Mitsubishi Electric MR-JE-C, Instruction Manual

Page: 292 / 312

12. WHEN USING WITH A GENERAL-PURPOSE INTERFACE
12 - 77
(b) Rotation direction
There are two operation methods: Rotation direction specifying indexer, which always rotates in a
fixed direction and executes positioning to a station; Shortest rotating indexer, which automatically
changes a rotation direction to the shortest distance and executes positioning to a station.
Rotation direction specifying indexer Shortest rotating indexer
(2) Automatic operation mode 1 (rotation direction specifying indexer)
In this operation mode, the servo motor rotates in a fixed direction to execute positioning to a station.
The positioning is executed by selecting a station No. using 8-bit devices of the DI0 (Next station No.
selection 1) to DI7 (Next station No. selection 8). For the servo motor speed and
acceleration/deceleration time constant during operation, the values set in the point tables are used.
(a) Device/parameter
Set input devices and parameters as follows:
Item Device/parameter to be used Setting
Selecting indexer method Control mode selection of [Pr. PA01] Select "_ _ _ 8" (positioning mode (indexer method)).
Next station position DI0 (Next station No. selection 1) to DI7 (Next
station No. selection 8) Set any next station No. (Refer to (2) (c) in this
section.)
Selecting automatic operation
mode 1 (rotation direction
specifying indexer) MD0 (Operation mode selection 1) Switch off MD0.
MD1 (Operation mode selection 2) Switch on MD1.
Rotation direction selection SIG (External limit/Rotation direction decision/
Automatic speed selection) The rotation direction to a station No. will be as
follows.
Off: Station No. decreasing direction
On: Station No. increasing direction
Servo motor speed [Pr. PC05] Set a servo motor speed.
Acceleration time constant/
Deceleration time constant RT (Second acceleration/deceleration
selection) 1. When RT is turned off
Acceleration time constant: setting value of [Pr.
PC01 Acceleration time constant 1]
Deceleration time constant: setting value of [Pr.
PC02 Deceleration time constant 1]
2. When RT is turned on
Acceleration time constant: setting value of [Pr.
PC30 Acceleration time constant 2]
Deceleration time constant: setting value of [Pr.
PC31 Deceleration time constant 2]
Torque limit (Note) [Pr. PA11]
[Pr. PA12] Set a torque limit value in operation.
[Pr. PC35] Set a torque limit value in stop.
[Pr. PT39] Set a time period for switching from the torque limit
value in operation to that in stop.
Note. The torque limit will change from [Pr. PC35 Internal torque limit 2] to the setting value of [Pr. PA11 Forward rotation torque limit] or
[Pr. PA12 Reverse rotation torque limit] when ST1 (Forward rotation start) is inputted. After MEND (Travel completion) is
outputted, the time has passed set with [Pr. PT39] and the torque limit will change from [Pr. PA11 Forward rotation torque limit] or
[Pr. PA12 Reverse rotation torque limit] to the setting value of [Pr. PC35 Internal torque limit 2].