SMA SC 400HE - Manual (Page 50)

4 Sunny Central Control SMA Solar Technology AG
50 SC4-63HE-BE-BEN103280 Operating Manual
4.8.5 "VArCnst" Procedure
The reactive power target value is set using the "Q-VAr" parameter. The "Q-VAr" parameter must be
smaller or equal to "Qmax".
4.8.6 "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 total reactive power exceeds the predefined "Qmax"
value, "Qmax" will be provided by the device.
4.8.7 "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 "Q-VarModFailStt" is displayed.
The analog value is converted to a target value for power limitation. Here, the "Pmax" parameter is
the end point of the linear characteristic curve.
Used parameters Q-VAr
Used parameters Q-VArNom
Signal Power limit Description
< 2 mA Last valid value, or 0 after
reboot
Signal is in the invalid range
2 mA … 4 mA − Pmax The maximum amount of
negatively excited reactive
power is fed in.
4 mA − Pmax Starting point of the curve
Maximum amount of negatively
excited reactive power is fed in.
11.5 mA 0 Zero-crossing of the curve No
reactive power is fed in.
> 19 mA +Pmax End point of the curve
Maximum amount of positively
excited reactive power is fed in.