7.7.3 Heavy consumer sequence
Fixed heavy consumer sequence
Figure 7.7
Sequence diagram for the fixed heavy consumer function with a pulse request signal
t1
Request
Extra power
available
Acknowledge
(1)
(2)
(3)
Feedback
(4)
t2
t1 = Time required to start extra genset(s) for the heavy consumer
t2 = Pulse width (
Configure > Parameters > Heavy consumers > [Heavy consumer #] > Acknowledge
, where # is 1 to 4 and
[Heavy consumer #] can be replaced by the heavy consumer
Controller label
)
1.
Request
:
Heavy consumers > [Heavy consumer #] > Request
(digital input). An operator or an external signal activates this
input.
2.
Extra power available
: The PMS starts genset(s), until enough extra power is available for the heavy consumer.
3.
Acknowledge
:
Heavy consumers > [Heavy consumer #] > Acknowledge
(digital output). When enough extra power is available,
the controller activates this output.
4.
Feedback
:
Heavy consumers > [Heavy consumer #] > Feedback
(digital input). The heavy consumer detects the
Acknowledge
,
then connects, takes load, and activates this input.
Fixed heavy consumer sequence with acknowledge delay
Figure 7.8
Sequence diagram for the fixed heavy consumer function with a pulse request signal and an acknowledge delay
t1
Request
Extra power
available
Acknowledge
(1)
(2)
(3)
Feedback
(4)
t3
t2
t1 = Time required to start extra genset(s) for the heavy consumer
t2 = Acknowledge delay
DESIGNER'S HANDBOOK 4189340911K UK
Page 264 of 521
