Indexer Mode (Idx) - Mitsubishi Electric MR-J4-_GF Instruction Manual

6. SERVO MOTOR DRIVING

6.3 Indexer mode (idx)

6.3.1 Indexer mode (idx)
(1) Logic of indexer
The circumference of the load side (360 degrees) can be divided into a maximum of 255 stations.
Positioning is executed to a station selected with "Target point table". The following diagram is an
example for when [Pr. PA14] is set to "0".
CW direction
Station No. 2
Station No. 1
Station No. 0
The station No. 0 is set as a home position. Set the number of stations with [Pr. PT28].
POINT
In the absolute position detection system, rotating the shaft one revolution or
more during power-off may erase the home position. Therefore, do not rotate the
shaft one revolution or more during power-off. When the home position is
erased, [AL. 90 Home position return incomplete warning] will occur. In that
case, execute the home position return again.
The indexer method cannot be used in the fully closed loop system and linear
servo system. The combination of the indexer method and fully closed loop
system/linear servo system triggers [AL. 37 Parameter error].
There are the following restrictions on [Pr. PA06 Number of gear teeth on
machine side] and the servo motor speed (N).
When CMX ≤ 2000, N < 3076.7 r/min
When CMX > 2000, N < (3276.7 - CMX)/10 r/min
When the servo motor is operated at a servo motor speed higher than the limit
value, [AL. E3 Absolute position counter warning] will occur.
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 determined as "0".
In the indexer method, "Touch probe function" is disabled.
In the indexer method, "Position actual value", "Touch probe status", "Touch
probe pos1 pos value", "Touch probe pos1 neg value", "Touch probe pos2 pos
value" and "Touch probe pos2 neg value" will be always 0.
The setting value of [Pr. PC77 Internal torque limit 2] is automatically enabled
depending on the operation status. The initial value of [Pr. PC77] is 0.0%. When
you use indexer operation, change the value. If the value remains unchanged,
the servo motor coasts.
Station No. 253
Station No. 254
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