SMA SUNNY CENTRAL 800CP XT - Reactive Power Setpoint Via Displacement Power Factor Cos Φ: Pfcnst Mode; Displacement Power Factor Cos Φ Via Standard Signal: Pfcnstanin Mode

10 Function Description
SMA Solar Technology AG
User ManualSCCPXT-E7-BA-en-5896
Signal Power limit Description
11.5mA 0 kVAr Zero-crossing of the characteristic curve
No reactive power is fed in.
>19mA
Qmax / overexcited
End point of the characteristic curve
The maximum amount of positively excited reactive
power is fed in.
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 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.