48 Program features
Status information
Typically, the inverter operates autonomously by starting and stopping until internal
operating conditions are satisfied. The inverter can be remotely controlled to connect or
disconnect from the grid. When a request for re-connection to the grid is sent, several
internal conditions are checked before connection can take place. The operating states
and operational status of the inverter can be seen through the variables in parameter
group 173 Inverter status.
State machines
The inverter software has several state machines that control its operation. The most
relevant state machines can be seen through parameters 173.02 Inverter main state and
173.03 MPPT unit state.
• The first state parameter describes higher level operation such as, if the inverter is
connecting to or disconnecting from the grid.
• The second state parameter describes the status of the MPPT unit. It indicates, for
instance, if the power module is charged, running, or stopped.
Status words
The inverter indicates its main state in parameter 173.01 Main status word by collecting
the high level inverter information into this location. See the status word bit definitions in
the parameter list on page 102.
The inverter can be controlled to stop externally. The states from these commands are
collected into parameter 173.04 Start command SW. For instance, if the inverter is
requested to stop remotely by SCADA. If all defined bits are set in parameter 173.04, then
the inverter may start if internal operating conditions are fulfilled.
The inverter has several internal check conditions that may prevent it from starting. The
state of these conditions can be seen from parameters 173.05 Internal inverter inhibitors 1
and 173.07 Internal inverter inhibitors 3. If a bit is set in these parameters then the inverter
will not start until the condition has stopped.
Parameter 173.05 Internal inverter inhibitors 1 – indicates inverter level information such
as if the grid or configuration status is sufficient for the inverter to start and run.
Parameter 173.07 Internal inverter inhibitors 3 – indicates MPPT unit level status such as if
the power module is ready or if input voltage is within the start limit.
Note: Some of the conditions that inhibit the inverter from starting are temporally
constrained meaning the condition is fulfilled only after the time delay is passed.
For some of these conditions there are timers that can help debug issues.
Settings
Parameters 173.20...173.30.
Power production status
The status of power production can be monitored from parameter 173.11 Output power
status. This parameter determines the usage limit of the total available input power.
Additionally, the parameter shows if the input voltage is limited or if the inverter is in test
mode. The MPP tracking status indicates that the inverter is producing maximum available
power.
To Next Page
Loading...
Need help?
General