Technical information

120
230V FX Series Positioning Drive Reference Manual
Rotary + and Rotary - Indexes
Rotary + and - Indexes provide forced directional control of moves to absolute positions. All
other parameters function the same as they do with absolute indexes. An Absolute Index is a
direct move to a specific position, regardless of the starting point. A Rotary + Index moves to
the specified position, but only in a + direction.
If you wish to use Rotary + or - Indexes, you must set the Absolute Rotary Position Limits
parameter in the Limits screen to a user unit amount equal to one revolution of the motor or
the actuator (see “Limits” for more information.)
1. In the following examples the term “D” = (absolute position specified)-(current position).
If “D” is negative, - motion is implied.
2. In the following examples the “Absolute Rotary Position Limit” is set to 360.00°. This
means that with each revolution of the motor (or rotary table), the position displayed at the
bottom of the PCX screen will count up to 359.99°, then roll over to Ø°.
Rotary Indexes With A 360° Rotary Range Defined
1. If “D” is the correct sign for the rotary move (e.g., positive for a Rotary +), the drive will
allow multiple revolutions of the rotary range. This means that the motor will travel the
distance “D”.
Example 1: If the starting position is at Ø° and 720° is the specified position, a Rotary + Index
would travel 2 revolutions in the + direction. At the completion of this index the motor
position would be Ø°.
Example 2: If the starting position is at 60° and 360° is the specified position, a Rotary +
Index would travel 300° in the + direction. At the completion of this index the motor position
would be Ø°.
2. If “D” is the opposite sign of the rotary move, the motor will move to the same rotary
position but not allow the reverse motion.
Example 3: If the starting position is at 90° and 80° is the specified position, a Rotary + Index
would travel 350° in the + direction. At the completion of this index the motor position would
be 80°.
Example 4: If the starting position is at 90° and -730° is the specified position, a Rotary +
Index would travel 260° in the + direction. At the completion of this index the motor position
would be 350°.
Absolute Indexes With A 360 Rotary Position Limit Defined
1. Example 1: If the starting position is at Ø° and 359° is the specified position, an Absolute
Index would travel 1° in the - direction. At the completion of this index the motor
position would be 359°.
Example 2: If the starting position is at 90° and 271° is the specified position, an Absolute
Index would travel 179° in the - direction. At the completion of this index the motor
position would be 271°.