Powtran PI9000 series - Page 153

Chapter 5 Function parameter
147
This feature means that when the momentary power cut happens or the voltage
suddenly reduces, the drive will reduce the output speed to compensate the reduced value
of the inverter DC bus voltage by using load feedback energy, in order to maintain the
inverter to continue running.
If F8.26 = 1, when the momentary power cut happens or the voltage suddenly
reduces, the inverter will decelerate, when the bus voltage is back to normal, the inverter
will normally accelerate to the set frequency to run. To determine whether the bus voltage
returns to normal or not, check whether the bus voltage is normal and lasts for longer than
the set time by F8.28.
If F8.26 = 2, when the momentary power cut happens or the voltage suddenly
reduces, the inverter will decelerate till to stop.
F8.30
Load drop
protection
selection
Invalid
0
0
☆
Valid
1
Bus voltage
Time
t
Time
t
Running frequency
Time
t
Judgment voltage of
momentary power cut action
F8.29
Running frequency
Voltage protection of
momentary power out
F8.27
(F8.26=1 :
deceleration
)
Voltage protection of
momentary power out
F8.27
(F8.26=2 :
Deceleration
and stop
)
Recovery voltage judgment time
of m omentary power cut
F8.28
Deceleration time
3
Deceleration time
4
Recovery acceleration time
Deceleration time
3
Deceleration time
4
Schematic diagram of momentary power cut action