SMA POWER PLANT CONTROLLER - Manual (Page 31)

SMA Solar Technology AG 7 Operation
Operating Manual PPC-BE-P7-en-13 31
– Make the desired settings in the remaining columns:
7.6.4 Adjusting the Configuration of the Network Analyzers
At the point of interconnection, the current values for active power, reactive power, voltage and frequency are measured.
The measured values are captured in up to three network analyzers. For each variable, a network analyzer can be
selected as the source for the default value. A second network analyzer independent of the first network analyzer can be
selected as the source for the redundant second measured value. If one of the default values fails, the redundant second
measured value will be used in its place.
The measured values are either queried by the Power Plant Controller via Modbus using a network analyzer or submitted
to the Power Plant Controller as analog input signals.
In order to ensure the correct processing of the measured values, the network analyzer used must be configured.
After commissioning the Power Plant Controller, you can still change the IP address of the network analyzer, adjust its
device type and assign it a unique name.
If a network analyzer is to be serviced or replaced, measurements by this network analyzer should be deactivated in
advance.
Column Setting
MB Time Server Activation (TRUE) / deactivation (FALSE) of the specification of time through an external
Modbus time server
Q at Night Activation (TRUE) / deactivation (FALSE) of the "Q at Night: function in the inverters if this
function is available
Qac Nom Input of the nominal reactive power as a total of all inverters connected to the Cluster
Controller
first Q limit The first threshold of the reactive power for all inverters connected to the Cluster Controller.
If this lower reactive power limit is reached during operation, the inverters no longer receive
higher output values initially. The effectiveness of this threshold is however canceled if the
inverters would be able mathematically to supply reactive powers above the second
threshold.
second Q limit The second threshold of the reactive power for all inverters connected to the
Cluster Controller.
If the first Q limit and the second Q limit were selected identically (default setting),
this function is deactivated.