Toshiba TOSVERT VF-S11 Instruction Manual page 134

Connecting thermal relays and
an external braking resistor
Three-phase main circuits
Power supply
Note 1: A TC (Trip coil) is connected, as shown in this figure, when an MCCB with a trip coil is used instead
Note 2: As a last resort to prevent fire, be sure to connect a thermal relay (THR). Although the inverter has a
6
[Parameter setting]
✩ ✩ ✩ ✩
✩ ✩ ✩ ✩
✩ ✩ ✩ ✩
✩ ✩ ✩ ✩
MCCB
Step-down
transformer
2 : 1
Fuse
Power supply TC
of an MC. A step-down transformer is needed for every 400V-class inverter, but not for any 200V-
class inverter.
means of preventing overload and overcurrent to protect the braking resistor, the thermal relay is
activated in case the protection function fails to work. Select and connect a thermal relay (THR)
appropriate to the capacity (wattage) of the braking resistor.
Title Function
Dynamic braking selection
Overvoltage limit operation
Dynamic braking resistance
Dynamic braking resistor capacity
To connect a dynamic braking resistor, set the overvoltage limit operation parameter
(Disabled).
To use this inverter in applications that create a continuously regenerative status (such as downward
movement of a lift, a press or a tension control machine), or in applications that require slowdown
stopping of a machine with a significant load inertial moment, increase the dynamic braking resistor
capacity according to the operation rate required.
To connect an external dynamic braking resistor, select one with a resultant resistance value greater
than the minimum allowable resistance value. Be sure to set the appropriate operation rate in
and to ensure overload protection.
When using a braking resistor with no thermal fuse, connect and use a thermal relay as a control circuit
for cutting power off.
External braking resistor (optional)
PBR
TH-R
PA PB
MC
R/L1 U/T1
R/L2
V/T2
R/L3
W/T3
Inverter
F
FLB
MC
R
Surge suppressor
FLC CC
FLA
Default setting
1
1
Any value
Any value
F-40
E6581158
Motor
IM
Forward
Reverse
to "1"