SMA SUNNY CENTRAL CP XT Series - Dynamic Undervoltage Detection

10 Function Description
SMA Solar Technology AG
User ManualSCCPXT-E7-BA-en-58112
10.5.2.3 Dynamic Undervoltage Detection
The dynamic undervoltage detection extends the grid support in the event of undervoltage and changes the switch-off
behavior. The grid limits, which are stepped by default, are replaced by a continuous grid-limit function.
1
2
t
A
100
B
3
Dynamic grid support (FRT)
Grid disconnection
Grid voltage
V /V [%]
Grid
Figure 43: Maximum duration of a voltage dip that the inverter can work through without disconnecting from the utility grid
Position Parameter Description
1 VCtllLim Grid voltage limit level 1
2 VCtlllLim Grid voltage limit level 2
3 − Time at which the inverter disconnects from the utility grid.
A VCtllCharTm The delay time of the dynamic undervoltage detection defines the in-
tersection of the continuous grid-limit function with the time axis.
B VCtllLimTm Delay time for grid limit level 1
The function of the dynamic undervoltage detection is activated via the parameter VCtllCharEna.
The function of the dynamic undervoltage detection is activated by default for Romania.