800kw Cummins Generator Electronic Speed Control System 1

The 800kw Cummins generator electronic speed control system (EFC) is the main control mechanism for controlling fuel supply in the PT fuel system, which can achieve automatic control of diesel engine speed. The system is mainly composed of actuator, speed control controller and electromagnetic sensor. The speed control controller has two kinds of speed control systems: normally open and normally closed.

The electromagnetic sensor detects the speed of the diesel engine on the flywheel ring gear and feeds back the AC signal to the speed controller. The speed controller compares this signal with the original parameters of the speed controller. If two values are different, the speed controller will change the current sent to the actuator, causing the throttle shaft of the speed controller to rotate by an angle, thereby changing the amount of fuel supplied to the diesel engine, resulting in corresponding changes in the speed and power of the diesel engine.

(1) The composition of the speed controller. Once the electromagnetic sensors and actuators of the electronic speed control system malfunction, it is difficult to repair and the only option is to replace the assembly. Early Cummins generator sets had relatively independent control systems for their diesel engine and generator, with two control panels. In recent years, Cummins generator sets have integrated diesel engines and generator control panels. No matter how the control panel changes, the speed controller of the electronic speed control system always exists, and there are four potentiometers available for adjustment.

1. Gain potentiometer: A gain potentiometer is a rotary potentiometer that can only be rotated once, mainly used to adjust the sensitivity of the speed controller. Rotate the potentiometer dial clockwise to shorten the response time of the speed controller to the load; Turning counterclockwise will prolong the response time of the speed controller to the load.

2. Speed droop potentiometer: The speed droop potentiometer is also a rotary potentiometer that can only be turned once, and can achieve speed droop adjustment within the range of 0% -5%. Turning the potentiometer dial clockwise will increase the speed drop, otherwise it will decrease the speed drop.

3. Idle potentiometer: The idle potentiometer is a rotary knob type potentiometer that can be rotated 20 times to adjust the operating speed of the diesel engine during idle. Turning clockwise will increase the idle speed, otherwise it will decrease the idle speed.

4. Empty high-speed potentiometer: The empty high-speed potentiometer is also a rotary potentiometer that can be turned 20 times to adjust the required unloaded high speed. Turning clockwise will increase the maximum no-load speed, otherwise it will decrease the maximum no-load speed.

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