Mitsubishi Electronics QD75P Absolute position restoration function, QD75 Operation Panel Module

12 CONTROL SUB FUNCTIONS

12.6 Absolute position restoration function

MELSEC-Q

!CAUTION

When the absolute position restoration is carried out, the servo ON signal may be turned OFF (servo OFF) for about 20 ms, and the motor may operate. If this is not desired, install an electromagnetic brake separately and lock the motor by that brake during the absolute position restoration.

The "absolute position restoration function" is a function to restore the absolute position of the designated axis by the absolute position detection system. By this function, the OPR after power OFF such as instantaneous power interruption and emergency stop is not required, and the restoration operation at site can be carried out easily.

The details of the "absolute position restoration function" are described below.

[1]Configuration and preparation of absolute position detection system

[2]Outline of absolute position detection data communication

[3]Absolute position signal transmission procedure

[4]Precautions during control

[1]Configuration and preparation of absolute position detection system

(1)Configuration

The following drawing shows the configuration of the absolute position detection system.

1)Absolute position holding battery

Power Servo

supply amplifier

3)

Detector cable Control signal connector

2)

Servomotor with absolute position detector

PLC system

QCPU

QD75

Operation

panel

4)

I/O

module

Fig. 12.32 Configuration of absolute position detection system

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