Technical information

122
230V FX Series Positioning Drive Reference Manual
Accel Time
This parameter specifies the time in which the FX Drive will accelerate from zero speed to
maximum velocity during the index. The acceleration time actually used is found using the
following formula:
Actual Accel Time (AT2)=(AT1)(IV/MDV)
Where:
MDV = Maximum Drive Velocity.
AT1 = Acceleration Time from zero to MDV (Value you entered).
AT2 = Actual Acceleration Time.
IV = Index Velocity (in user units) you entered for this index.
For example, if you are setting up an FX-455 with a DXE-455 motor, the motor’s maximum
velocity is 3,000 RPM. In the index screen you enter a maximum velocity of 1,200 RPM and
an acceleration time of 1 second. The actual time the FX drive will take to accelerate the
motor from zero to 1,200 RPM is found by multiplying 1 second by 1,200/3,000, or 0.4
seconds to reach 1,200 RPM.
Decel Time
This parameter is the direct opposite of acceleration time. The value you enter here is the time
in seconds you want the FX drive to use to decelerate from maximum motor velocity to zero
speed. This rate is then used to go from Index Velocity to zero speed when the index is
complete. The calculation is:
Actual Decel Time (DT2)=(DT1)(IV/MDV)
Where:
MDV = Maximum Drive Velocity.
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.
For example, if you are setting up an FX-316 with a DXE-316 motor, the motors maximum
velocity is 4,000 RPM. In the index screen you enter a maximum velocity of 1,800 RPM and
a decel time of 2.0 seconds. The actual time the FX drive will take to decelerate the motor
from 1,800 RPM to zero is found by multiplying 2.0 seconds by 1,800/4,000 or 0.9 seconds.
Dwell Time
The value entered here is the amount of time the FX drive will wait at the end of the
commanded index distance at zero velocity before the index is considered complete. The End
Of Index output (output function number 4) comes on when the index motion is complete and
remains on for the duration of the non-zero entry in Dwell Time.