Emerson Epsilon Eb Series Reference Manual page 49

Epsilon Eb and E Series EN Drives Reference Manual
Where:
VCA = Velocity Command Analog (RPM)
AI = Analog Input (volts)
AZO = Analog Input Zero Offset (volts)
FSV = Full Scale Velocity (RPM)
AFS = Analog Input Full Scale (volts)
The Velocity Command is always equal to the Velocity Command Analog in Analog
Velocity mode. The Velocity Command is the command received by the velocity closed loop
control.
Analog Accel/Decel Limit
This feature in the Analog submode allows you to limit the accel and decel rate when using
the analog input for velocity control. This makes it very simple to use the drive in high
performance, variable speed, start-stop applications such as Clutch-Brake replacements
without requiring a sophisticated controller to control the acceleration ramps. In applications
which do not require the drive to limit the ramps such as when using an external position
controller, the parameter can be set to "0" (its default value). If the Analog Accel/Decel Limit
parameter value is changed during a ramp, the new ramp limit is imposed within the next
servo loop update.
The Analog Accel/Decel Limit parameter is accessed on the Velocity tab. Its range is 0.0 to
32700.0 ms/kRPM.
Presets Submode
Presets submode provides up to eight digital Velocity Presets and associated Accel/Decel
Presets. At any time only one Velocity Preset can be selected. They are selected using the
Velocity Preset Line #1, Line #2 and Line #3 input functions (see table below).
Velocity Preset Line #3
0
0
0
0
1
1
1
1
* (0) = Inactive input function, (1) = Active input function
When one of the Velocity Presets is selected, the Target Velocity is set equal to the Velocity
Preset value and the accel/decel ramp rate is set to the Accel/Decel value associated with that
velocity.
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Velocity Preset Line #2 Velocity Preset Line #1
0
0
1
1
0
0
1
1
Selected Velocity and Accel
/ Decel Preset #
0 0
1 1
0 2
1 3
0 4
1 5
0 6
1 7