Function Explanation; Indexer Mode (Idx) - Mitsubishi Electric MR-JE-*C Instruction Manual

8. HOW TO USE INDEXER
No. Start-up sequence
5 Gain adjustment Rotation ripples (speed
fluctuations) are large
at low speed.
Large load inertia
moment causes the
servo motor shaft to
oscillate side to side.
Note. Refer to "MELSERVO-JE Servo Amplifier Instruction Manual (Troubleshooting)" for details of alarms and warnings.

8.2 Function explanation

8.2.1 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].
Fault
Make gain adjustment in the
following procedure.
1. Increase the auto tuning
response level.
2. Repeat acceleration and
deceleration several times to
complete auto tuning.
If the servo motor can be run
safely, repeat acceleration and
deceleration three times or more
to complete auto tuning.
POINT
When the same next station No. is specified as station No. of the current
position, and the 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 the Torque limit value2 (2D6Bh) is automatically enabled
depending on the operation status. As the initial value of the Torque limit value 2
(2D6Bh) is 0.0%, when using the indexer operation, change the Torque limit
value 2 (2D6Bh) from the initial value. If the value remains unchanged, the servo
motor coasts.
Station No. 253
Station No. 254
Investigation
Gain adjustment fault
Gain adjustment fault
8 - 4
Possible cause Reference
MR-JE-_C
Chapter 6
MR-JE-_C
Chapter 6