Deif PPM 300, Designers Handbook

Page: 265 / 521

t3 = 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 waits for the time specified by the acknowledge delay parameter before the controller activates the Acknowledge
digital output.
4. Feedback : Heavy consumers > [Heavy consumer #] > Feedback (digital input). The heavy consumer detects the Acknowledge ,
then connects, takes load, and activates this input.
Variable heavy consumer sequence
Figure 7.9 Sequence diagram for the variable heavy consumer function with a continuous 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.
•
If the Request digital input is deactivated after the Feedback is above 2 %, then the heavy consumer power is reserved until
the Feedback falls below 1 %.
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). The controller activates this output.
4. Feedback : Heavy consumers > [Heavy consumer #] > Feedback ( analogue input). The heavy consumer detects the
Acknowledge , then connects, and takes load. This input must show how much load is taken.
DESIGNER'S HANDBOOK 4189340911K UK Page 265 of 521