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1)
There is 60kW redundancy on busbar which is composed by two parallel running generators, then the
heavy consumer request 1 is active (request power is 70kW).
2)
An additional 100kW generator should be started if system calculates the power needed not meet the
load starting.
3)
There is 160kW redundancy on busbar after genset started and in parallel, then the acknowledged
signal will be initiated.
If a heavy consumer is requested, the system calculates the power needed according to the requested
value of heavy consumer power. If the request is not satisfied, the controller will start the corresponding
standby units, if satisfied and the heavy consumer stability delays, then the acknowledged signal will be
initiated, heavy consumer answer output delay ends, if the heavy consumer feedback inactive system is
only heavy consumer includes its rated power, and the controller does not reserve any power after the
heavy consumer feedback is effective.
Example：
1)
There is 60kW redundancy on busbar which is composed by two parallel running generators, then the
heavy consumer request 1 is active (request power is 70kW).
2)
An additional 100kW generator should be started if system calculates the power needed.
3)
There is 160kW redundancy on busbar after genset started and in parallel, then the acknowledged
signal will be initiated.
10.4.3
HEAVY CONSUMER PERMISSION
If a heavy consumer is requested, the system calculates the power needed according to the requested
value of heavy consumer power. If the request is not satisfied, the controller will start the corresponding
standby units, if satisfied and the heavy consumer stability delays, then the acknowledged signal will be
initiated and the signal is variable. If the current bus power is not enough, the heavy consumer permission
signal will not output
10.4.4
HEAVY CONSUMER FEEDBACK
The feedback can be divided into switching signal and analog signal according to the type of heavy
consumer (fixed power and variable power). Heavy consumer feedback signal is sent to the controller after
the requested heavy consumer starts normally. If it is a fixed power one, the system will not reserve any
power for the heavy consumer after the controller receives the switching feedback signal. If it is a variable
power one, the controller receives an analog feedback signal >=2% of the rated power of heavy consumer,
it is considered that the heavy load has been started, and the system reserves the remaining power of the
rated power of heavy consumer (rated power of heavy consumer - current power of heavy consumer).
As the example below illustrates：
1)
After the answer is active, the real power of the load is 30kW.
2)
There is 130kW redundancy on busbar, if stop condition is satisfied, the additional generator will be
stopped.
HMC6 Power Management Controller User Manual
Page 37 of 87
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