SMA SC 500CP XT - Manual (Page 84)

10.1.2 Stop
The inverter is switched off. Stop, Fast stop or Remote shutdown active will appear on the touch display. If the key
switch is set to Start, the inverter switches to the operating state "Grid monitoring".
10.1.3 Grid Monitoring
10.1.3.1 Monitoring the Grid Voltage
In the operating state "Grid monitoring", Waiting for valid AC grid appears on the touch display. The grid limits are
monitored continuously from now on. If no grid error occurs during the grid monitoring time, the AC disconnection unit
closes and the inverter switches to the operating state "Grid monitoring time reached". If the grid limits are exceeded
during the monitoring time, the inverter will restart "Grid monitoring".
You can specify the thresholds and the delay time manually. For voltage monitoring, you can set two limits for
overvoltage and two limits for undervoltage. If the grid voltage increases above the value defined in the parameter
VCtlhhLim or VCtlhLim, the inverter waits for the time defined in the parameter VCtlhhLimTm or VCtlhLimTm and
disconnects from the utility grid.
Figure 14: Temporal inverter behavior when the grid limits are exceeded
Position Parameter Description
A VCtlhhLimTm Delay time for grid limit level 2
B VCtlhLimTm Delay time for grid limit level 1
C ‒ Startup/MPP load operation
D ‒ Grid monitoring
E ‒ Disturbance
1 VCtlhhLim Grid voltage limit level 2
2 VCtlhLim Grid voltage limit level 1
3 ‒ Connection limit, maximum nominal voltage deviation
10 Function Description SMA Solar Technology AG
User Manual SCCPXT-BA-E4-en-54 84