Frequency Limiter; Low Limiter - FujiFilm FVR-Micro Instruction Manual

 Restart mode after momentary power failure (Frequency fall rate) (H14)
During restart after a momentary power failure, if the inverter output frequency and the
idling motor speed cannot be harmonized with each other, an overcurrent will flow,
activating the overcurrent limiter. If it happens, the inverter reduces the output frequency to
match the idling motor speed according to the reduction rate (Frequency fall rate: Hz/s)
specified by H14.
Data for H14
0.00
0.01 to 100.00 (Hz/s)
999
If the frequency fall rate is too high, regeneration may take place at the moment the
motor rotation matches the inverter output frequency, causing an overvoltage trip.
On the contrary, if the frequency fall rate is too low, the time required for the
output frequency to match the motor speed (duration of current limiting action)
may be prolonged, triggering the inverter overload prevention control.
F15, F16
Frequency Limiter (High and Low)
H63
Low Limiter (Mode selection)
F15 and F16 specify the upper and lower limits of the output frequency, respectively.
H63 specifies the operation to be carried out when the output frequency drops below the low
level specified by F16, as follows:
• When H63 = 0, the output frequency will be held at the low level specified by F16.
• When H63 = 1, the inverter decelerates to stop the motor.
• When you change the frequency limiter (High) (F15) in order to raise the
reference frequency, be sure to change the maximum frequency (F03)
accordingly.
• Maintain the following relationship among the data for frequency control:
F15 > F16, F15 > F23 and F15 > F25
F03 > F16
where, F23 is of the starting frequency and F25 is of the stop frequency.
If you specify any wrong data for these function codes, the inverter may not
run the motor at the desired speed, or cannot start it normally.
Inverter's action for the output frequency fall
Follow the selected deceleration time
Follow data specified by H14
Follow the setting of the PI processor in the current limiter.
(The PI constant is prefixed inside the inverter.)
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