Emerson PACMotion VFD Series - Motor Control Parameters; Parameter Group 4 Overview and Methods

GFK-3111A PACMotion VFD AC Variable Speed Drive User Guide 63
Parameter Group 4 – High Performance Motor Control
Overview
Parameters relating to the motor control are located together in Group 4. These parameters allow the user to:
• Select the motor type to match the connected motor.
• Carry out an autotune.
• Dene the torque limits and setpoint source for control methods that support this (vector control
methods only).
PACMotion VFD can operate with both Asynchronous Induction Motors, the type most commonly seen
today, and also some synchronous motors. The sections below provide basic guidance on how to adjust the
parameters to operate with the required motor type.
Asynchronous IM Motors
IM Motor Control Methods
IM Motors may be operated in the following modes:
• V/F Speed Control (Default Mode)
o This mode provides the simplest control, and is suitable for a wide range of applications.
• Sensorless Vector Torque Control
o This method is suitable for specic applications only, which require the motor torque to be the
primary control function, rather than speed, and should be used with extreme care only in specic
applications.
• Sensorless Vector Speed Control
o
This method provides increased starting torque compared to V/F mode, along with improved motor speed
regulation with changing load conditions. This method is suitable for more demanding applications.
Operating in Sensorless Vector Speed Control Mode
PACMotion VFD can be programmed by the user to operate in Sensorless Vector mode, which provides
enhanced low speed torque, optimum motor speed regulation regardless of load and accurate control of
the motor torque. In most applications, the default Voltage Vector control mode will provide adequate
performance, however if Sensorless Vector operation is required, use the following procedure.
• Ensure advanced parameter access is enabled by setting P1-14 = 101.
• Enter the motor nameplate details into the relevant parameters as follows:
o P1-07 Motor Rated Voltage
o P1-08 Motor Rated Current
o P1-09 Motor Rated Frequency
o (Optional) P1-10 Motor Rated Speed (Rpm)
o P4-05 Motor Power Factor.
• Select Sensorless Vector Speed Control mode by setting P4-01 = 0.
• Ensure that the motor is correctly connected to the drive.
• Carry out a motor data Autotune by setting P4-02 = 1.
WARNING
The Autotune will begin immediately when P4-02 is set regardless of the status of the drive enable signal.
Whilst the autotune procedure does not drive or spin the motor, the motor shaft may still turn slightly. It is
not normally necessary to uncouple the load from the motor; however the user should ensure that no risk
arises from the possible movement of the motor shaft.
WARNING
It is essential that the correct motor data is entered into the relevant drive parameters. Incorrect parameter
settings can result in poor or even dangerous performance.