SMA SC 400HE - Manual (Page 44)

4 Sunny Central Control SMA Solar Technology AG
44 SC4-63HE-BE-BEN103280 Operating Manual
4.7.3 "WCtlCom" Procedure
The target value for the active power limitation is received by the Sunny Central Control via the Power
Reducer Box and then forwarded to the Sunny Central. If the Sunny Central has received no signal
for 5 minutes, the "P-WModFailStt" error message will be displayed.
4.7.4 "WCnst" Procedure
The active power limitation is entered as an absolute value using the "P-W" parameter.
The "P-W" parameter defines the active power to be fed in. The "P-W" parameter can be changed
during feed-in operation. The "P-W" parameter must always be smaller than the "Pmax" parameter.
4.7.5 "WCnstNom" Procedure
Active power limitation is set as a percentage value using the "P-WNom" parameter. The percentage
value refers to the "Pmax" parameter.
The "P-WNom" parameter indicates the percentage of maximum possible power to be fed in. The
"P-WNom" parameter can be changed during feed-in operation.
4.7.6 "WCnstNomAnln" Procedure
Active power limitation is set at the input terminals using an analog signal for specifying the target
value (see the enclosed inverter installation manual). This is usually accomplished by using a radio
ripple control receiver.
The current of the connected signal determines the rated active power.
The analog measured values must be between 4 mA … 19 mA. If the analog signal is smaller than
2 mA, the error message "P-WModFailStt" will be displayed.
Used parameters none
Used parameters P-W
Used parameters P-WNom
Signal Power limit Description
< 2 mA Last valid value and/or "Pmax"
after restart Signal is in the invalid range
2 mA … 4 mA 0 No power is fed into the grid.
4 mA … 19 mA 0 … Pmax Fed-in energy is determined
using a characteristic curve
> 19 mA Pmax Fed-in energy is Pmax