Emerson P/N 400361-00 manual DDF File Parameter

Motor Definition Section

The motor definitions section contains the names and parameters of one or more user defined motors. The order of the parameters in the motor definition must match the example in Figure 120.

The motor parameters do not define with which drive(s) the motor may be used. Therefore, any motor in the .ddf file may be used with any drive.

Abbreviated parameter identifiers are used in the .ddf file. The table below shows the abbreviated identifier for each parameter followed by a description of each.

DDF File Parameter	Parameter Description	Units
name	Motor name that appears in	N/A
	Motor Type list box
folder	Not currently used -	N/A
	future motor organization
peakCurrent	Motor Peak Current rating	Amps(rms)
continuousCurrent	Motor Continuous Current rating	Amps(rms)
motorPoles	Number of Motor Poles	N/A
rotorInertia	Motor Rotor Inertia	kg*m2
motorKE	Motor Electrical Time Constant	Vrms/kRPM
phaseResistance	Motor Stator Resistance	Ohms
phaseInductanceSP	Motor Stator Inductance	mH
maxOperatingSpeed	Motor Maximum Velocity	RPM
thermalTimeConstant	Motor Thermal Time Constant	Sec.
encoderPhaseAngle	Motor Encoder Phase Angle	Degrees

Motor ID

MotorID is used for each motor to mark the beginning of a new user defined motor definition. The format is [MotorXX] where XX is the number indicating placement in the motor list. The first motor in the list is always [Motor0]. For each motor added to the list, the Motor ID increments by one.

Name

The motor name is limited to 12 characters and must begin with an alpha character (non-numeric character). This is the motor name that will appear in the “Motor Type” list box on the Motor/Encoder view in PowerTools Pro EZ.

Folder

This parameter is not used in early releases of PowerTools Pro EZ. Eventually the user can place motors into a specified folder to make the motor list easier to sort through in PowerTools. A folder name is specified and may include subfolders separated by the “” character. More information on this parameter to be provided later. Initially, select from 200V or 400V values.

If a motor is automatically entered into the .ddf file by PowerTools Pro EZ when uploading or opening an existing file, this parameter will be set to “UploadedMotor”.

peakCurrent

Specifies the peak current allowed by the motor. The valid range is 0.00 to 9999.99 Amps (rms). The motor manufacturer typically provides the peak current data.

If a system is “drive limited” (meaning that the motor can handle more current than the drive can deliver), the peak current actually used by the system may be lower than the value specified here.

continuousCurrent

Specifies the continuous current allowed by the motor. It is used to determine the Unidrive SP continuous current and peak current limits. The drive can also limit the continuous current to the motor based on the drive capacity. The range is 0.00 to 9999.99 Amps (rms). The motor manufacturer typically provides the continuous current data.

If a system is ‘drive limited” (meaning that the motor can handle more current than the drive can deliver), the continuous current actually used by the system may be lower than the value specified here.

motorPoles

Specifies the number of magnetic poles on the motor. The supported values are 4 to 120. The motor manufacturer typically provides the motor pole information.

rotorInertia

This parameter specifies the inertia of the motor rotor. The range is 0.000010 to 90.000000 kg*m^2. The SM-EZMotion module uses this parameter to interpret the “Inertia Ratio” parameter found on the Tuning view. “Inertia Ratio” is specified as a ratio of reflected load inertia to motor inertia.

motorKE

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 1.0 to 5000.0. The motor manufacturer will typically provide the Ke data.

phaseResistance

Specifies the phase resistance of the motor. You can determine this value by measuring the resistance between any motor phase and ground with an ohm-meter. The range is 0.000 to 30.000 Ohms. The motor manufacturer will typically provide the phaseResistance data.

Note

This parameter is not the same as the phaseResistance parameter found in the .ddf file used for En/Epsilon/MDS drives. Do not copy this value from stdmotor.ddf.

phaseInductanceSP

Specifies the phase inductance of the motor. This is the inductance measured from phase to ground and NOT phase-to-phase. The range is 0.00 to 5000.00 mH.

126 www.emersonct.com SM-EZMotion Module User Guide