SMA SC 500HE-US - Manual (Page 52)

9 Grid Monitoring SMA America, LLC
52 SC500HEUS-eng-BE-BUS120320 Operating Manual
Figure 19: Parameters for monitoring the line voltage
9.3 Monitoring the Power Frequency
For the power frequency monitoring, two limiting values in percent are defined for the minimum power
frequency and one limiting value in percent is defined for the maximum power frequency, in
accordance with IEEE 1547.
If the power frequency falls below the value defined in the parameter "HzCtllLim" or "HzCtlllLim", the
Sunny Central waits for the period defined in the parameter "HzCtllLimTm" or "HzCtlllLimTm" and
disconnects from the power distribution grid.
If the power frequency increases above the value defined in the parameter "HzCtlhLim", the
Sunny Central waits for the period defined in the parameter "HzCtlhLimTm" and disconnects from the
power distribution grid.
Parameters Explanation Default value
"VCtlllLim" The second limiting value for the undervoltage 50%
"VCtlllLimTm" Time period for the second limiting value of the undervoltage 160 ms
"VCtllLim" The first limiting value of the undervoltage 88%
"VCtllLimTm" Time period for the first limiting value of the undervoltage 2 000 ms
"VCtlhLim" The first limiting value for the overvoltage 110%
"VCtlhLimTm" Time period for the first limiting value for the overvoltage 1 000 ms
"VCtlhhLim" The second limiting value for the overvoltage 120%
"VCtlhhLimTm" Time period for the second limiting value of the overvoltage 160 ms