SMA SC 500HE-20 - Manual (Page 49)

SMA Solar Technology AG 6 Setpoint for Active Power and Reactive Power
Operating Manual SCxxxHE-20-BE-BEN111210 49
The analog value is converted to a target value for power limitation. Here, the "Pmax" parameter is
the end point of the linear characteristic curve.
Figure 15: Limiting the parameter "Pmax" to the parameter "Qmax"
If the value of "P
max
" exceeds the value of "Qmax", the characteristic curve for the value "Qmax" is
limited to "Qmax" and has a linear progression from -Pmax to − Q
max
and from +Q
max
to +P
max
.
Signal Power limit Description
< 2 mA last valid value or 0 kVAr after
restart
Signal is in the invalid range.
2 mA … 4 mA − Pmax The maximum amount of negatively excited
reactive power is fed in.
4 mA − Pmax Start point of curve
Maximum amount of negatively excited
reactive power is fed in.
11.5 mA 0 kVAr Zero-crossing of the curve
No reactive power is fed in.
> 19 mA +Pmax End point of the curve
Maximum amount of positively excited
reactive power is fed in.
Used parameters None