APPENDICES

MELSEC-Q

SERVO LOCK

In positioning using a servomotor, stepping motor, etc., working power is required to hold the machine at the stop position.

(The position will be lost if the machine is moved by external power.)

This kind of state is called servo lock or servo lock torque.

SFC (Sequential Function Chart)

A sequential function chart is a programming method optimally structured for running a machine's automatic control in sequence with the PLC.

Start preparation

Start preparations OK

Positioning complete

Execution of advance operation servo program

Table

M

Motor holds the position at the stop position.

SERVO ON

The servo amplifier will not operate if the servo amplifier is in a normal state and this servo ON signal is OFF.

 

 

 

 

Execution of extrusion

Positioning complete

 

 

 

operation servo program

 

 

 

 

 

 

 

Execution of retract operation servo program

Positioning complete

SKIP FUNCTION

When a SKIP signal is input, the positioning being executed is interrupted, the motor is deceleration stopped, and the next positioning is automatically carried out.

QD75 READY Servo amplifier

SLAVE AXIS

During interpolation operation, the positioning

Servo ONdata is partially ignored on this side. This axis is moved by the master axis data.

Motor

 

PLG Encoder

 

SERVOMOTOR

A motor that rotates true to the command. Servomotors are highly responsive, and can carry out frequent high-speed and high- accuracy starts and stops.

DC and AC types are available, as well as large-capacity motors. A pulse generator accessory for speed detection is common, and feedback control is often carried out.

SETTING UNIT

This is one setting item of the positioning reference parameters. The unit to be used is designated as mm, inch, degree, or pulse.

Appendix - 87

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Mitsubishi Electronics QD75D, QD75P SFC Sequential Function Chart, Execution of extrusion, QD75 Ready Servo amplifier