Toshiba Tosvert VF-A5 - Manual (Page 23)

Example 5 When using built-in braking resistor
(Note) Move PR1 wiring to PB1
(For 3.7kW and smaller units)
Setting: Set I Pbi in parameter group C r . P r
(dynamic braking selection) to 5 (dynamic
braking with overload detection).
The built-in braking resistor is connected to the
PB1 terminal (refer to page 23) at shipment.
Example 6 When connecting a braking resistor (optional)
Note) Select a braking resistor that is higher than the min. tolerable resistance value (refer to page 95). For
22kW and larger units, the separate GTR7 (dynamic braking circuit) option is required,
a) When using an optional braking resistor with temperature fuse
Setting: for 5.5kW and larger units, set I P b I in
parameter group ü r . P r (dynamic braking
selection) to S (dynamic braking with overload
detection).
Braking resistor
When using the built-in braking resistor with 3.7kW and smaller units, avoid the use of an external braking
resistor. However, parallel connection is possible in the following combinations. (For max. braking rate
applications)
Buift-in braking
resistor
Minimum external resistor
value that can be used with the
built-in braking resistor
Min. total braking
resistance value
200V systems 2.2kW and smaller 70n 70n 3sn
3.7kW 40n 40n 20n
400V systems 3.7kW and smaller 150n 150n 75Í1
b) When using an optional braking resistor without temperature fuse
TH-Ry is used as a fire prevention fail-safe.
DBR overload and overcurrent protection
functions are incorporated in the inverter
for protection of the braking resistor, but
TH-Ry
operates if those protective
functions are not possible. Select TH-Ry
according to the DBR power rating.
(dynamic braking selection) to 2 (dynamic
braking with overload detection), and set the
braking resistor capacity and resistance value.
(Refer to I Pbc I | P b C P I on page 77.)
Note) The step-down transformer does not need to be installed for 200V class inverters.
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