SMA SC 500CP XT - Manual (Page 98)

10.3.3.8 Displacement Power Factor cos φ via Standard Signal: PFCnstAnIn Mode
The reactive power setpoint is set at the input terminals for the setpoints via an analog signal. This is usually
implemented by a ripple control signal. 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, an error message will be displayed in the
instantaneous value Q‑VArModFailStt.
Signal Power limit Description
< 2 mA Last valid mean value or 0 kVAr 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 Start point of the characteristic curve
The maximum amount of negatively excited reactive
power is fed in.
11.5 mA 0 kVAr Zero-crossing of the characteristic curve
No reactive power is fed in.
> 19 mA PFAbsMin / overexcited End point of the characteristic curve
The maximum amount of positively excited reactive
power is fed in.
The analog value is converted into a setpoint for the displacement power factor cos φ. Here, the parameter PFAbsMin
is the starting and end point of the linear characteristic curve.
10 Function Description SMA Solar Technology AG
User Manual SCCPXT-BA-E4-en-54 98