Section 2Technologies
Technologies 2-1MN770
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 “H” Controls are:
S15H Inverter
S17H Vector (Encoderless)
S18H Vector
S19H
DC SCR
S20H DC SCR (Line Regenerative)
S21H Inverter (Line Regenerative)
S22H Vector (Line Regenerative)
These Baldor Series “H” 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
“Auto-Tune” 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
(for elevators) 0 RPM to Base Speed 10% of Base Speed
to Base Speed. 0 RPM to Base Speed
Relative constant torque speed
range Wide
20:1 Narrow
5:1 - 10:1 Widest
Base Speed:1
Speed Control Yes Yes Yes
Torque Control Yes No Yes
PositioningYes
(Encoder or resolver feedback) No Yes
Speed regulation: Open Loop
Closed Loop ± 1 - 2% of base speed
± 1% of set speed ± 3% of base speed
± 1% of set speed ± 0.5 to 1% of set speed
± 0.05% of set speed
Continuous full rated torque at
zero speed No No Ye s
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.