This setting is used to control real power based on the frequency excursion
This setting is applicable when Rule21 Standards are selected.
Start Freq: 60.50Hz
WGradient: 040%
Figure 6.37 Freq-Watt (1)
Start Freq: This is the frequency that active power reduction starts.
WGradient: This is the active power reduction rate in terms of the frequency.
Stop Freq: This is the frequency that stops the correction cycle.
Hysteresis: This indicates whether hysteresis is enabled.
f stop
f start
Reduced
Power
f
Wgradient
Hysteresis
Figure 6.38 Freq-Watt (2)
This function is for maintenance personnel only, wrong operation
will prevent the inverter from reaching maximum power.
→
6. Normal operation6. Normal operation
Mode 08 :
Figure 6.34 Power Rate Limit
Power Rate:016%
RateP_Sts-US:STOP
Over frequency load shedding Fstart range 60~62Hz, default setting 60.2Hz
Fstop can set the scope: 61-64Hz, the default setting 62Hz.
Press the Enter key to select the mode or frequency.
Press Up/Down to set. Press ESC to save the settings.
Figure 6.36 Freq-Watt characteristic
f min
f nom f start f maxf stop
100% of
Available
Power
0
Grid Frequency
6.7.8.3 Freq Derate Set
There are 5 derate modes in this menu. When operating under standard UL-1741 limits,
modes 00 to 03 are disabled. Mode 04 is used for UL1741SA frequency derating setting.
Mode 08 is used for RULE21 Freq-watt setting. This sets the f start and f stop point.
Mode 04 :
Figure 6.35 Freq Derate Set
Derate Mode:04
OV-F-Start: 60. 20Hz
6.7.8.2 Power Rate Limit
This function is used for change Power Ramp-up rate. When inverter start up or input string
MPPT changes, inverter power ramp-up rate is limited in this menu.
The default setting is stop (disable).
The setting range from 10% to 600%, means inverter power change rate per minute.
Values are not allowed to change. If they are set, they may not conform to the UL1741SA
standard.
This setting is applicable when UL Standards are selected.
.57..56.
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