Our company produces generator
sets, some of which are equipped with mechanical governors and some with
electronic governors. Both speed governors can guarantee the power quality
absolutely, but the generator set equipped with electronic governor realizes
automatic protection and automatic control is very convenient. The electronic
governor of diesel generator set has been adjusted and the user does not need
to do this. However, after the engine overhaul or the fault that affects the
operation of the electronic governor, it needs to be adjusted. The electronic
governor control unit is mounted in the control box at the top of the
generator.
A. Turn switch C1 to the engaged
position. If there is rapid ride during the engine running, turn C2 to the
(OFF) position.
B. Turn switch C2 to the engaged
position.
C. Turn the gain (GAN) and
stability potention meters to the middle position.
D. Temporarily connect terminals
L and M together.
Adjustment
of the electronic governor after starting
A. After starting the 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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