Toshiba TOSVERT VF-MB1 Instruction Manual page 163

6.15.4 Dynamic (regenerative) braking - For abrupt motor stop
f304 : Dynamic braking selection
f308 : Dynamic braking resistance
f309 : Dynamic braking resistor capacity
f626 : Over-voltage stall protection level
 Function
The inverter does not contain a braking resistor. Connect an external braking resistor in the following
cases to enable dynamic braking function:
1) when decelerating the motor abruptly or if overvoltage tripping ( op ) occurs during deceleration
stop
2) when a continuous regenerative status occurs during downward movement of a lift or the winding-
out operation of a tension control machine
3) when the load fluctuates and a continuous regenerative status results even during constant speed
operation of a machine such as a press
[Parameter setting]
Title
Dynamic braking selection
f304
Dynamic braking resistance
f308
Dynamic braking resistor
f309
capacity
Over-voltage stall protection
f626
level
Assigning the braking resistor overload pre-alarm (function number : 30,31) to any logic output terminal,
overload status of braking resistor can be output.
Note 1) The operation level of dynamic braking is defined by parameter f626 .
Note 2) If parameter f304 =1 to 4, 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 overvoltage. (The
same function as f305 =1)
Function
0: Disabled
1: Enabled, Resistor overload
protection enabled
2: Enabled
3: Enabled, Resistor overload
protection enabled
(At ST terminal on)
4: Enabled (At ST terminal on)
1.0-1000 (  )
0.01-30.00 (kW)
100-150 (%)
F-43
Adjustment range
E6581697
6
Default setting
0
Depending on
models
(See Section 11.4)
136 (240V class)
141 (500V class)