SMA SC 500HE-20 - Manual (Page 41)

SMA Solar Technology AG 6 Setpoint for Active Power and Reactive Power
Operating Manual SCxxxHE-20-BE-BEN111210 41
6 Setpoint for Active Power and Reactive Power
6.1 Active Power Limitation
6.1.1 Frequency-Independent Active Power Limitation Procedure
The Sunny Central can limit its active power if requested by the distribution grid operator. You can use
the "P-WMod" parameter to set the procedure for limiting active power (see section 5.2 "Changing
Parameters", page 34). You use the parameter to configure how the utility operator's parameters
should be received and implemented. The default value for this parameter is "Off".
There are 5 different procedures for grid frequency independent limitation of active power:
6.1.2 Setting the Active Power Limitation Procedure and
Associated Parameters
1. Make sure the inverter is in the "Stop" operating state.
2. Access the SC-COM interface.
3. Enter your password in the appropriate field on the homepage and press [Login].
4. Change the "P-WMod" parameter on the SC-COM interface. Make a selection from the list of
available procedures (see section 5.2 "Changing Parameters", page 34).
5. Change parameters belonging to the selected procedure.
6. Confirm parameter by pressing [Save].
Contact the SMA Service Line before changing any parameters
The parameter "P-WMod" may only be changed when the device is in the "Stop" operating
state. The entry will not be accepted in other operating states.
Procedure Description
Off Active power is limited to the device's rated output power "Pmax".
WCtlCom The active power limitation is received by the SC-COM via the
Power Reducer Box and then forwarded to the Sunny Central.
WCnst The active power limitation is entered as an absolute value using
the "P-W" parameter.
WCnstNom The active power limitation is entered as a percentage value using
the "P-WNom" parameter.
WCnstNomAnIn Active power limitation is set at the input terminals using an analog
signal for specifying the target value.