Reactive Power Setpoint Via Displacement Power Factor Cos Φ: Pfcnst Mode; Displacement Power Factor Cos Φ Via Standard Signal: Pfcnstanin Mode - SMA SUNNY CENTRAL 500CP XT User Manual

10 Function Description
Signal Power limit
11.5 mA 0 kVAr
> 19 mA
Qmax / overexcited
The analog value is converted to a setpoint for power limitation. Here, the parameter Qmax forms the end point of the
linear characteristic curve.
Figure 25: Limitation of the reactive power to the parameter Qmax
10.3.3.7 Reactive Power Setpoint via Displacement Power Factor cos φ: PFCnst Mode
The reactive power setpoint is set via 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.
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
< 2 mA Last valid mean value or 0 kVAr after
restart
2 mA to 4 mA PFAbsMin/underexcited
96 SCCPXT-E7-BA-en-58
Description
Zero-crossing of the characteristic curve
No reactive power is fed in.
End point of the characteristic curve
The maximum amount of positively excited reactive
power is fed in.
Description
Signal is in the invalid range.
The maximum amount of negatively excited reactive
power is fed in.
SMA Solar Technology AG
User Manual