SMA POWER PLANT CONTROLLER - Manual (Page 34)

7 Operation SMA Solar Technology AG
34 PPC-BE-P7-en-13 Operating Manual
Procedure:
1. Log into the user interface as an installer (see Section 11.3.1, page 54).
2. Go to PPC > Settings > Modbus server.
3. To adjust the profile of the Modbus server, select the desired entry in the drop-down list Modbus server profile.
4. To enable or to disable the Modbus server, select the option Yes or No in the drop-down list Active.
5. In the drop-down list Release IP address range, select the desired option.
6. To enable automatic monitoring of the connection to the Modbus Client, perform the following steps:
• In the drop-down list Setpoint supervision, select the entry Yes.
• In the field Monitoring time setpoint supervision, enter the desired time.
☑ Once the waiting time has expired, the connection is interrupted by the Modbus server.
7. In the drop-down list Enable change counter, select Yes if required. If it is set to No, each change in the Modbus
protocol will be accepted as a setpoint change.
8. To enable scaling of the input signals on the page PPC > Grid system services > Input signals > Measurement
values, select Yes in the drop-down list Customized scaling.
7.8 Transmitting Output Values to Devices of the PV System
If anything in the system is changed after commissioning of the Power Plant Controller, it may be necessary to adjust the
transmission of the output values for the setpoint. It is possible to disable the transmission of output values or adjust the
mode of transmission of output values.
Procedure:
1. Log into the user interface (see Section 11.3.1, page 54).
2. To adjust the transmission of control values to the Sunny Central devices, select PPC > Settings > System
communication > Inverter.
3. Make the necessary changes in the appropriate fields as follows:
– enable or disable the transmission of output values in the drop-down list Active
– Enter the waiting time between two output value transmissions in the field Idle time [ms]. The recommended time
is 5 ms.
4. To adjust the transmission of control values to the Cluster Controllers, select PPC > Settings > System
communication > Cluster Controller.
5. Make the necessary changes in the appropriate fields as follows:
– Enable or disable the transmission of output values in the drop-down list Active
– Enter the waiting time between two output value transmissions in the field Idle time [ms]. The recommended time
is 1,000 ms.
7.9 Selecting the Signal Source and Adjusting the Scaling of Measured
Values
The measured values of the PV system that are used to calculate the output values can be transmitted via various channels
to the Power Plant Controller. If the signal transmission changes after commissioning the Power Plant Controller, it can be
adjusted. The settings for the individual measured values of active power, reactive power, voltage, and frequency can
be made separately.
If an error occurs during transmission of the measured values via Modbus protocol, the last calculated output values can
be used (see Section 13.4 "Output Value Specification Under Fault Conditions", page 59), or you can use substitution
values (see Section 7.10 "Local Specification of Setpoints", page 37).