SMA SC 500CP-US-10 600V - Manual (Page 59)

SMA America, LLC 8 Reactive Power Control
Operating Manual SCCP-US-BE-US_en-52 59
8.1.7 PFCnst Procedure
The reactive power setpoint is set using the parameters PF-PF and PF-PFExt. The parameter PF-PF indicates the
displacement power factor cos φ and the parameter PF-PFExt indicates the degree of overexcitation or underexcitation.
8.1.8 PFCnstAnln Procedure
The reactive power setpoint is set at the input terminals via an analog signal for specifying the setpoint (see Sunny Central
installation manual). This is usually accomplished via a ripple control receiver.
The analog value is converted into a displacement power factor cos φ. The electrical current strength of the connected
signal determines the setpoint.
The analog measured values must be between 4 mA and 19 mA. If the analog signal is less than 2 mA, the error
message will be displayed in the Q-VArModFailStt instantaneous value.
The analog value is converted into a target value for the displacement power factor cos φ. Here, the parameter
PFAbsMin is the start and end point of the linear characteristic curve.
Parameters used PF-PF
PF-PFExt
Signal Power limit Description
< 2 mA Last valid value or 1 after
restart
Signal is in the invalid range.
2 mA to 4 mA PFAbsMin /
underexcited
The maximum amount of negatively excited reactive power is fed in.
4 mA PFAbsMin /
underexcited
Starting point of the characteristic curve
Maximum amount of negatively excited reactive power is fed in.
11.5 mA 1 Zero-crossing of the characteristic curve
No reactive power is fed in.
> 19 mA PFAbsMin/overexcited End point of the characteristic curve
Maximum amount of positively excited reactive power is fed in.
Parameter used PFAbsMin