7 grid monitoring, 1 how grid monitoring works, 2 grid monitoring for grid voltage – SMA SC 500HE-20 User Manual
Page 57: Grid monitoring, How grid monitoring works, Grid monitoring for grid voltage
SMA Solar Technology AG
7 Grid Monitoring
Operating Manual
SCxxxHE-20-BE-BEN111210
57
7 Grid Monitoring
7.1 How Grid Monitoring Works
The Sunny Central monitors the power distribution grid to make sure it stays within a definable range
of limiting values. If these limiting values are exceeded for a set time period, the Sunny Central will
disconnect itself from the grid for safety reasons.
The following limiting values are monitored:
• Voltage loss protection
• Voltage increase protection
• Frequency loss protection
• Frequency increase protection
A tripping delay time for how long the grid failure must be present before the Sunny Central
disconnects from the grid can be set for each limiting value.
7.2 Grid Monitoring for Grid Voltage
Figure 22: Temporal behavior of the Sunny Central when exceeding the grid limits
Object Parameters
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