English 
2nd gen cummins speedometer not working
Four potentiometer are installed on the panel of the EFC speed control controller. W1 is the idle speed adjustment potentiometer (IDLE SPD), W2 is the running speed adjustment potentiometer (RUNSPD), and W3 is the gain adjustment electric. GAIN and W4 are speed droop adjustment potentiometer (DROOP). These potentiometer are used for system adjustment.
1. Initial commissioning (without starting diesel generator)
(1)Turn the idle speed potentiometer W1 counterclockwise for 20 cycles, and then clockwise for 10 cycles to place it in the middle position.
(2) Turn the running speed potentiometer counterclockwise for 20 turns, then clockwise for 10 turns, and place it in the middle position
(3) The gain potentiometer W3 is used to adjust the sensitivity of the governor, that is, the response time of the governor to the load. Adjust it to scale 50.
(4) Adjustment of speed droop potentiometer W4. As the load increases, the steady speed of the diesel generator will decrease, and the speed with load is lower than that without load, which is expressed as the percentage of speed at full load. Is the speed drop. Namely, the speed drop=(no-load running speed - full load speed) * 100%/full load speed The potentiometer has three settings: ① counterclockwise turning to the end is synchronous operation. ② Go to scale 50. Obtain a 3% speed drop at Turn to scale 80 and obtain a 5% speed drop. When selecting 2 and 3 to set the day, the potentiometer should be adjusted to the middle of the adjustment range.
System tuning:
(1) Idle speed adjustment: set the running/idle speed switch to the idle speed position, start the diesel generator, and adjust W1 until the special speed of the vehicle is 600~650r/min.
(2) Running speed adjustment: set the running/idle switch to the running position, and start the diesel generator for no-load operation. ① When W4 operates synchronously, adjust W2 to a speed of 1500r/min (corresponding to 550Hz) stop. ② When W4 is set to a 3% speed drop, adjust W2 to a speed of 1545r/min (corresponding to 515Hz) until ③ When W4 is set to a 5% speed drop, adjust W2 to a speed of 1575r/min (corresponding to 52.5Hz) Stop.
(3) Gain adjustment: start the diesel generator and connect about 1/4 of the rated load. If the speed of the diesel generator L is stable, slowly rotate W3 clockwise until the diesel generator can not rotate stably, and then slowly rotate W3 counterclockwise until the speed is stable.
(4) Adjustment of speed drop: start the diesel generator, add the rated load, and adjust W4 until the frequency is 50Hz, i.e. 1500 r/min.
(5) System adjustment: After performing step (4) adjustment, remove the load, perform step (2) adjustment, and then add the rated load to perform step (4) adjustment until the correct value is reached. In order to obtain the correct speed (i.e. frequency), it is usually necessary to repeat the above method for two to three consecutive adjustments to make the system correct.
Get a Quote / Info