Grid Monitoring; Monitoring The Grid Voltage - SMA SUNNY CENTRAL 500CP XT User Manual

SMA Solar Technology AG

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 contactor 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.
V
grid
1
2
3
V
nom
4 5
Figure 14: Temporal inverter behavior when the grid limits are exceeded
Position Parameter
A VCtlhhLimTm
B VCtlhLimTm
C ‒
D ‒
E ‒
1 VCtlhhLim
2 VCtlhLim
3 ‒
4 ‒
5 ‒
User Manual
A
B
6
Description
Delay time for grid limit level 2
Delay time for grid limit level 1
Startup/MPP load operation
Grid monitoring
Disturbance
Grid voltage limit level 2
Grid voltage limit level 1
Connection limit, maximum nominal voltage deviation
Grid limit level 1 is breached, timer for B starts counting
Grid limit level 2 is breached, timer for A starts counting
8
7
10 Function Description
Operating state
Grid voltage
C
D
E
t
9
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