How to Adjust Volvo Diesel Generator Electronic Governor

by Starlight Generator dieselgeneratortech

Adjustment of the electronic governor after starting

A. After starting Volvo generator set, the engine runs at idle speed (about 400 rpm), and the idle speed (IDLE) potentiometer is turned clockwise to increase the idle speed. This potentiometer is single turn. Therefore, the adjustment should be carried out carefully and the potentiometer must not be turned to the maximum position.

Warning: Prolonged operation at very low speeds can damage the elastic coupling/engine/generator.

B. After confirming that the engine is working properly, remove the connection of the L and M terminals and the engine speed rises to approximately 1567 rpm.

C. Final adjustment


The engine is idling and the gain (GAN) potentiometer is turned clockwise until the engine starts to be unstable. Then return the potentiometer to the engine to resume stability, and then continue to retreat 1 / 8 circle.


Adjust the stability in the same way as above (STABILITY)


Note: When adjusting the gain potentiometer, the preset engine speed may change, so the engine speed should be adjusted by the SPEED potentiometer to 1567 rpm (52.2HZ on the frequency meter).


After the above speed adjustment is completed, the load can be applied. Under normal circumstances, these adjustments have a critical point when the machine is cold, so it may need to be adjusted again.


Rotating the gain (GAN) potentiometer clockwise will increase the response speed of the governor to load changes, and counterclockwise decrease the governor reaction speed.


Clockwise rotation stability (STABILITY) potentiometer shortens the recovery time of the speed control system after the load changes, and increases the recovery time counterclockwise.


Volvo generator voltage regulator data and excitation system wiring diagram


 Volvo generator's automatic voltage regulators AVR and D202, all of its components are mounted on a printed circuit board, the lead wire is connected to the outside through multi-core connectors or bolts, can be installed in the junction box, also It can be removed from the machine and installed in the control panel. When removing the machine, special attention should be paid to adjusting the ventilation and cooling of the AVR.


1 Exciter field winding

2 Exciter rotor winding

3 Rotary rectifier

4 Generator field winding

5 Generator set stator winding

6 Auxiliary winding

7 Tolerance transformer

8 Tolerance potentiometer

9 Remote voltage adjustment potentiometer

10 Third harmonic winding


RP1Voltage regulation

RP2Stable adjustment

R1: integral time constant adjustment

RP350Hz frequency inflection point adjustment (K2 open)

RP4Voltage down regulation at 50Hz or 60Hz

RP560Hz frequency inflection point adjustment (K2 on) 3.6.1 can be used in 50Hz and 60Hz generators. For 60Hz generators, the K2 switch is placed in the "ON" position (ie, the off position).

Measure the transformer input voltage to 400 volts (also 230 volts), short-circuit and overload protection for rapid blown 10A, 5 seconds (this fuse is mounted on the regulator board). When the load buffer function and U/f=constant function are required, the K3 switch is placed in the “ON” position. When these two functions are not required, the K3 switch is placed in the “OFF” position. When remote voltage regulation is required, disconnect the short-circuit between RV1 and RV2 and connect a KΩ potentiometer (multi-turn potentiometer is recommended). N1, W1 is short-circuited at the factory. If there is parallel operation requirement, fold the short wiring, and connect the difference adjustment device at the two ends (the device is composed of a current transformer and a potentiometer and connected). The current transformer has a sideband capacity of 1VA, a current of 1A, and a potentiometer of 20W5Ω. Note that the current transformer of the adjustment device cannot be connected to the same phase of the voltage measurement transformer of the AVR. For example, the voltage measurement transformer of the AVR is connected to the V-W phase, and the current mutual susceptor for the adjustment should be connected to the U phase.

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About Starlight Generator Senior   dieselgeneratortech

191 connections, 3 recommendations, 675 honor points.
Joined APSense since, April 16th, 2017, From Guangxi, China.

Created on Jan 18th 2019 03:05. Viewed 396 times.


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