Dynamic Braking - Abrupt Motor Stop - Toshiba TOSVERT VF-AS3 Instruction Manual

6. 15. 4

Dynamic braking - Abrupt motor stop

<F304: Dynamic braking, OLr trip>
<F308: Braking resistance>
<F309: Braking resistor capacity>
<F626: Overvoltage limit operation level>
<F639: Braking resistor overload time>
■ Function
The dynamic braking function can be enabled by connecting an external braking resistor.
• When an abrupt deceleration is necessary
• When an overvoltage "OP" trip occurs at a deceleration stop
• When the continuous regenerative state, such as moving down of a lifting gear and winding-out
operation for tension control, is entered
• When the regenerative state is entered by load fluctuation during constant speed run of a press
machine, etc.
■ Parameter setting
Title Parameter name
F304 Dynamic braking, OLr trip
F308 Braking resistance
F309 Braking resistor capacity
F626 Overvoltage limit
operation level
F639 Braking resistor overload
time
*1 Depending on capacity, refer to [11. 6].
■ How to use
To use dynamic braking, set <F304: Dynamic braking, OLr trip> to "1" - "8" (dynamic braking
enabled). At this time, the overvoltage limit operation is automatically disabled as in the case of
<F305: Overvoltage limit operation> ="1: Disabled", and the regenerative energy of the motor is
consumed by a braking resistor. (Refer to [6. 15. 5].)
F304 : Dynamic braking,OLr trip
0: Disabled
1: Regen power ride-through
2: Dec stop at power failure
3: Synchronized Acc/Dec(TB)
4: Synch Acc/Dec TB+power failure
Adjustment range
0: Disabled
1: Enabled, OLr trip
2: Enabled, No OLr trip
3: Enabled (except during ST OFF), OLr trip
4: Enabled (except during ST OFF), No OLr
trip
5: Enabled (except during trip), OLr trip
6: Enabled (except during trip) ,No OLr trip
7: Enabled (except during trip & ST OFF),
OLr trip
8: Enabled (except during trip & ST OFF), No
OLr trip
0.5 - 1000
0.01 - 600.0
100 - 150
0.1 - 600.0
6-61
E6582062
STOP 0.0Hz
13:17
Unit Default setting
0
Ω
*1
kW
*1
% 134
s 5.0
6. [Advanced] How to use parameters
3
4
6
9