SMA SC 200 - Manual (Page 67)

SMA Solar Technology AG External Grid Monitoring Relay (optional)
User Manual SC-BEN100262 67
• Sunny Central with external medium-voltage transformer: set the values in volts. Set the relative
value as a percentage of nominal voltage (105 V are equivalent to 105 % of nominal voltage).
• Frequency thresholds are always set as absolute values in Hertz.
Example:
If a system with 20 kV / 100 V has an overvoltage threshold of 115 V (115 %) and a hysteresis of
5 V (5%), the monitored voltage must fall below 110 V (110 %) in order that the alarm be reset.
Overvoltage Monitoring ON / OFF
ON = Overvoltage monitoring is activated. The
following parameters of this function will be displayed.
OFF = Overvoltage monitoring is deactivated The
following parameters of this function will not be
displayed.
Parameters for "3-wire system": Threshold value for triggering at overvoltage in Level 1
Delay time for threshold value at overvoltage in Level 1
Parameters for "3-wire system": Threshold value for triggering at overvoltage in Level 2
Delay time for threshold value at overvoltage in Level 2
Hysteresis for the overvoltage monitoring; this must be
exceeded before any reconnection is possible.