How to Adjust Volvo Diesel Generator Electronic Governor
by Starlight Generator dieselgeneratortechAdjustment 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
RP1: Voltage regulation
RP2: Stable adjustment
R1: integral
time constant adjustment
RP3: 50Hz frequency inflection point adjustment
(K2 open)
RP4: Voltage down regulation at 50Hz or 60Hz
RP5: 60Hz 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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Created on Jan 18th 2019 03:05. Viewed 370 times.