SMA SC 500HE-US - Manual (Page 37)

SMA America, LLC 7 Active Power Limitation
Operating Manual SC500HEUS-eng-BE-BUS120320 37
1. Ensure that the inverter is in the operating state "Stop".
2. Launch the Sunny WebBox user interface.
3. Enter the installer password in the appropriate field on the homepage and confirm with [Login].
4. Change the parameter "P-WMod" in the Sunny WebBox user interface
(see section 6.2 "Changing Parameters", page 34).
5. Change the parameters belonging to the selected procedure.
6. Confirm the parameter entry with [Save].
7.2.2 "Off" Procedure
The feed-in capacity is limited by the parameter "Pmax".
The parameter "Pmax" defines the nominal power of the inverter and is set to the local conditions
during commissioning. Before the parameter "Pmax" can be changed, the device must be in the
operating state "Stop" and the installer password must be entered.
7.2.3 "WCtlCom" Procedure
The target value for active power limitation is received by the Sunny WebBox via the
Power Reducer Box and then forwarded to the Sunny Central. If the Sunny Central has received no
signal for 5 minutes, the error message "P-WModFailStt" will be displayed (see section
7.4 "Displaying Error Messages and Warnings for Active Power Limitation", page 39).
7.2.4 "WCnst" Procedure
The active power limitation is entered as an absolute value via the parameter "P-W".
The parameter "P-W" defines the active power to be fed in. The parameter "P-W" can be changed
during feed-in operation. The value of the parameter "P-W" may be as large as the value of the
parameter "Pmax" at maximum.
Parameter blocking
The parameter "P-WMod" may only be changed when the device is in the operating state
"Stop". The entry will not be accepted in other operating states.
Parameter used Pmax
Parameters used None
Parameter used P-W