Toshiba G7 manual Ridethrough Mode, Number of Retries, Dynamic Braking Enable

F302				F304
	Ridethrough Mode		Direct Access Number —	F302
	Program ⇒ Protection Parameters ⇒ Undervoltage/Ridethrough		Parameter Type — Selection List
	This parameter determines the motor-control response of the drive in the event		Factory Default — Off
	of a momentary power outage.		Changeable During Run — Yes
	Settings:
	Off
	Ridethrough
	Stop
	Number of Retries		Direct Access Number —	F303
	Program ⇒ Protection Parameters ⇒ Retry/Restart		Parameter Type — Numerical
	After a trip has occurred, this parameter sets the number of times that an		Factory Default — 00
	automatic system restart is attempted for a qualified trip.		Changeable During Run — Yes
	The trip conditions listed below will not initiate the automatic Retry/Restart		Minimum — 00
	function:		Maximum — 10
	• OCA1, 2, or 3 (Arm Short Ckt),
	• EPH1 (Input Phase Failure),
	• EPH0 (Output Phase Failure),
	•	OCL (Startup Overcurrent),
	• EF1 or 2 (Ground Fault),
	•	EMG (Emergency Off),
	•	EEP1 (EEPROM Fault),
	• Err2 through Err9 (Main RAM/ROM Fault), or
	•	E-10 (Sink/Source Error),
	• 13 (Speed Error), or
	•	17 (Key Error).
	See the section titled General Safety Information on pg. 1 for further
	information on this setting.
	Dynamic Braking Enable		Direct Access Number —	F304
	Program ⇒ Protection Parameters ⇒ Dynamic Braking		Parameter Type — Selection List
	This parameter Enables/Disables the Dynamic Braking system.		Factory Default — Disabled

Settings: Changeable During Run — No

Enabled with Overload

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 drive and providing the proper information at F304, F308, and F309.

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

112 G7 ASD Operation Manual