SMA SC 500CP-US-10 600V - Manual (Page 66)

8 Reactive Power Control SMA America, LLC
66 SCCP-US-BE-US_en-52 Operating Manual
7. If SubVal has been selected, enter the proxy values for normal feed-in operation and for operation outside of normal
feed-in operation, as follows:
8. In the parameter PwrMonErrTm configure the time lapse until recognition of the absence of setpoint values.
9. Confirm the parameter entry with [Save].
8.3.1.1 No Q at Night: Off Procedure
The reactive power setpoint is limited to 0 kVAr. This setpoint cannot be controlled.
8.3.1.2 Q at Night with Operation Command via Modbus Protocol: WCtlCom Procedure
The SC-COM receives the reactive power setpoint via Modbus and transmits it to the inverter. The setpoint is transmitted
as a percentage and converted to kVAr in the device.
If the inverter has not received any signal for the last five minutes, the error message will be displayed in the instantaneous
value Q-VArModFailStt.
8.3.1.3 Q at Night with Absolute Value: VArCnst Procedure
The reactive power setpoint is set using the parameter QoDQ-VAr. Note that the parameter QoDQ-VAr may be within
the range ‒QoDQmax to +QoDQmax.
8.3.1.4 Q at Night as a Percentage of the Nominal Power: VArCnstNom Procedure
The parameter QoDQ-VArNom is used to set the reactive power setpoint in %. The parameter QoDQ-VArNom refers
to Pmax. If the calculated amount of reactive power exceeds the predefined value of QoDQmax, the power will be
limited to QoDQmax. If the calculated amount of reactive power falls below the predefined value of ‒QoDQmax, the
power will be limited to ‒QoDQmax.
8.3.1.5 Q at Night via Standard Signal: VArCnstNomAnIn Procedure
The reactive power setpoint is set via an analog signal at the input terminals for setpoint specification (see Sunny Central
installation manual). This is usually implemented by a ripple control receiver.
The analog value is converted into a reactive power setpoint. The electrical current strength of the connected signal
determines the setpoint.
SubVal Utilization of the configured proxy values. SMA recommends use of the proxy values when
setpoint specifications are effected via analog signals.
Parameters Description
Q-VArSubValRun Proxy value for the reactive power setpoint in feed-in operation
PF-PFSubValRun Proxy value for the displacement power factor in feed-in operation
PF-PFExtSubValR Proxy value for the excitation of the displacement power factor in feed-in operation
Q-VArSubVal Proxy value for the reactive power setpoint outside of feed-in operation
PF-PFSubVal Proxy value for the displacement power factor outside of feed-in operation
PF-PFExtSubVal Proxy value for the excitation of the displacement power factor outside of feed-in operation
Parameters used none
Parameters used none
Parameters used QoDQ-VAr
Parameters used QoDQ-VArNom
Setting Description