VD500 Series Inverter User Manual Parameter Description
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F8-20
Overspeed Detection
Value (FVC)
0.0%~50.0% (max frequency)
20.0%
○
F8-21
Overspeed Detection
Time (FVC)
0.0: No detection
0.1s~60.0s
0.0s
○
This function is valid only when frequency converter is running in a speed sensor vector control.
When the inverter detects the actural speed of motor exceeds the set frequency, excess value is
greater than the overspeed detection value F8-20, and duration time is greater than the over speed
detection time F8-21, frequency converter fault alarm Err. 41, and deal with according to the fault
protection action mode.
F8-22
Large Speed Deviation
Detection Value (FVC)
0.0%~50.0% (max frequency)
20.0%
○
F8-23
Large Speed Deviation
Detection Time (FVC)
0.0: No detection
0.1s~60.0s
0.0s
○
This function is valid only when frequency converter is running in a speed sensor vector control.
When the inverter detects the actural speed of motor and set frequency deviation, deviation value is
greater than the large speed deviation detection value F8-22, and duration time is greater than the
over speed detection time F8-23, frequency converter fault alarm Err. 40, and deal with according to
the fault protection action mode.
When large speed deviation detection time is 0.0, cancel the large speed deviation fault detection.
F8-24
Action Selection Upon
Instantaneous Power
Failure
0: Invalid
1: Decelerate
2: Decelerate to stop
0
○
F8-25
Voltage Restore
Judgment Value Upon
Instantaneous Power
Failure
F0-10~100.0%
90.0%
○
F8-26
Voltage Restore
Judgment Time Upon
Instantaneous Power
Failure
0.00s~100.00s
0.50s
○
F8-27
Voltage Judgment Value
Upon Instantaneous
Power Failure
60.0%~100.0% (Standard bus voltage)
80.0%
○
The function is refers to the instantaneous power failure or voltage falls suddenly, frequency converter
by reducing output rotational speed, reduce the load feedback energy compensation inverter DC bus
voltage is reduced, to keep the inverter to continue to run.
If F8-24 =1, when instantaneous power failure or voltage falls suddenly, frequency converter
deceleration, when the bus voltage returns to normal, inverter normal acceleration to set frequency
operation. Is used as the basis of bus voltage return to normal is bus voltage more than F8-25 set
voltage recovery judging value and duration time more than F8-26 set time. If F8-24=2, when
instantaneous power failure or voltage falls suddenly, inverter deceleration until the stop.
