Dynamic (Regenerative) Braking - For Abrupt Motor Stop - Toshiba TOSVERT VF-PS1 Instruction Manual

 An example of setting when =
Input voltage
Motor speed
• Even after the recovery from an input power failure, the motor continues slowing down to a stop. If the voltage in the
inverter main circuit falls below a certain level, however, control will be stopped and the motor will coast.
• The deceleration time varies according to the setting of . In this case, the deceleration time refers to the
time elapsed before a motor running at  (maximum frequency) comes to a full stop.
• If the voltage in main circuit below  (Under voltage detection level ) at Non-stop control during power failure,
the motor will coast and inverter display is shown "(displayed alternately)". And then, If recovery from
the input power failure, the motor continues coasting.
5.19

Dynamic (regenerative) braking - For abrupt motor stop

  : Dynamic braking selection
 : Dynamic braking resistance
  : Dynamic braking resistor capacity
5
  : Braking resistance overload time
• Function
Dynamic braking is used in the following cases:
1) Need to stop the motor quickly.
2) The inverter trips because of an overvoltage (OP) during deceleration.
3) Fluctuation of load condition causes a regenerative power even at a constant speed such as press machine.
[Parameter setting]
Title




*1) The state of olr trip is excluded.
* Default settings vary from model dependent.  Refer to page E-38, 39.
Protection levels defined by  (Refer to Section 6.15.2).
Note 1: The time set using  is the time for which the resistor sustains an overload. (Enter the time elapsed
before the inverter trips if a load 10 times as large as the dynamic braking resistor capacity specified using
 is applied.) There is no need to change resistance settings recommended by Toshiba (except DGP
resistance setting).
Note 2: If the parameter  is set to  -  (Braking function enabled), the inverter will be set automatically so as to
deal with the regenerative energy from the motor by means of a resistor, without taking any action to limit
overcurrent. (The same function as =)
Note 3: For inverters with ratings of 400V-250kW and above, set  to , because separate dynamic braking units
are not included as standard equipment. 
Deceleration stop
Function
Dynamic braking selection
Dynamic braking resistance
Dynamic braking resistor
capacity
Braking resistance overload
time
Time
Adjustment range
Setting Braking function ST-off
Disabled
 －

Enabled *1)
Enabled
 (It is effective
in trip.

Disabled
condition.)

 Enabled
Enabled
 (It isn't
effective in

Disabled
trip.condition )

~ Ω
~ kW
~ sec.
E-34
E6581386
Default setting
overload
detect
―
protect
not protect
protect

not protect
protect
not protect
protect
not protect
According to model
 Refer to page K-42.
According to model
 Refer to page K-42.
