Toshiba VF-FS1 - Manual (Page 132)

E6581381
F-36
6
6.12.4 Avoiding overvoltage tripping
H : Overvoltage limit operation
H : Overvoltage stall protection level
• Function
These parameters are used to keep the output frequency constant or increase it to prevent
overvoltage tripping in case the voltage in the DC section rises during deceleration or varying speed
operation. The deceleration time during overvoltage limit operation may increase above the
designated time.
Overvoltage limit operation level
DC Voltage
Output
Frequency
H Over-voltage stall protection level
[Parameter setting]
Title Function Adjustment range Default setting
H
Overvoltage limit operation
(Slowdown stop mode selection)
0: Enabled
1: Disabled
2: Enabled (Quick
deceleration)
3: Enabled (Dynamic quick
deceleration)
2
H Overvoltage limit operation level 100-150% 140
+ If H is set to (quick deceleration), the inverter will increase the voltage to the motor (over-
excitation control) to increase the amount of energy consumed by the motor when the voltage reaches the
overvoltage protection level, and therefore the motor can be decelerated more quickly than normal
deceleration.
+ If H is set to (dynamic quick deceleration), the inverter will increase the voltage to the motor
(over-excitation control) to increase the amount of energy consumed by the motor as soon as the motor
begins to slow down, and therefore the motor can be decelerated still more quickly than quick
deceleration.