Speed Regulation System of Heavy Duty Industrial Generator

by Starlight Generator dieselgeneratortech

Speed regulating System of Industrial Generator


The working principle of the speed regulating system: when the flywheel of a diesel engine rotates, the speed measuring head installed on the flywheel shell generates a pulse voltage signal, which is transmitted to the electronic speed governing board. If the speed is lower than the preset value of the electronic speed regulating board, the voltage output from the electronic speed regulator to the electronic actuator will increase, the oil supply of the pump will increase, and the speed of the diesel engine will reach the preset value.


Speed regulation system includes electronic speed control board, speed measuring magnetic head and electronic actuator.


The voltage of the electronic actuator is generally 6 to 8V DC, which increases with the increase of the load, and is 12-13V DC at full load.


At present, the diesel engine speed regulation system is represented by Cummins PT pump oil supply system and Perkins high pressure pump oil supply system. The commonly used speed regulating systems are EFC speed regulating board and ACT electronic actuator, GAC speed regulating board and electronic actuator. BARBERCOLMAN speed regulator and electronic actuator (the ground wire is the same as EFC). ACT electronic actuator DC resistance is about 8Ω, GAC electronic actuator DC resistance is nearly 16Ω, BARBERCOLMAN actuator DC resistance is nearly 2Ω. The voltage output from the electronic speed control board to the actuator is about 6-8V DC at no load.

MPU is a tachometer head, DC resistance value is between 50 to 300Ω, the induced voltage is more than 1.5V AC, the speed control board can work. Its installation mode is: clockwise to the end, then return to 3/4 to -1 turn, finally fix the screw.


"idle"means idle speed adjustment potentiometer, speed regulator board 7 and 10 short connection, the speed control board is in the idling mode; "RUN" or "speed" is the speed adjustment potentiometer, used to set the speed of the generator, "GAIN" shows the speed of the reaction time, the increase will stabilize the frequency, "droop" expresses speed drop. The larger the load, the more the speed drop.


The GAC speed control board has several models, such as ESD5111 and ESD5220, and the wiring method and principle are basically the same.


Speed: used as speed setting; Stability: used to adjust stability; GAIN: used to adjust the response speed;

Droop: used to adjust the speed drop (K, L must be short connection to achieve this function)

Idle: used to adjust the idle speed setting (G, M must be short connection to achieve this function)


GAC governor initial adjustment


Start the gen set, adjust the "speed" potentiometer to the rated speed (50Hz), adjust the "GAIN" potentiometer clockwise until the unit vibrates, then callback to no vibration and adjust counterclockwise 1/8 turn. Adjust the "STABILITY" potentiometer clockwise until the unit vibrates, then counterclockwise adjust back to no vibration, and then call back 1/8 turn. If the load is still vibrating, lower the "GAIN" slightly to no shock.


Common faults and troubleshooting of speed control system:


1. Frequency is unstable.


a) The electronic actuator has poor bearing or the pull rod is not flexible;

b) the speed control board GAIN is too small and the response is too slow;

c) speed measuring magnetic head problems;

d) There is interference on the ground line and the speed control board is broken;

e) diesel engine failure (There is air in the oil line);


2. Over speed


a) MPU speed measuring head is broken or the wiring is loose;

b) the electronic actuator is stuck;

c) the speed control board is broken;

d) Diesel engine failure (There is air in the oil line or oil return blockage)


Starlight Power Group has 43 experience years in the field of diesel generator manufacturing. Can provide 20KW to 2500KW standby/emergency/prime/industrial diesel generators with various types, including open type generator, silent generator, trailer generator with wheels and container soundproof generating sets, etc.


Annual production capacity: 30000 sets

Frequency: 50/60Hz

Brand: Cummins, Perkins, Volvo, Mitsubishi, Deutz, Yuchai, Shangchai, Doosan Daewoo, MTU, etc.

Delivery time: within 10 days after order confirmation

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About Starlight Generator Senior   dieselgeneratortech

188 connections, 3 recommendations, 660 honor points.
Joined APSense since, April 16th, 2017, From Guangxi, China.

Created on Apr 15th 2019 21:18. Viewed 231 times.


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