E6581301

b)When a using braking resistor without thermal fuse

*If no power supply is provided for the control circuit"

TH - Ry"

An external braking resistor (optional)" PBR "

 

MCCB"

MC"

PA/+"

PB"

 

Three-phase

 

 

R/L1"

U/T1"

Motor"

 

 

 

main circuit

 

 

S/L2"

V/T2"

IM"

power supply"

 

 

T/L3"

W/T3"

 

 

 

Depression

 

 

 

 

 

 

 

 

transformer"

 

 

 

 

 

2:1

Inverter"

 

 

 

[Note 2]"

 

 

 

 

 

 

 

 

MC"

FLB"

 

 

[Note 1]"

Fuse"

Surge killer"

 

 

 

 

 

FLC"

 

 

Power supply"

TC"

 

 

 

 

 

 

 

FLA"

 

 

5

Note 1: Connection when using an MCCB with a top coil instead of an MC.

Note 2: A depression transformer is required for 400V models but not for 200V models.

[Parameter setting]

Title

Function

Adjustment range

Setting value

 

 

 

 

￿￿

Dynamic braking selection

￿:Disabled

￿

￿~￿:Enabled

 

 

 

￿￿￿

Dynamic braking resistance

￿￿￿~￿￿￿￿ ￿

Any value

￿￿￿￿

Dynamic braking resistor

￿￿￿~￿￿￿￿￿ kW

Any value

continuous capacity

 

 

 

(When the thermal braking resistor option is not used, be sure to set the parameters ￿￿￿ and ￿￿￿￿ properly for overload protection.)

*As a last resort to prevent fire, be sure to connect a thermal relay (Be sure to use bimetals method)"or a thermostat. Although the inverter has a means of preventing overload 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.

-Warning -

In the above circuit, the MC in the main circuit is turned off if an inverter's protective function is activated, and consequently no trip message is displayed. The inverter recovers from a trip if it is turned off. So, check the trip history record after turning off the inverter and then on again. ￿ Refer to Section 8.2.1.

To prevent a trip condition from being cleared by turning off the power and then on again, change the setting of the inverter trip retention selection parameter ￿￿￿￿. ￿ Refer to Section 6.33.2.

E-38

Page 108
Image 108
Toshiba VF-AS1 instruction manual When a using braking resistor without thermal fuse