SMA SC 500HE-US - Manual (Page 39)

SMA America, LLC 7 Active Power Limitation
Operating Manual SC500HEUS-eng-BE-BUS120320 39
7.4 Displaying Error Messages and Warnings for Active Power
Limitation
The instantaneous value "P-WModFailStt" displays the error messages or warnings associated with
active power limitation.
• Display the instantaneous value " P-WModFailStt" on the Sunny WebBox user interface (see
section 6.1 "Displaying the Instantaneous Values", page 34).
Display Explanation
"Off" No procedure for active power limitation has been selected..
"WMax" Active power is limited by the specified maximum limit. Here, the limit is based on
the value of the parameter "Pmax".
"Hz" Active power is limited by a frequency increase.
"Tmp" Active power is limited due to temperature derating.
"AmpPv" Active power is limited via PV power limitation.
Display Cause and corrective measures
"Off" No procedure for active power limitation has been selected.
"Ok" A procedure for active power limitation has been selected and there are no errors.
"ComFail" The procedure "WCtlCom" has been selected and the expected signal with a valid
active power limitation has been absent for 5 minutes.
Corrective measures:
• Ensure that the Sunny WebBox and the Power Reducer Box can be accessed
via the Internet.
• Ensure that the Sunny WebBox and the Power Reducer Box are connected
correctly.
• Ensure that the cabling between the Sunny WebBox and the inverter is OK.
"AnInFail" The procedure "WCnstNomAnIn" has been selected and the value measured at the
analog input is less than 2 mA.
Corrective measures:
• Ensure that the signal cable is correctly connected to the analog input.