8 Power Control
SMA Solar Technology AG
52
SCCP-JP-BA-A4-en-12
User Manual
8.1.2.6 Active Power Limitation via Standard Signal: WCnstNomAnIn Mode
The active power limitation is set at the input terminals for setpoint specification using an analog signal (see Sunny Central
installation manual). This is usually implemented by a ripple control signal.
The electrical current strength of the connected signal determines the nominal active power.
The analog measured values must be between 4 mA and 19 mA. If the analog signal is less than 2 mA, an error message
will be displayed in the instantaneous value
P-WModFailStt
The analog value is converted to a setpoint for power limitation. Here, the parameter
Pmax
forms the end point of the
linear characteristic curve.
8.1.3 Displaying the Status of Active Power Limitation
The instantaneous value
P
-
WModStt
indicates the status of active power limitation.
Procedure:
• Display the instantaneous value
P-WModStt
on the user interface (see Section 6.1, page 40).
8.1.4 Displaying Error Messages and Warnings for Active Power Limitation
The instantaneous value
P
-
WModFailStt
displays errors or warnings associated with active power limitation.
Procedure:
• Display the instantaneous value
P-WModFailStt
on the user interface (see Section 6.1, page 40).
Signal
Power limit
Description
< 2 mA
Last valid value or
Pmax
after restart
Signal is in the invalid range.
2 mA to 4 mA
0 kW
No power is fed into the grid.
4 mA to 19 mA
0 kW to Pmax
The energy fed into the grid is determined by a characteristic curve.
> 19 mA
Pmax
The power fed into the grid equals
Pmax
.
Display
Description
Off
No mode for active power limitation has been selected.
WMax
Active power is limited by specification of an upper limit. This limit is relative to Pmax.
Hz
Active power is limited by a frequency increase.
Tmp
Active power is limited by temperature derating.
AmpPv
Active power is limited via a DC current limitation.
AmpAC
Active power is limited via an AC current limitation.
Display
Cause and corrective measure
Off
No mode for active power limitation has been selected.
OK
A mode for active power limitation has been selected and there are no errors present.
