Toshiba TOSVERT VF-MB1 User Manual

E6581697
F-47
6
6.15.5 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
DC Voltage
Output
Frequency
 :
Over-voltage stall protection level
[Parameter setting]
Title Function Adjustment range Default setting
f305
Overvoltage limit operation
(Deceleration stop mode
selection)
0: Enabled
1: Disabled
2: Enabled (Quick deceleration control)
3: Enabled (Dynamic quick deceleration
control)
2
f319
Regenerative
over-excitation upper limit
100-160 (%) 120
f626
Overvoltage stall protection
level
100-150 (%) *1
136 (240V class)
141 (500V class)
*1: 100% corresponds to an input voltage of 200V for 240V models or to in 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, 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, and if the inverter is tripped during deceleration because of an overvoltage, specify a larger
value. When
f305 is set 2 or 3,this function works.
, Parameter f626 serves also as a parameter for setting the regenerative braking level.

Toshiba TOSVERT VF-MB1 Specifications

General

Brand	Toshiba
Model	TOSVERT VF-MB1
Category	Inverter
Language	English