Veichi JT550 Series Manual page 108

Chapter 7 Maintenance and Troubleshooting
F9.54
continuing to run upon fault
0: Current running frequency
1: Set frequency
2: Frequency upper limit
3: Frequency lower limit
4: Backup frequency upon abnormality
F9.55
If a fault occurs during the running of the inverter and the handling of fault is set to "Continue to run",
the inverter displays A** and continues to run at the frequency set in F9.54.
The setting of F9.55 is a percentage relative to the maximum frequency.
Action selection at
F9.59
instantaneous power failure
Action pause judging voltage
F9.60 at instantaneous power
failure
Voltage rally judging time at
F9.61
instantaneous power failure
Action judging voltage at
F9.62
instantaneous power failure
Upon instantaneous power failure or sudden voltage dip, the DC bus voltage of the inverter reduces.
This function enables the inverter to compensate the DC bus voltage reduction with the load feedback energy
by reducing the output frequency so as to keep the inverter running continuously.
If F9.59 = 1, upon instantaneous power failure or sudden voltage dip, the inverter decelerates. Once
the bus voltage resumes to normal, the inverter accelerates to the set frequency. If the bus voltage remains
normal for the time exceeding the value set in F9.61, it is considered that the bus voltage resumes to normal.
If F9.59 = 2, upon instantaneous power failure or sudden voltage dip, the inverter decelerates to stop.
F9.63 Protection upon load becoming 0
F9.64 Detection level of load becoming 0
F9.65 Detection time of load becoming 0
If protection upon load becoming 0 is enabled, when the output current of the inverter is lower than the
detection level (F9.64) and the lasting time exceeds the detection time (F9.65), the output frequency of the
inverter automatically declines to 7% of the rated frequency. During the protection, the inverter automatically
accelerates to the set frequency if the load resumes to normal.
F9.67 Over-speed detection value
F9.68 Over-speed detection time
This function is valid only when the inverter runs in the FVC mode.
If the actual motor rotational speed detected by the inverter exceeds the maximum frequency and the
excessive value is greater than the value of F9.67 and the lasting time exceeds the value of F9.68, the inverter
reports Err43 and acts according to the selected fault protection action.
If the over-speed detection time is 0.0s, the over-speed detection function is disabled.
Detection value of too large
F9.69
Detection time of too large speed
F9.70
This function is valid only when the inverter runs in the CLVC mode.
If the inverter detects the deviation between the actual motor rotational speed detected by the inverter
and the set frequency is greater than the value of F9.69 and the lasting time exceeds the value of F9.70, the
inverter reports Err42 and according to the selected fault protection action.
If F9.70 (Detection time of too large speed deviation) is 0.0s, this function is disabled.
Frequency selection for
Backup frequency upon
abnormality
speed deviation
deviation
Range:0~4
Range:60.0%~100.0%
Range:0~2
Range:80.0%~100.0%
Range:0.00s~100.00s
Range:60.0%~100.0%
Range:0~1
Range:0.0%~100.0%
Range:0.0s~60.0s
Range:0.0%~50.0%(max.freq)
Range:0.0s~60.0s
Range:0.0%~50.0%(maximum
frequency)
Range:0.0s~60.0s
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JT550 Series Inverter Manual
Default:0
Default:100.0%
Default:0
Default:90.0%
Default:0.50s
Default:80.0%
Default:0
Default:10.0%
Default:1.0s
Default:20.0%
Default:5.0s
Default:20.0%
Default:0.0s