SMA SC 500HE-20 - Manual (Page 43)

SMA Solar Technology AG 6 Setpoint for Active Power and Reactive Power
Operating Manual SCxxxHE-20-BE-BEN111210 43
6.1.7 "WCnstNomAnln" Procedure
Active power limitation is set at the input terminals using an analog signal for specifying the setpoint
(see enclosed 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 will be displayed in the "P-WModFailStt" spot value.
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.
6.1.8 Displaying Error Messages and Warnings for Active Power
Limitation
The "P-WModFailStt" spot value displays the error messages or warnings associated with active
power limitation.
Displaying the "P-WModFailStt" Channel
• Display the "P-WModFailStt" spot value on the SC-COM interface (see section 5.1 "Displaying
Spot Values", page 34).
Signal Power limit Description
< 2 mA Last valid value or "Pmax" after
restart Signal is in the invalid range.
2 mA … 4 mA 0 kW No power is fed into the grid.
4 mA … 19 mA 0 kW … Pmax Fed-in energy is determined
using a characteristic curve
> 19 mA Pmax Fed-in energy equals Pmax.
Used parameters None
Display Description Measure
Off No procedure for limiting active power
has been chosen. None
Ok A procedure for limiting active power
has been chosen and there are no
errors. None