Baldor MN770 manual Section Technologies, Overview, Drive Performance Comparison, Feature

Section 2

Technologies

Overview	Baldor Electric manufactures six drive types for the elevator industry. Each drive type
	(Control and Motor) is best suited for a specific application.
	These Series ªHº Controls are:
	￿	15H	Inverter
	￿	17H	Vector (Encoderless)
	￿	18H	Vector
	￿	19H DC SCR
	￿ 20H DC SCR (Line Regenerative)
	￿ 21H Inverter (Line Regenerative)
	￿ 22H		Vector (Line Regenerative)

These Baldor Series ªHº controls all use the same keypad and display interface. This makes it easy to become familiar with the programming and operation of the controls. Set-up time of the control and motor is greatly reduced due to the automated features ªAuto-Tuneº that are available within these controls.

The purpose of this section is to review each technology type to make it easier to choose a drive for an application. Table 2-1 provides a brief overview of drive performance for each technology type.

Table 2-1 Drive Performance Comparison

Feature	DC SCR	Inverter	Vector
Operating speed range	0 RPM to Base Speed	10% of Base Speed	0 RPM to Base Speed
(for elevators)		to Base Speed.
Relative constant torque speed	Wide	Narrow	Widest
range	20:1	5:1 - 10:1	Base Speed:1
Speed Control	Yes	Yes	Yes
Torque Control	Yes	No	Yes
Positioning￿	Yes￿	No	Yes￿
	(Encoder or resolver feedback)
Speed regulation:	± 1 - 2% of base speed	± 3% of base speed ￿	± 0.5 to 1% of set speed
Open Loop
Closed Loop	± 1% of set speed	± 1% of set speed	± 0.05% of set speed
Continuous full rated torque at	No	No	Yes
zero speed
Available peak torque	150% +	115 - 150%	150% +
Motor Brushes?	Yes	No	No

￿Motion controller required for positioning.

￿Requires encoder or resolver feedback.

￿Depends on motor size and percent slip.

MN770 Technologies 2-1