Rockwell Automation 20D PowerFlex 700S Drive Ph I Control, Frames 1...11 - Manual (Page 212)

C-2 Application Notes
Example:
Calculate the maximum power of a 5 HP, 460V motor connected to a 480V
rated drive supplied with 342V Actual Line Voltage input.
• Actual Line Voltage / Nominal Motor Voltage = 74.3%
• 74.3% × 5 HP = 3.7 HP
• 74.3% × 60 Hz = 44.6 Hz
At 342V Actual Line Voltage, the maximum power the 5 HP, 460V motor
can produce is 3.7 HP at 44.6 Hz.
Motor Control Mode Parameter 485 [Motor Ctrl Mode] selects the type of motor control to use.
This parameter is set during the HIM assisted startup when asked to select
the Motor Control. The settings for Parameter 485 [Motor Ctrl Mode] are
• 0 - "FOC" selects field oriented control. Field oriented control is used
with AC squirrel cage induction motors for high performance.
• 1 - "FOC2" selects field oriented control and is only used for a specific
type of AC induction motor with motor thermal feedback.
• 2 - "Pmag Motor" selects control for permanent magnet motors.
• 3 - "Reserved"
• 4 - "Test" puts the drive in a test mode to perform the direction test.
"Test" is automatically selected during the direction test portion of the
Start-Up routine and does not need to be set manually by the user.
Field Oriented Control, Permanent Magnet Motor Control, and Volts/Hertz
Control are described in further detail below.
Field Oriented Control
Field oriented control is used with AC squirrel cage induction motors for
high performance. Motor data and an autotune is required for correct
operation in this mode. Field oriented control is selected by setting
parameter 485 [Motor Ctrl Mode] = 0 "FOC".
In field oriented control, the drive takes the speed reference that is specified
by the Speed Reference Selection Block and compares it to the speed
feedback. The speed regulator uses Proportional and Integral gains to adjust
the torque reference for the motor. This torque reference attempts to operate
the motor at the specified speed. The torque reference is then converted to
the torque producing component of the motor current.
5 HP
3.7 HP
HP
@ Motor (Drive Output)
Actual Line Voltage (Drive Input)
342V
460V
No Drive
Output
480V
528V