Emerson EZMotion User Manual page 239

Velocity Loop Bandwidth
VelocityLoopBandwidth
The Velocity Loop Bandwidth parameter is the theoretical bandwidth of the velocity controller (how fast the system can
respond to change in velocity command). The value of this parameter depends heavily on the correct values for the motor
data, particularly the Motor Rotor Inertia and the Motor Current Constant (Ke). Units for this parameter are Hz.
Time Scale
VelocityUnits.TimeScale
Velocity time scale can be set to user units per second or user units per minute, used for all real-time velocities throughout the
PowerTools Pro software.
Acceleration
VirtualMaster.Accel
This parameter is the acceleration rate, in user units, that the virtual master will use to accelerate. This parameter is used
when in either jog or indexing mode.
Deceleration
VirtualMaster.Decel
This parameter is the deceleration rate, in user units, that the virtual master will use to decelerate. This parameter is used
when in either jog or indexing mode.
Scaling
VirtualMaster.CharacteristicDistance
The denominator (bottom value of the scaling fraction) is the VirtualMaster.CharacteristicDistance and is used with
VirtualMaster.CharacteristicLength to create the virtual master conversion ratio. Converting the user units distance into virtual
counts.
Scaling
VirtualMaster.CharacteristicLength
The numerator (top value of the scaling fraction) is the VirtualMaster.CharacteristicLength and is used with
VirtualMaster.CharacteristicDistance to create the virtual master conversion ratio scaling. Converting the user units distance
into virtual counts.
Scaling = Virtual MasterCharacteristicLength / VirtualMaster.CharacteristicDistance
Counts
VirtualMaster.Counts
This read only parameter is the number of virtual counts transmitted. It is zeroed on power up only.
Distance
VirtualMaster.Dist
This parameter is the incremental distance virtual master will move, in user units, if the virtual master is initiated as an index.
FeedRate Decel/Accel
VituralMasterFeedRateDecelerationTime
This parameter specifies the ramp used when velocity changes due to a change in the FeedRate Override value. The units of
FeedRate Decel/Accel are seconds/100%. Therefore, the user must specify the amount of time (in seconds) to accelerate or
decelerate 100% of programmed feedrate.
FeedRate Override
VirtualMaster.FeedRateOverride
This parameter is used to scale the Virtual Master counts. It can be described as "scaling in real time". The default setting of
100% will allow all counts to occur in real time. A seeing of 50% will scale time so that all counts are half as fast as they are at
100%. A setting of 200% will scale time so that all count run twice as fast as they would at 100%. Feed Rate Override is
always active, and this parameter may be modified via Modbus, Ethernet, or in a program.
Position Counts
VirtualMaster.PosnCmdInCounts
This parameter is the number of virtual counts transmitted. Write to this parameter to zero it's value. It is only used as a user
EZMotion User/Programming Guide
Revision A8 www.controltechniques.com
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