Automatic Operation Mode - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

6. HOW TO USE INDEXER

6.2 Automatic operation mode

6.2.1 Automatic operation mode
(1) Logic of indexer
The positioning is executed like this. A station, which one of the divided circumference (360 degrees)
into 255 at most on the machine side, is selected by using 8-bit devices of the DI0 (Next station No.
selection 1) to DI7 (Next station No. selection 8). The following diagram is an example for when [Pr.
PA14] is set to "0".
The station No. 0 is set as a home position. The number of divisions is set with [Pr. PT28].
(2) Rotation direction
There are two operation methods: Rotation direction specifying indexer, which always rotates in a fixed
direction and execute positioning to a station; Shortest rotating indexer, which automatically changes a
rotation direction to the shortest distance and execute positioning to a station
Rotation direction specifying indexer
POINT
There are the following conditions between the number of gear teeth on
machine side ([Pr. PA06 Number of gear teeth on machine side]) and servo
motor speed (N).
When CMX ≤ 2000, N < 3076.7 r/min
When CMX > 2000, N < 3276.7 - CMX r/min
When the servo motor is operated at servo motor speed higher than the limit
value, [AL. E3 Absolute position counter warning] occurs.
When the same next station No. is specified as station No. of the current
position and a positioning operation is executed, the motor does not start
because the travel distance is decided as "0".
CW direction
Station No. 2
Station No. 1
Station No. 0
6 - 7
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Station No. 253
Station No. 254
Shortest rotating indexer