Types of Diesel Generator Governor or Speed Control Board
Governor Cummins Power QST30
The Cummins Power Governor QST30 or Cummins Governor 4725-300 A(38) board with PCC 3100 control board is a Power Command control system that receives a low-power PWM signal with a pulse width of 3KHz from the engine by the A31 module. In fact, the Cummins Power Governor QST30 controls the two fuel pump actuators (left and right) via a 200Hz PWM output with feedback control.
Also, the Cummins Power QST30 governor has a voltage of 0-5 VDC for the position of the right and left actuators, which is also used to troubleshoot the actuator.
The Cummins QST30 speed control board has two connecting sockets:
J6: Engine Interface Board
J13: Right and left actuator position and power signals.
The Cummins Power Governor's QST30 has four Fast fuses, two of which are 10A in the power path and two of which are 15A in the actuator path to protect against overload and ground error.
The Cummins Power QST30 Governor has six LEDs to indicate the following statuses:
DS1: The green LED indicates that the Cummins Power QST30 Governor is active.
DS2: The green LED indicates that the 5VDC power supply is active.
DS3: The green LED indicates that the left actuator is active. The Deuty Cycle range on the PCC control board is between 25% – 93%. It should be noted that at the time, the maximum Deuty Cycle is around 63%. Note that the brighter the LED, the larger the Deuty Cycle.
DS4: The actuator is on the right. The Deuty Cycle range on the PCC control board is between 25% – 93%. It should be noted that at the time, the maximum Deuty Cycle is around 63%. Note that the brighter the LED, the larger the Deuty Cycle.
DS5: The red LED indicates the left actuator error. If the actuator is more than 1.5mm from its steering position, the fault LED will illuminate. Note that the actuator has a maximum movement of 0-21 mm.
DS6: The red LED indicates the right actuator error. If the actuator is more than 1.5mm from its steering position, the fault LED will illuminate. Note that the actuator has a maximum movement of 0-21 mm