Avoiding Overvoltage Tripping - Toshiba Tosvert VF-S15 Instruction Manual

6.19.5 Avoiding overvoltage tripping

f305 : Overvoltage limit operation
f319 : Regenerative over-excitation upper limit
f626 : 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
Output
Frequency
DC Voltage
[Parameter setting]
Title
Overvoltage limit operation
(Deceleration stop mode
f305
selection)
Regenerative
f319
over-excitation upper limit
Overvoltage stall protection
f626
level
*1: Default setting values vary depending on the setup menu setting. Refer to section 11.5.
*2: 100% corresponds to an input voltage of 200V for 240V models or to an input voltage of 400V for 500V
models.
● If f305 is set to 2 (quick deceleration control), 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 during deceleration, and therefore the motor can be decelerated more quickly
than normal deceleration.
● If f305 is set to 3 (dynamic quick deceleration control), 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 deceleration, and therefore the motor can be decelerated still more quickly than quick
deceleration.
● During overvoltage limit operation, the overvoltage pre-alarm (p blinks) is displayed.
● The parameter f319 is used to adjust the maximum energy that the motor consumes during
deceleration. Specify a larger value if the inverter trips during deceleration because of an overvoltage.
When f305 is set 2 or 3, this function works.
● Parameter f626 serves also as a parameter for setting the regenerative braking level.
 : Over-voltage stall protection level
Function
0: Enabled
1: Disabled
2: Enabled (Quick deceleration control)
3: Enabled (Dynamic quick deceleration
control)
100-160 (%)
100-150 (%) *2
F-73
Adjustment range
E6582175
6
Default setting
2
120*1
136 (240V class)
141 (500V class)