Technical information

118
230V FX Series Positioning Drive Reference Manual
Figure 85: Velocity vs. Time Profile of an Absolute Index
AT1=(AT2)(IV/MDV) DT1=(DT)(IV/MDV)
Where:
MDV = Maximum Drive Velocity.
AT1 = Acceleration Time from zero to MDV (Value you entered).
AT2 = Actual Acceleration Time.
DT1 = Deceleration Time from MDV to zero (Value you entered).
DT2 = Actual Deceleration Time.
IV = Index Velocity (in user units) you entered for this index.
An Absolute Index will cause the motor to go in the correct direction to the commanded
position.
For example, this index type allows you to command, a return to the zero point of the machine
without concern over where the motor is or which direction it must travel.
Feed Sensor Index
Feed Sensor and Registration Indexes combine moving to a sensor input point and a fixed
distance. The Feed Sensor index consists of two parts; the first part accelerates the motor to
the Index Velocity and continues at that velocity until it has moved the Index Distance, at
which time the motor will decelerate (or accelerate depending on the indexing profile) to the
Feed Velocity. During the second part of the index the FX drive will continue at the Feed
Velocity until it receives a sensor input, at which time it will decelerate the motor at the Feed
Deceleration Rate.
If the motor exceeds the Feed Sensor limit Distance before the FX drive receives a Feed
Sensor input, the motor will decelerate to zero.
VELOCITY
TIME
ACTUAL
ACCEL
TIME (AT2)
ACTUAL
DECEL
TIME (DT2)
DWELL
TIME
DISTANCE TRAVELLED
VELOCITY
PROGRAMMED
ACCEL TIME
(AT1)
PROGRAMMED
DECEL TIME
(DT1)
ABSOLUTE POSITION
INDEX VELOCITY
DRIVE MAXIMUM VELOCITY