Toshiba W7 manual Dynamic Braking Enable, Dynamic Braking Resistance

Dynamic Braking Enable Dynamic Braking Resistance Capacity

Dynamic Braking Enable

Program Protection Settings Dynamic Braking Enable

This parameter⇒Enables/Disables the⇒Dynamic Braking system.

Settings:

Enabled

Disabled

Dynamic Braking

Dynamic Braking uses the inertial energy of the load to produce a braking force or it may be used to reduce the bus voltage in an attempt to preclude an overvoltage trip during deceleration. The inertial energy of the load drives the rotor and induces a current into the stator of the motor.

The induced stator current (energy) is dissipated through a resistive load. The resistive load is connected across terminals PA and PB (non-polarized). Using a low-value, high-wattage resistance as a load for the generated current, the resistive load dissipates the induced energy. The dissipated energy is the energy that would otherwise have caused the rotor to continue to rotate.

Dynamic Braking helps to slow the load quickly; it cannot act as a holding brake.

The Dynamic Braking function may be setup and enabled by connecting a braking resistor from terminal PA to PB of the ASD and providing the proper information at the DBR parameters: Dynamic Braking Resistor (DBR)

Capacity, Dynamic Braking Resistance, and DC Injection Braking Current.

For additional information on selecting the proper resistance value for a given application contact Toshiba’s Marketing Department.

Parameter Type — Selection List

Factory Default — Disabled

Changeable During Run — No

Dynamic Braking Resistance

Program	⇒	Protection Settings	⇒	Dynamic Braking Resistance	Parameter Type — Numerical
					Factory Default — (ASD-dependent)
This parameter is used to input the resistive value of the Dynamic Braking
Resistor.					Changeable During Run — No
Note: Using a resistor value that is too low may result in system					Minimum — 1.0
damage.					Maximum — 1000.0
					Units — Ω
Dynamic Braking Resistance Capacity
Program		Protection Settings		Dynamic Braking Resistance	Parameter Type — Numerical
Capacity					Factory Default — (ASD-dependent)
This parameter is used to input the wattage of the Dynamic Braking Resistor.					Changeable During Run — No
For additional information on selecting the proper resistor wattage value for a					Minimum — 0.01
given application contact Toshiba’s Marketing Department.
Note: Using a resistor with a wattage rating that is too low may					Maximum — 600.0
result in system damage.			⇒		Units — kW
68	⇒				W7 ASD Installation and Operation Manual