Avoiding Over-Voltage Trip; Adjusting The Output Voltage And Voltage Compensation - Toshiba TOSVERT VF-P7 Instruction Manual

6.13.5 Avoiding over-voltage trip

 ：Over-voltage stall protection
 ：Over-voltage stall protection level (high response)
 ：Over-voltage stall protection level
・Function
The functions automatically keep constant or increase the output frequency to prevent
tripping due to over-voltage in the DC bus during deceleration or constant-speed run. When
the over-voltage stall protection is active, it may take longer than the deceleration time.
Maximum frequency
Output frequency
Set deceleration time
DC voltage
∼
∼
[Parameter setting]
Title
 Over-voltage stall protection
Over-voltage stall protection level

(high response)
 Over-voltage stall protection level
＊ serves also as the level of dynamic (regenerative) braking operation.(Refer to 6.13.4)

6.13.6 Adjusting the output voltage and voltage compensation

 ：Voltage of base frequency
 ：Selection of base frequency voltage
・Function
Voltage of base frequency (output voltage adjustment)
This parameter set the base frequency  voltage. And this parameter can make it so that no
voltage exceeding the  value is put out. (This function is active when  is set  or .)
Selection of base frequency voltage (voltage compensation)
The function keeps the V/f ratio constant for prevention of torque drop at low speeds
even when the input voltage drop.
○Voltage compensation... The V/f ratio is kept constant even at input voltage fluctuation.
○Voltage limitation ... The output voltage is limited to . If the voltage compensation fun
[Parameter setting]
Title
Base frequency voltage #1

(output voltage adjustment)
Base frequency voltage

(voltage compensation)
☆If
 is set at  or , the output voltage varies with the input voltage.
☆The output voltage does not exceed the input voltage, even if the base frequency voltage
() is set above the input voltage
← Over voltage stall protection level (high response) / 
← Over voltage stall protection level / 
Function
: Enabled, : Disabled,
: Enabled (forced quick deceleration)
∼ [%]
∼ [%]
ction is disabled, no limitation is imposed to the output voltage.
Function
∼ [V]
: without voltage compensation(limitless output voltage)
: with voltage compensation(limitless output voltage)
: without voltage compensation(limited output voltage)
: with voltage compensation(limited output voltage)
.
F-28
If DC voltage rise and reach the level set
up by , output frequency will be
controlled in order to control this rise. If DC
voltage rise more and reach the level set
up by , this control operation is
performed with high response.
Real deceleration time (differ from regenerative power)
Adjustment range
(output voltage adjustment)
(voltage compensation)
Adjustment range
Default setting



Default setting
 [V]
/ [V]
