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Application Notes
PowerFlex 700S Phase II AC Drive User Manual -
Publication 20D-UM006G-EN-P – July 2008
Permanent Magnet Control
Permanent magnet control is used with permanent magnet motors.
Permanent magnet motor control is selected by setting parameter 485
[Motor Ctrl Mode] = 2 "Pmag Motor".
•
Permanent magnet motor control requires either a hi-resolution
Stegmann encoder or compatible resolver feedback on the motor. Refer
to
PowerFlex 700S Stegmann Hi-Resolution Encoder Feedback
for a list of compatible hi-resolution Stegmann
encoders and compatible resolvers.
•
Motor data and an autotune is required for correct operation in this
mode. Refer to
PowerFlex 700S Permanent Magnet Motor
for a list of compatible Allen-Bradley
permanent magnet motors and motor data to be used with the PowerFlex
700S.
Volts/Hertz Control - v2.003 and later
Volts/Hertz control is used in fan, pump, or multi-motor applications. Volts/
Hertz operation creates a fixed relationship between output voltage and
output frequency.
Configuration:
Volts/Hertz control is selected by setting parameter 485 [Motor Ctrl Mode]
= 3 "V/Hz".
Volts/Hertz allows a wide variety of patterns using linear segments. The
default configuration is a straight line from zero to rated voltage and
frequency. This is the same volts/hertz ratio that the motor would see if it
were started across the line. As seen in the diagram below, the volts/hertz
ratio can be changed to provide increased torque performance when
required. The shaping takes place by programming five distinct points on
the curve: