Heavy consumer acknowledge and feedback flowchart
HC
feedback
No
Yes
Feedback
timeout
expired
No
Yes
Alarm
HC
request
(continuous)
on
No
Yes
Timer
expired
No
Yes
Deactivate
heavy consumer
acknowledge
HC
request
(continuous)
on
No
Yes
Activate heavy
consumer
acknowledge
HC started
Sequence ends
Sequence ends
1. When enough power is available, the controller activates the Heavy
consumers > [Heavy consumer #] > Acknowledge output for the Pulse
width. The Feedback timeout > Delay timer starts running.
2. Feedback:
• For a fixed load heavy consumer, when the heavy consumer connects,
it must activate the Heavy consumers > [Heavy consumer #] >
Feedback. As long as this feedback is not activated, the PMS reserves
the heavy consumer's full nominal power at the busbar. When this
feedback is activated, the heavy consumer draws power as part of the
system load, and the PMS does not reserve any extra power.
• For a variable load heavy consumer, the power reserved for the heavy
consumer changes according to the heavy consumer load feedback.
For example, when the load feedback is 80 % of the nominal load, the
power reserved at the busbar is 20 % of the nominal load.
• If feedback is not received before the feedback timeout expires, the
PMS activates the Heavy consumer feedback timeout alarm.
INFO
If the heavy consumer request signal is a pulse, then the state of the
signal is not checked in this procedure.
Connected heavy consumer and disconnect flowchart
Adjust required
power
HC
request
(continuous)
off
No
Yes
Heavy
consumer
standby
Feedback
value < 1%
No
Yes
HC started
1. When the heavy consumer is connected, the controller adjust the power
requirements for the system.
2. When the heavy consumer is no longer required, the operator (or an external signal)
must:
• Pulse request signal: Reduce the heavy consumer power consumption.
• Continuous request signal: Turn off the Heavy consumers > [Heavy consumer
#] > Request digital input.
3. The sequence ends when:
• Variable load heavy consumer: The Request is not activated and the feedback
falls below 1 %.
• Fixed load heavy consumer: The Request is not activated and there is no
longer any feedback from the heavy consumer.
DESIGNER'S HANDBOOK 4189340911K UK Page 267 of 521
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