Two sets of load-dependent start parameters
You can use both sets of load-dependent start parameters:
•
Configure one parameter set for low available power, with a long timer setting.
◦
The timer period helps to ensure that the genset start really is needed.
•
Configure the other parameter set with a low timer setting for very low available power.
◦
This ensures that the PMS responds quickly to a very low available power.
Two sets of start parameters example
The graph shows available power and time, with two sets of
start parameters. In this example, Limit 1 is exceeded for
Timer 1, and so the PMS starts a genset.
Limit 1
Available
power
time
Limit 2
t1
t2
7.4.3 Load-dependent start flowchart
PMS control,
GENSET in
AUTO
Available
power < Load-
dependent
start limit
No
Yes
Start next
genset in
priority queue
Load-dependent
start timer starts
Timer has
run out
No
Yes
Available
power < Load-
dependent
start limit
Yes
No
System may
become
overloaded
Genset
available to
start
No
Yes
1. The sequence starts if the PMS available power falls below the start limit.
2. A genset must be able to start for the sequence to continue. Otherwise, the
system may become overloaded.
3. The load-dependent start timer starts.
4. If the PMS available power is below the load-dependent start limit until the
timer runs out, the power management system starts the next available genset
in the priority order.
DESIGNER'S HANDBOOK 4189340911K UK
Page 230 of 521
