Dynamic (Regenerative) Braking - For Abrupt Motor Stop - Toshiba Tosvert VF-AS1 Instruction Manual

Input voltage
Synchronized
acceleration/dece
leration signal
(S1 terminal)
Motor speed
*1:Even with =,, functions are used, a motor may coast according to load conditions.
In this case, try to adjust the parameter "" and "".
5.19

Dynamic (regenerative) braking - For abrupt motor stop

  : Dynamic braking selection
 : Dynamic braking resistance
  : 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




* Protection levels defined by  (Refer to Section 6.14.2).
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-200kW and above, set  to , because separate dynamic braking units
are not included as standard equipment. 

ON
Inverter 1

Inverter 2
Function
Dynamic braking selection
Dynamic braking resistance
Allowable continuous braking
resistance
Braking resistance overload
time
*1


Adjustment range
:Disabled
:Enabled (bracking resistance overload
detect)
:Enabled (bracking resistance overload
not detect)
~ Ω
~ kW
~ sec.
E-36
E6581442
Time

Default setting

According to model
 Refer to page K-48.
According to model
 Refer to page K-48.
