DEEP SEA ELECTRONICS DSE8610 MKII - Operation

Operation
057-254 ISSUE: 10
Page 162 of 246
5.12.3 OPERATION
Before the generator sets are started, their load switches are closed. As there is no AC supply the
load switches must be DC controlled. Next, the alternator excitation field is disabled by isolating the
supply to the AVRs. The engines are all started at the same time and allowed for the Excitation Delay
timer to reach the desired operating speed. As there is no AC supply generated, frequency cannot be
used to determine engine speed, hence the requirement for an MPU of CAN speed signal.
If the engines have attained the desired engine speed within the Excitation Delay timer, the AVR’s
power supply is reconnected, enabling the excitation field and load sharing begins. The MSC link is
used to ensure all sets excite their alternators at exactly the same time. Any generators not up to
speed before the end of the Excitation Delay timer are instructed to open their load switches. A short
time later, these sets synchronise to the bus in the traditional manner.
Status
Start Delay
00:00 s
Status
Fuel
Status
Crank Attempt
Status
Excitation Delay
L-N 0 V
L-L 0 V
kW 0 kW
00:03
0 A
0 Hz
0 pf
Status
Excitation Delay
L-N 230 V
L-L 400 V
kW 100 kW
00:00
174 A
50 Hz
0.8 pf
Status
On Load
Excitation output closed & voltage
rises to nominal settings.
Once the voltage and frequency are within
configurable limits the set(s) can take load.
The generator load switch is
closed, excitation is switched
off, start delay if configured.
Fuel output is activated
Engine is cranked
Excitation Delay before excitation output is activated.
Generators run up to speed if any on the MSC are out of
limits they are instructed to open their load switches and
synchronise in the normal manner.