Toshiba TOSVERT VF-AS3 Instruction Manual page 304
High-performance industrial inverter for 3-phase motors, 3-phase 240v class 0.4 to 55kw, 3-phase 480v class 0.4 to 280kw
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- Instruction manual (599 pages) ,
- Manual (69 pages) ,
- Quick start manual (68 pages)
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Set <F308: Braking resistance> and <F309: Braking resistor capacity> according to the braking
resistor to be connected.
Set the overload time of braking resistor with <F639: Braking resistor overload time>. Set a value so
that a trip occurs at a value 10 times the <F309: Braking resistor capacity> setting. The default
setting is intended for our recommended braking resistors (DGP600 Series excluded). To use the
DGP600 Series, use the characteristic value of overload relay as a guide.
Set the operation level of dynamic braking with <F626: Overvoltage limit operation level>.
To output an overload of braking resistor, allocate the braking resistor overload (OLr) pre-alarm
(function number: "30" , "31") to the output terminal.
■ Setting example
When using an external braking resistor (option)
4
4
6
9
The above connection is for the case where MCCB or ELCB with a trip coil is used instead of MC for
TC (trip coil).
Prepare a step-down transformer for the 480V class. It is not required for the 240V class.
Important
For an application that requires the continuous regenerative state, such as moving down of a lifting
gear, press and tension control, or when a deceleration stop is performed for a machine with large
load inertial moment, increase the braking resistor capacity according to the operation rate.
6. [Advanced] How to use parameters
In case of external option (with thermal fuse)
MCCB
or
ELCB
PA/
PB
R/L1
U/T1
Power
S/L2
V/T2
supply
T/L3
W/T3
Inverter
MCCB
or
ELCB
Three-phase
power supply
Power
supply
• Be sure to install a thermal relay (THR) to prevent fire.
The inverter is equipped with the functions that protect a braking resistor from overload or
overcurrent. A thermal relay needs to be activated when these protective functions become
disabled.
Select the appropriate thermal relay (THR) according to the braking resistor capacity (watt).
• "Thermal overload relay" is recommended, install it for each motor to be protected.
"Thermal relay with CT" is not available.
External braking resistor (option)
PBR
Motor
M
In case of thermal relay and external braking resistor
TH-R
MC
PBe
PB
R/L1
U/T1
S/L2
V/T2
T/L3
W/T3
Step-down
transformer
Inverter
FLB
Fuse
Surge absorber
FLC
FLA
6-62
E6582062
External braking resistor (option)
PBR
Motor
M
F
Fwd
Rev
R
CC
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