates normally, the AC voltage gear shall be used for detection, and the voltage output shall exceed 1.5V.

When installing the speed measuring magnetic head, turn any tooth of the flywheel and the disc unit to the center of the mounting hole of the speed measuring magnetic head, and then gently screw the speed measuring magnetic head in. After the speed measuring magnetic head contacts the tooth, turn it back 1/3-3/4 circle counterclockwise, and finally fasten the speed measuring magnetic head with a nut.

2. Electronic actuator.

The coil of the electronic actuator can be tested with the ohm gear of the multimeter on the two terminals of the coil. The resistance is generally between 7-8 ohms. When the power generation is about to run with no load, the voltage value transmitted from the electronic speed governing board to the electronic actuator is generally between 6-8VDC, which will increase with the increase of load, and generally between 12-13VDC when the power generation is full load.

When the Cummins generator is unloaded, if the voltage value is lower than 5VDC, it indicates that the electronic actuator is excessively worn and needs to be replaced.

When Cummins generator is loaded, if the voltage value is higher than 15VDC, it indicates that the PT oil pump has insufficient oil supply.

(1) The electronic actuators are divided into normally closed and normally open ones according to the working operation mode. Normally closed actuators are generally used (that is, the oil hole of the actuator is closed when power is unavailable). Normally closed actuators must be equipped with normally closed electronic speed governing plates.

(2) Electronic actuators can be divided into high flow actuators and image flow actuators according to flow. Low flow actuators can be used for LTA10, N series and K19 series, and high flow actuators can be used for VTA28, KTA38 and KKTA50 series.

3. Electronic speed governing board.

Cummins LTA10, N, K19, VTA28, K38, K50 series can use 3044196 electronic speed governing plate, which can also be replaced by American BARBER-COLMAN or American GAC GSD5221, GSD5220, GSD5520 series electronic speed governing plate.

During normal operation, the "DROOP" on the electronic speed governing board is adjusted to the "0" position. "SPEED" is the speed regulating knob of Cummins generator, and "IDLE" is the idle speed adjusting knob of Cummins generator. When it is rotated clockwise, the speed will increase.

When the two knobs "SPEED" and "IDLE" are out of order, the two knobs can be rotated clockwise for 20 turns, and then counterclockwise for 10 turns, which is the middle position of the knobs. At this time, turn the "SPEED" or "IDLE" knob clockwise or counterclockwise according to the running speed of the diesel engine.

The above is the working principle of the speed regulation system of Cummins diesel generator set introduced by Jiangsu Starlight Electricity Equipments Co.,Ltd. I hope it can help you. In recent years, Jiangsu Starlight Electricity Equipments Co.,Ltd. has conducted extensive cooperation with Cummins generator set, Shangchai generator set, Yuchai generator set and other companies in the United States, and can provide 15KW-2500KW generator sets of various specifications. For more details, please contact us with sales@dieselgeneratortech.com.