Deif PPM 300 - Heavy Consumer Flowcharts and Example

7.7.4 Heavy consumer flowcharts and example
Heavy consumer request flowchart
Heavy
consumer
request on
Enough
power
No
Yes
Start genset
Start reservation
timer
Timer
expired
No
Yes
Alarm
HC
request
(continuous)
on
No
Yes
Activate heavy
consumer
acknowledge
Sequence ends
1. When a heavy consumer needs to start, a request is sent to the controller
by activating the Heavy consumers > [Heavy consumer #] > Request
digital input.
2. The PMS starts the Heavy consumer reservation not possible timer.
3. The PMS uses the heavy consumer Initial load to calculate whether there
is enough power for the heavy consumer to connect.
4. The PMS starts additional genset(s) if needed (that is, if the PMS available
power after the heavy consumer connects is less than the load-dependent
start limit).
• If power reservation is impossible, or if the Heavy consumer
reservation not possible timer runs out, then the controller activates the
Heavy consumer reservation not possible alarm.
INFO
If you use a pulse request signal, then the heavy consumer request
sequence can only stop when there wasn't enough power for the
heavy consumer to connect and the Heavy consumer reservation
not possible timer runs out. If you use a continuous signal, then the
heavy consumer request sequence can be stopped at any time.
DESIGNER'S HANDBOOK 4189340911K UK Page 266 of 521