Toshiba G7 Manual De Usuario
198
G7 ASD Operation Manual
Dynamic Braking Resistor Wire/Cable
Specifications
When using a Dynamic Braking Resistor (DBR), use thermal protection and an input contactor that will
open the input 3-phase power circuit to the ASD in the event that a DBR over-temperature condition
occurs. In the event of a power source over-voltage condition or an ASD failure the input contactor will
prevent hazardous DBR temperatures.
open the input 3-phase power circuit to the ASD in the event that a DBR over-temperature condition
occurs. In the event of a power source over-voltage condition or an ASD failure the input contactor will
prevent hazardous DBR temperatures.
Because the heat generated by the DBR will affect the cooling capacity of the heatsink, the resistor pack
should be mounted above or to the side of the ASD — Never below the ASD. Maintain a minimum of six
inches between the resistor pack and the ASD unit.
should be mounted above or to the side of the ASD — Never below the ASD. Maintain a minimum of six
inches between the resistor pack and the ASD unit.
Heavy duty DBRs should be wired using the same gauge wire as the motor leads. Light duty DBRs may
use one wire size smaller (AWG) than the motor leads.
use one wire size smaller (AWG) than the motor leads.
The total wire length from the ASD to the DBR should not exceed ten feet.
The wiring from the ASD to the DBR should be twisted approximately two twists per foot throughout the
length of the wire.
length of the wire.
If EMI/RFI noise is of concern, the DBR wiring should be three-core screened cable. The screen should
connect to the ASD enclosure and the resistor enclosure.
connect to the ASD enclosure and the resistor enclosure.