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In addition to ride-through capability, the inverter is capable of adding or removing VARs
during VRT events to help support voltage regulation during the fault event.
During a grid fault, the inverter maintains its output power set point unless it is operating in
current limit or the reactive current demand consumes the available output current capacity.
Frequency Ride-Through
The inverter has three under-frequency (UF) and three over-frequency (OF) trip points and
times. These parameters are configurable to the ranges listed below.
Trip Point
Frequency Range*
UF Trip Point 3
UF Trip Point 2
UF Trip Point 1
UF Trip Point 0
OF Trip Point 0
OF Trip Point 1
OF Trip Point 2
OF Trip Point 3
*Frequency accuracy 0.2 Hz of nominal
The FQRT settings are pre-programmed in the inverter to comply with IEEE 1547
requirements.
Inverter Frequency Trip Points
Default
Value
35 Hz-70 Hz
3:55
35 Hz-70 Hz
2:57
35 Hz-70 Hz
1:59.5
35 Hz-70 Hz
0:59.5
35 Hz-70 Hz
0:60.5
35 Hz-70 Hz
1:60.5
35 Hz-70 Hz
2:62
35 Hz-70 Hz
3:65
Inverter FQRT Default Settings
Function
Frequency (Hz)
UF1
< 57
UF2
< 59.5
OF1
> 60.5
OF2
> 62
Time
Accuracy
(sec)
0-600
100 ms or 1%, whichever is greater
0-600
100 ms or 1%, whichever is greater
0-600
100 ms or 1%, whichever is greater
0-600
100 ms or 1%, whichever is greater
0-600
100 ms or 1%, whichever is greater
0-600
100 ms or 1%, whichever is greater
0-600
100 ms or 1%, whichever is greater
0-600
100 ms or 1%, whichever is greater
Clearing Time (s)
0.16
2
2
0.16
43

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