Baldor MN770 manual Vector, 17H & 18H Controls, 22H Control

Vector	Series 17H	Encoderless Vector
	Series 18H	Vector
	Series 22H Vector (Line Regenerative)
	Vector drives are used in elevator applications where speeds range from 50 to over 700
	FPM. Baldor is a pioneer in Flux Vector Technology and we continue to be the leader in
	new product development with our Series 18H Vector Drive, Series 22H Line REGEN
	Vector Drive and our recently introduced 17H Encoderless Vector Drive.
	These are three phase, variable voltage and variable frequency controls. Like an inverter,
	the control converts AC input voltage to a fixed voltage DC bus supply. This bus is then
	converted into a synthesized AC Sinewave to the motor. The Vector control precisely
	controls current into the motor allowing the motor to produce less internal heating
	resulting in more continuous torque.
	The name Vector Drive comes from the mathematical analysis of the electrical circuit
	formulas governing motor performance. This mathematical analysis uses a vector
	coordinate system. By monitoring the relative position of the motor's rotor with respect to
	the stator, the vector drive can determine how much of the applied AC stator current will
	produce torque and how much will produce heat. The vector drive continuously monitors
	the rotor position and changes the vector of applied stator voltage to maintain peak motor
	performance.
	Vector drives sense the rotor position by monitoring a position feedback device (encoder)
	mounted or directly coupled to the motor shaft. The most common feedback device used
	with vector drives is an incremental encoder. Resolvers are sometimes used when
	environmental conditions are severe. Baldor vector drive motors are supplied with rugged
	H25 encoders that provide 1024 pulses per revolution (PPR) with quadrature.
	Since the control uses standard encoder feedback (except 17H), regulation is very good
	at 0.1% of set speed. Full rated torque is available from base speed to zero speed. Since
	an AC induction motor is used, no brush maintenance is required as with a DC motor.
17H & 18H Controls	The control may be programmed to operate in one of four operating zones; standard
	constant torque, standard variable torque, quiet constant torque or quiet variable torque.
	For elevator applications, only the quiet constant torque or quiet variable torque modes
	are used. The control can also be configured to function in a number of operating modes
	for custom operation. These choices are programmed using the keypad as explained in
	the programming section of this manual.
	Regenerated power from the motor is applied back to the DC Bus and must be dissipated
	by REGEN Hardware (resistive load). The REGEN hardware is selected based on the
	power to be dissipated. The amount of power, duration and frequency of the braking must
	be taken into consideration when sizing these resistors.
22H Control	The Series 22H Vector is a line regenerative control. Regenerated power is applied back
	to the incoming power lines.

Regenerated power from the motor is applied to the incoming AC power lines. The Series 22H control meets IEEE 519 (1992) for total harmonic distortion. By returning the excess power back to the line, energy use is reduced for the building. The lower THD causes fewer power problems for sophisticated equipment on the same power grid. No external dynamic braking hardware is required.

2-4 Technologies MN770