Dynamic (Regenerative) Braking - For Abrupt Motor Stop - Toshiba 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.
5.19

Dynamic (regenerative) braking - For abrupt motor stop



 : Allowable continuous braking resistance
 : Braking resistance overload time
5
• 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




* 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 allowable continuous braking resistance 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  or  (regenerative braking selected), 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 or more, set  to , because separate dynamic braking units are
not included as standard equipment.
Deceleration stop
: Dynamic braking selection
: Dynamic braking resistance
Function
Dynamic braking selection
Dynamic braking resistance
Allowable continuous braking
resistance
Braking resistance overload time
Time
Adjustment range
:Disabled
:Enabled (braking resistance overload
detect)
:Select (braking resistance overload
not detect)
~ Ω
~ kW
~ sec.
E-34
E6581386
Default setting

According to model
⇒ Refer to page K-41.
According to model
⇒ Refer to page K-41.
