User guide

70 www.controltechniques.com SM-EZMotion Module User Guide
editing.
If the user wishes to control the Analog Output through
other means within the Unidrive SP, it is necessary to clear
the Enable Channel checkbox.
Source
The user can create a direct connection from a Source
parameter to the Analog Output. This means that the
current value of the parameter selected as the Source will
directly determine the value of the Analog Output signal.
The Source list box contains a list of predefined
parameters to select from. The list is as follows:
Following Error
If the user selects Following Error from the list of
predefined parameters, the SM-EZMotion module will
constantly write the present value of the parameter
FollowingError to the Analog Output. Following Error is
defined as the difference between position command and
the position feedback. Selecting Following Error from the
list will automatically configure the scaling parameters to
the correct units and default values. The units for
FollowingError are User Distance Units.
User Defined Module Variable
If the user selects User Defined Module Variable from the
list, then a text box titled Module Variable will appear where
the user can enter any desired parameter from within the
SM-EZMotion module to control the Analog Output. For a
list of available parameters, the user can access the Drag
In Variables window from within the Program # view. Once
the user enters a Module Variable, the units and resolution
will change accordingly.
User Defined SP Menu
If the user selects User Defined SP Menu from the list, then
a text box titled Menu will appear and the user can enter
any desired parameter from within the Unidrive SP to
control the Analog Output. For a list of available
parameters, refer to the Unidrive SP Advanced User
Guide.
Selecting User Defined SP Menu from the list will also
cause the Max and Min Value/Output parameters to
disappear because the scaling capabilities of the drive
parameters are minimized.
Velocity Command
If the user selects Velocity Command from the list of
predefined parameters, the SM-EZMotion module will
constantly write the present value of the parameter
VelCommand to the Analog Output. Velocity Command is
defined as the velocity commanded by the SM-EZMotion
module to the Unidrive SP, and is completely independent
of feedback. Selecting Velocity Command from the list will
automatically configure the scaling parameters to the
correct units and default values. The units for
VelCommand are User Distance Units/Unit Time.
Velocity Feedback
If the user selects Velocity Feedback from the list of
predefined parameters, the SM-EZMotion module will
constantly write the present value of the parameter
VelFeedback to the Analog Output. Velocity Feedback is
defined as the velocity measured by the feedback device
(i.e. encoder, resolver, etc.). Selecting Velocity Feedback
from the list will automatically configure the scaling
parameters to the correct units and default values. The
units for VelFeedback are User Distance Units/Unit Time.
Fast Mode Parameters
When selecting any of the following four parameters from
the Source list, the Unidrive SP has the ability to operate in
a “Fast Mode” where the drive updates the Analog Output
value every 250 microseconds instead of the normal
minimum of 4 milliseconds. In order to get the faster
update, the user must also select High Speed from the
Output Mode list box.
Menu 3.02 (Speed)
Selecting this Source will write the Unidrive SP Speed
Feedback to the Analog Output directly. The units for this
selection are always RPM regardless of the User Unit
configuration in the SM-EZMotion module.
Menu 4.02 (Active Current)
Selecting this Source will write the Unidrive SP Active
Current to the Analog Output directly. The Active Current is
the torque producing current being created by the drive.
The units for this selection are Amps.
Menu 4.17 (Magnetizing Current)
Selecting this Source will write the Unidrive SP
Magnetizing Current to the Analog Output directly. The
Magnetizing Current is the current produced to generate
the magnetic field or flux for an induction motor. The units
for this selection are Amps.
Menu 5.03 (Output Power)
Selecting this Source will write the Unidrive SP Output
Power to the Analog Output directly. The Output Power is
the product of the Output Voltage and the Active Current.
The units for this selection are kW.
Module Variable
The Module Variable parameter is only available once the
user has selected User Defined Module Variable from the
Source list box. The field is used to define what
SM-EZMotion module parameter will control the Analog
Output. This means that the selected module parameter
will directly determine the value of the Analog Output
based on the Max and Min scaling values entered on this
view.
Menu
The Menu parameter is only available once the user has
selected User Defined SP Menu from the Source list box.
In this text box, the user enters the desired Unidrive SP