Technical information

117
Software Setup and Operation
Figure 84: Velocity vs. Time Profile of an Incremental 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.
Incremental Indexes are used in applications where the distance traveled each time is critical
to the process. Some examples are auger fillers that must deliver carefully measured amounts
of material with each revolution of an auger screw, or conveyors that deliver product every
given distance of the conveyor.
Absolute Index
An Absolute Index will move the motor to a specific position, regardless of the starting
position. The drive will select the proper direction in order to arrive at the programmed
position.
Absolute Indexes are used in applications where the motor (or actuator) must travel to a
specific position, regardless of where the motor finds itself when an Absolute Index is
initiated.
VELOCITY
TIME
ACTUAL
ACCEL
TIME (AT2)
ACTUAL
DECEL
TIME (DT2)
DWELL
TIME
DISTANCE TRAVELLED
INDEX VELOCITY
DRIVE MAXIMUM VELOCITY
VELOCITY
PROGRAMMED
ACCEL TIME
(AT1)
PROGRAMMED
DECEL TIME
(DT1)
COMMANDED
POSITION