SMA SC 500HE-20 - Manual (Page 48)

6 Setpoint for Active Power and Reactive Power SMA Solar Technology AG
48 SCxxxHE-20-BE-BEN111210 Operating Manual
6.2.3 "VArCtlCom" Procedure
The reactive power target value is received by the SC-COM through the Power Reducer Box and
forwarded to the Sunny Central. The target value is detected as a percentage and converted to kVAr
inside the device.
If the Sunny Central has received no signal for 5 minutes, the error message in the "Q-VArModFailStt"
spot value will be displayed.
6.2.4 "PFCtlCom" Procedure
The reactive power target value is received by the SC-COM through the Power Reducer Box and
forwarded to the Sunny Central. A power factor is transmitted as a predefined target value.
If the Sunny Central has received no signal for 5 minutes, the error message in the "Q-VArModFailStt"
spot value will be displayed.
6.2.5 "VArCnst" Procedure
The reactive power target value is set using the "Q-VAr" parameter. Note that the "Q-VAr" parameter
may be within the "‒Qmax” … „+Qmax" range.
6.2.6 "VArCnstNom" Procedure
The "Q-VArNom" parameter is used to set the reactive power target value (in %). The "Q-VArNom"
parameter refers to "Pmax". If the calculated amount of reactive power exceeds the predefined value
"Qmax", the power will be limited to "Qmax". If the calculated amount of reactive power falls below
the predefined value "‒Qmax", the power will be limited to "‒Qmax".
6.2.7 "VArCnstNomAnIn" Procedure
The reactive power target value is set at the input terminals using an analog signal for specifying the
target value (see enclosed installation manual). This is usually accomplished by using a radio ripple
control receiver.
The analog value is converted into a reactive power target value. The current of the connected signal
determines the target value.
The analog measured values must be between 4 mA … 19 mA. If the analog signal is smaller than
2 mA, the error message in the "Q-VarModFailStt" spot value will be displayed.
Used parameters None
Used parameters None
Used parameters Q-VAr
Used parameters Q-VArNom