EGCP-2 Engine Generator Control Package
Manual 26174
136
Woodward
TIME
A
B
C
D
E
F
G
H
J
100%
K
L
M
65%
25%
SYSTEM
LOAD
VIS-114
00-04-27
Figure 5-9. Typical Automatic Sequencing Scenario
Point A
Master Generator carrying load isochronously on an isolated bus. System load
steps from approximately 10% to 30%.
Point B
Master Generator responds to a step load that brings the system load to
approximately 70%. This level exceeds the Max. Gen Load set point (65%) in the
Sequence and Comms tuning menu. The Master control begins timing for the
Next Genset Delay period 30 seconds. After the 30 seconds expires, the load is
still above the Max Gen Load set point. The master control issues a start
command to the next unit on (network priority #2).
Next Genset Delay
—Only on the Master controls Sequence Status screen, to
the right of this item, you can see the delay time being counted down from 30. It
will keep repeating this countdown and continue starting units until the system
load level goes below the Max Gen Load set point.
Point C
Ten seconds after receiving its start command, network priority #2 unit closes
onto the bus and ramps into load sharing with the master.
Point D
System load levels drop to approximately 45% after unit #2 is finished ramping
into load sharing.
Point E
A very large step load on the bus loads both generators in excess of 100% of
their rated load. The system load reflects these levels. The master unit begins
timing to the Rated Load Delay (5 seconds) before starting the third unit.