Avoiding Overvoltage Trip; Difference In Specific Settings - Toshiba TOSVERT VF-AS3 Instruction Manual

6. 15. 5
<F305: Overvoltage limit operation>
<F319: Regenerative over-flux upper limit>
<F626: Overvoltage limit operation level>
■ Function
These parameters are used to temporarily maintain the output frequency constant or increase the
4 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).
4
6
Important
■ Parameter setting
Title
9
F305
F319
F626
*1 Depending on the setup menu. For details, refer to [11. 6].

■ 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.
6. [Advanced] How to use parameters

Avoiding overvoltage trip

• During overvoltage limit operation, deceleration time may be longer than the time set.
• During overvoltage limit operation, the overvoltage (OP) pre-alarm is displayed.
Parameter name
Overvoltage limit
operation
Regenerative over-flux
upper limit
Overvoltage limit
operation level
F305 : Overvoltage limit operation
0: Enabled
1: Disabled
2: Enabled(quick deceleration)
3: Enabled(dynamic quick dec)
Adjustment range
0: Enabled
1: Disabled
2: Enabled (quick deceleration)
3: Enabled (dynamic quick deceleration)
100 - 160
100 - 150
6-64
E6582062
STOP 0.0Hz
13:18
Unit Default setting
2
% *1
%
*1
134