Toshiba Tosvert VF-AS1 User Manual
Page 101
E6581301
E-35
5
5.19
Dynamic (regenerative) braking - For abrupt motor stop
RD
: Dynamic braking selection
RDT
: Dynamic braking resistance
RDER
: Allowable continuous braking resistance
H
: Braking resistance overload time
[Parameter setting]
Title
Function
Adjustment range
Default setting
RD
Dynamic braking selection
:Deselect
:Select (bracking resistance overload
detect)
: Select (bracking resistance overload not
detect)
RDT
Dynamic braking resistance
~Ω
According to model
RDER
Allowable continuous braking
resistance
~kW
According to model
H
Braking resistance overload time
~ sec.
* Default settings vary from model dependent.
⇒ Refer to page E-40.
Protection levels defined by H (Refer to Section 6.14.2).
Note 1: The time set using H 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 RDER is applied.) There is no need to change resistance settings recommended by Toshiba (except
DGB resistance setting).
Note 2: If RD is set to or , (Dynamic braking selection enabled), set H (Overvoltage limit operation) to .
Note 3: For inverters with ratings of 400V-200kW or more, set RD to , because separate dynamic braking units are
not included as standard equipment.
• 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.