Electrical System of Volvo Generator
by Starlight Generator dieselgeneratortechEstablishment of magnetic remanence
The generator is established by
self-excitation of exciter remanence and has been magnetized when it leaves the
factory. However, due to storage, transportation, vibration, and the reason may
lose magnetic and can not build pressure, this time need to be remagnetized.
Magnetization method: at rated speed or close to rated speed, the 6V DC power
supply is connected to the magnetic field winding terminal E / E of the roller
machine. Power positive E, power negative E -, lasting 1-2 seconds.
Electrical
System
The control panel of the
professional Volvo generator set produced by British Deep water Company has the
characteristics of compact structure, beautiful appearance, superior performance,
reliable quality and so on.
(1) Manual control screen DSE501K
The DSE501K manual control screen
is a manual start / stop control screen. The control screen adopts foreign high
quality components, small volume, high reliability, beautiful appearance,
strong protection function, overspeed and high water temperature. The oil
pressure is too low and has the function of acoustooptic reverse alarm, and
has battery voltage and normal operation index.
Panel
diagram of DSE501K control cabinet
1. Voltage meter 2. Frequency
table 3. Ammeter
4. Voltage conversion switch 5.
Timer 6. 501K control 7. Water thermometer
8. Oil pressure gauge
1. Emergency shutdown
2. The oil pressure is too low.
3. The temperature of the water
is too high.
4. Overpeed
5. Charger fault
6. Key switch: stop / operation bit / start bit
(2) description of operations
Startup and shutdown are carried
out by operation 501K.
Turn on: when all the starting
work is ready, turn the electric key to the operating position, and then to the
starting position, then start the motor running about 2-4 seconds, diesel
engine operation, release key switch automatically back to the operating
position, start successfully. Set the generator set to rated speed through
governor or electronic governor.
Stop: turn the key to off
position
Switch: by turning the switch,
you can choose different phase voltage and line voltage.
Electronic
governor pre-adjustment
Some of diesel generator set
installs mechanical governor, others installs electronic governor. Both kinds
of governor can guarantee the quality of electric power absolutely, but the
generator set equipped with electronic governor is very convenient for
automatic protection and automatic control.
All electronic governor of our
generator set are adjusted, users do not need to do this work. However, after
engine overhaul or failure repair affecting the work of electronic governor,
adjustment is needed.
The electronic governor control
unit is installed in the control box of the upper part of the generator.
A. Dial the switch C1 to the ON
position. If there is a fast traffic phenomenon when the engine is running,
dial C2 to (OFF) position.
B. Dial the switch C2 to the on
position.
C. Transfer the "gain"
and "stability" potentiometers to the middle position
D. Temporarily connect terminal L
and M together
Adjustment
of Electronic Governor after starting
A. After starting the generator
unit , the engine is operated at idle speed ( about 400 rpm ) , and the idle
speed can be increased by rotating the idle ( IDLE ) potentiometer clockwise .
The potentiometer is of a single turn type . Therefore , the adjustment should
be carefully performed , and the potentiometer should not be rotated to the
maximum position .
Warning! Running at very low
speed for a long time will damage elastic coupling joints, engines, generators!
B. After knowing that the engine
is working normally, the engine speed rises to about 1567 revolutions / min by
removing the connection of the Lom terminal.
C. Final adjustment
Engine idling, clockwise rotation
gain (gan) potentiometer until the engine began to unstable. Then back the
potentiometer to the engine to work stable, and then back 1 / 8 laps.
Adjust
stability in the same way as above
Note: when the gain potentiometer
is adjusted, the preset engine speed may change, so the speed (speed)
potentiometer should be used again to adjust the engine speed to 1567 rpm / min
(reading 52.2 Hz on the frequency meter).
After the above speed regulation
is completed, the work can be added to the load. In general, these adjustments
have a critical point when the cooler is empty, so it may need to be adjusted
again.
Note:
The clockwise rotation of gain
(gan) potentiometer will increase the speed of the governor's response to the
load change, while the counterclockwise direction will decrease the speed of
the governor's response.
Clockwise rotation stability
(STABILITY) potentiometers shorten the recovery time of the governor system
after load changes, and increase the recovery time in counterclockwise
direction.
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Created on Oct 23rd 2018 01:41. Viewed 290 times.