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6. [Advanced] How to use parameters 6-64
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6. 15. 5 Avoiding overvoltage trip
<F305: Overvoltage limit operation>
<F319: Regenerative over-flux upper limit>
<F626: Overvoltage limit operation level>
â– Function
These parameters are used to temporarily maintain the output frequency constant or increase the
frequency to prevent overvoltage tripping when the voltage in the DC section rises during
deceleration or while constant speed run is in progress (overvoltage limit operation).
â– Parameter setting
â– Difference in specific settings
<F305: Overvoltage limit operation> = "2"
This value sets quick deceleration.
When the voltage reaches the overvoltage limit operation level during deceleration, the motor may
be decelerated more quickly than normal deceleration by increasing the voltage to be applied to the
motor (over-excitation control) to increase the amount of energy consumed by the motor.
<F305: Overvoltage limit operation> = "3"
This value sets dynamic quick deceleration.
The motor may be decelerated more quickly than quick deceleration by increasing the voltage to be
applied to the motor (over-excitation control) to increase the amount of energy consumed by the
motor as soon as the motor starts decelerating.
Important
• During overvoltage limit operation, deceleration time may be longer than the time set.
• During overvoltage limit operation, the overvoltage (OP) pre-alarm is displayed.
Title Parameter name Adjustment range Unit Default setting
F305 Overvoltage limit
operation
0: Enabled
1: Disabled
2: Enabled (quick deceleration)
3: Enabled (dynamic quick deceleration)
2
F319 Regenerative over-flux
upper limit
100 - 160 %
*1
*1 Depending on the setup menu. For details, refer to [11. 6].
F626 Overvoltage limit
operation level
100 - 150 %
134
*1
0: Enabled
1: Disabled
0.0HzSTOP
13:18
F305 : Overvoltage limit operation
2: Enabled(quick deceleration)
3: Enabled(dynamic quick dec)
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