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]