Mitsubishi Electronics QD75D, QD75P user manual Rate Pulse Rate, PG0 Pulse Generator Zero

APPENDICES

MELSEC-Q

OPR REQUEST

This signal turns ON when there is an error with the QD75. It will turn ON in the following situations.

1)When the power is turned ON.

2)When the PLC READY signal turns from OFF to ON.

3)When the machine OPR starts.

4)When the drive unit READY signal turns from ON to OFF.

The user judges whether to carry out a machine OPR in the above situations.

P RATE (Pulse Rate)

A coefficient that magnifies the feedback pulses per motor shaft rotation by 2-fold, 3- fold, 1/2 or 1/3.

It is the ratio of the feed pulses and feedback pulses.

For example, when the No. of pulses per motor shaft rotation is set to 2400 pulses, and the P rate is set to 2, the result will be equivalent to 1200 pulses.

The rotation per pulse is 0.15° when 2400 pulses per rotation are set, but this becomes 0.3° when 1200 pulses. The positioning accuracy drops as the P rate is increased.

OUTPUT TERMINAL

This is a pin connector for outputting data from the QD75 to an external source. It is connected to the motor drive unit.

This terminal is used to output the following.

•Feedback pulses for both forward run and reverse run

•Start

•Deviation counter clear

The terminal Nos. are determined for each axis.

The output No. Yn is not directly related to the program, so it is not used.

OVERRIDE FUNCTION

With this function, the speed during positioning operations (current speed) can be varied between 1 and 300%.

The speed can also be changed by the same variable rate for continuous positioning with differing designated speeds.

PARAMETER

This is the basic data used in positioning. Parameters are determined by the machine side design, so subsequent changes of parameters must be accompanied by changes in the machine design.

Data cannot be written during positioning. The initial parameter values are written by the maker.

PG0 (Pulse Generator Zero)

Pronounced "pee-jee-zero". Refer to the term "ZERO SIGNAL".

Feedback pulses

PG0 1 axis rotation

Appendix - 83