Emerson P/N 400518-02 manual Configuring the Drive

User Defined Motors

Motor Encoder U Angle

Specifies the electrical angle at which the rising edge of the U commutation track will occur with reference to VTS when the motor is spun in the encoder reference direction.

At power-up the drive looks at the status of the U, V and W commutation tracks and, using this parameter, obtains a crude (± 30 °) estimate of the electrical angle. See “Step 3: Determine Encoder Alignment” for a detailed procedure on how to determine this parameter.

Motor Encoder Reference Motion

Specifies the direction of motion assumed in phase plots of the encoder’s quadrature and summation signals. The supported values are CW(1) and CCW(0). Your encoder may have the same phase plot but is generated from a different direction of rotation. This parameter affects the way the drive interprets the quadrature and commutation signals.

Motor Inertia

This parameter specifies the inertia of the motor. The range is .00001 to .5 lb-in-sec2. The drive uses this parameter to interpret the “Inertia Ratio” parameter. “Inertia Ratio” is specified as a ratio of load to motor inertia.

Motor KE

Specifies the Ke of the motor. The units are VRMS/ kRPM. The line-to-line voltage will have this RMS value when the motor is rotated at 1000 RPM. The range is 5 to 500.

Motor Resistance

Specifies the phase-to-phase resistance of the motor. You can determine this value by measuring the resistance between any two motor stator terminals with an ohm meter. The range is .1 to 50 ohms.

Motor Inductance

Specifies the phase-to-phase inductance of the motor. The range is 1.0 to 100.0 mH.

Motor Peak Current

Specifies the peak current allowed by the motor. The range is 1 to 100 ARMS. If the peak current of the motor is greater than 30 ARMS, specify the peak as 30 ARMS. The drive will limit the peak current to the drive’s capacity.

Motor Continuous Current

Specifies the continuous current allowed by the motor. It is used to determine the current foldback point and the amount of current allowed during foldback. The drive can also limit the continuous current to the motor based on the drive capacity. This means that the operational “continuous current” may be different than the value specified here. The range is 1 to 100 ARMS.

Motor Maximum Operating Speed

Specifies the maximum operating speed of the motor. It is used by the drive to set the default motor overspeed trip point and to limit the Velocity Command. The Velocity Command is limited to 9/8ths (112.5 percent) of the Motor Maximum Operating Speed. If the actual velocity exceeds 150 percent of this value, the drive will fault on Overspeed. Typically this parameter is determined by the encoder bandwidth and/or other mechanical or electrical parameters of the motor. The maximum value is 11,000 RPM.

Step 6:Configuring the Drive

Once you have determined the motor parameters and entered them into the MOTOR.DDF file, you can configured the drive to the user defined motor using PowerTools Pro software. Once PowerTools Pro is started it will read the MOTOR.DDF file and you will be able to select the non-Control-Techniques motor.

131