SMA SC 500CP-US-10 600V - Manual (Page 54)

7 Active Power Limitation SMA America, LLC
54 SCCP-US-BE-US_en-52 Operating Manual
6. Confirm the parameter entry with [Save].
7.2.2 Off Procedure
The feed-in power is limited to the parameter Pmax.
The parameter Pmax defines the nominal power of the inverter and is set to the local conditions during commissioning.
Before the parameter Pmax can be changed, the device must be in the operating state "Stop" and the installer password
must be entered.
7.2.3 WCtlCom Procedure
The setpoint for the active power limitation is received by the SC-COM via Modbus and then transmitted to the inverter.
If the inverter has received no signal for five minutes, the error message will be displayed in the P-WModFailStt
instantaneous value.
7.2.4 WCnst Procedure
The active power limitation is entered as an absolute value via the parameter P-W.
The parameter P-W defines the active power to be fed in. The parameter P-W can be changed during feed-in operation.
The parameter P-W must not be greater than the parameter Pmax.
7.2.5 WCnstNom Procedure
The active power limitation is set as a percentage value via the parameter P-WNom. The percentage value refers to the
parameter Pmax.
The parameter P-WNom indicates the percentage of maximum possible power to be fed in. The parameter P-WNom
can be changed during feed-in operation.
7.2.6 WCnstNomAnln Procedure
The active power limitation is set at the input terminals using an analog signal for specifying the setpoint
(see Sunny Central installation manual). This is usually accomplished via a ripple control receiver.
The electrical current strength of the connected signal determines the nominal active power.
The analog measured values must be between 4 mA and 19 mA. If the analog signal is less than 2 mA, the error
message will be displayed in the P-WModFailStt instantaneous value.
The analog value is converted to a setpoint for power limitation. Here, the parameter Pmax is the end point of the linear
characteristic curve.
Parameters used Pmax
Parameters used none
Parameter used P-W
Parameter used P-WNom
Signal Power limit Description
< 2 mA Last valid value or Pmax
after restart
Signal is in the invalid range. The display shows error message 8701.
2 mA to 4 mA 0 kW No power is fed into the grid.
4 mA to 19 mA 0 kW to Pmax The power fed into the grid is determined using a characteristic curve
> 19 mA Pmax The power fed into the grid equals Pmax.
Parameters used none