Baldor 18H Series, Инструкция по установке и эксплуатации

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Section 2
General Information
General Information 2-1 MN718
Overview
The Baldor Series 18H PWM control uses flux vector technology. Flux vector technology
(sometimes referred to as Field Oriented Control) is a closed loop control scheme using
an algorithm to adjust 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 to the
motors’ shaft.
The control’s rated horsepower is based on the use of a NEMA design B four pole motor
and 60Hz operation at nominal rated input voltage. If any other type of motor is used, the
control should be sized to the motor using the rated current stated on the motor
nameplate.
The Baldor Series 18H control may be used in many different applications. It may be
programmed by the user to operate in four different operating zones; standard or quiet
constant torque or variable torque. 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 Section 4 of this manual.