Mitsubishi Electronics QD75P, QD75D QD75, F is a status where the module itself has a fault

APPENDICES

MELSEC-Q

ERROR CORRECTION

If a dimension error occurs in the machine, and that error is actually smaller or larger than 1m (3.28feet) in spite of a 1m (3.28feet) command being issued from the QD75, that error amount will be compensated. For example, when the error is actually smaller than 1m (3.28feet), the remaining distance to 1m (3.28feet) is fed, and the correct 1m (3.28feet) of positioning is carried out.

ERROR RESET

This resets error of axis. Note that if the cause of the error is not eliminated at that time, the error will occur again.

FAST OPR

The axis returns to the machine OP at the OPR speed without detecting the near-point dog.

(This is not validated unless a machine OPR has been carried out first.)

OPR speed

OP

Dog switch

EXTERNAL REGENERATIVE BRAKE RESISTOR

This is also called the regenerative brake. When a machine is moved with a motor, power is normally supplied to the motor from an amplifier. However, the rotation energy in the motor and machine counterflows (regenerates) to the amplifier when the motor is decelerating or when driving a descending load.

The external regenerative resistor consumes this regeneration energy with resistance, obtains the regenerative brake torque, and enables the full capacity of the regeneration system during stopping.

It is used when carrying out highly repetitive acceleration/deceleration.

FEED PULSE

This is a pulse issued from the positioning module to a servomotor or stepping motor. Also called a command pulse.

FEED SCREW

This is the basic screw in mechanisms that position using screw rotation. Ball screws are often used to reduce backlash and dimension error.

Positioning feed screw

1 rotation by the motor

Lead (feedrate per screw rotation)

F

In the QD75, F is a status where the module itself has a fault.

[HOLD]

FEEDBACK PULSE

This is a method of using a returning pulse train to confirm whether the machine faithfully operated according to the commands issued in automatic control. If the machine did not faithfully operate according to the commands, a correction command is issued. For example, if a command is issued for 10,000 pulses, and a feedback pulse of 10,000 pulses is returned, then the balance becomes 0 and it can be judged that the command was faithfully followed.

Refer to the term "DEVIATION COUNTER".

Appendix - 76