Baldor mn722 manual Section General Information

Section 2

General Information

Overview	The Baldor Series 22H Line Regen Vector Control provides full motoring and line
	regeneration to the AC power mains with a near unity power factor. The control uses
	PWM controlled by IGBT power transistors in both the converter and inverter sections of
	the control to provide 3 phase power to the motor and Regen power to the line. Flux
	vector technology (sometimes referred to as Field Oriented Control) is a closed loop
	control scheme that adjusts the frequency and phase of voltage and current applied to a
	three phase induction motor. The vector control separates the motor current into it’s flux
	and torque producing components. These components are independently adjusted and
	vectorially added to maintain a 90 degree relationship between them. This produces
	maximum torque from base speed down to and including zero speed. Above base
	speed, the flux component is reduced for constant horsepower operation. In addition to
	the current, the electrical frequency must also be controlled. The frequency of the
	voltage applied to the motor is calculated from the slip frequency and the mechanical
	speed of the rotor. This provides instantaneous adjustment of the voltage and current
	phasing in response to speed and position feedback from an encoder mounted on the
	motors’ shaft.
	The Line Regen vector control provides several advantages over non-regenerative
	drives:
	Regenerated energy from the motor is returned to the power source. The
	control can provide regenerated energy absorption up to it’s full rating on a
	continuous basis.
	Input current is controlled to be a near unity power factor at rated load.
	Line harmonic distortion is reduced.
	DC Bus voltage is always controlled. Therefore, line voltage transients do not
	affect the output voltage to the motor.
	The Baldor Series 22H control may be used in many different applications. It may be
	programmed by the user to operate in different operating zones. It can also be
	configured to operate in a number of modes depending upon the application
	requirements and user preference.
	It is the responsibility of the user to determine the optimum operating zone and mode to
	interface the control to the application. These choices are made with the keypad as
	explained in the programming section of this manual.

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