Mitsubishi A1SD75P1-S3, User Manual

Page: 590 / 622

Appendix - 43
MELSEC-A
APPENDICES
STOPPER STOP
This is one machine zero point return method.
With this method, a stopper is established at
the zero point, and the operation is stopped
when the machine presses against it.
Motor burning would occur or the stopper
would be damaged if the machine were left in
that state. There are two methods to prevent
this; a timer can be used to shut OFF the
motor after a fixed time, or the motor can be
stopped by limiting sudden increase in the
motor torque when the machine presses
against the stopper.
Machine zero point return
Zero point
Stopper
STROKE
The stroke is the variation in the operation by
the distance from a stopped state to the next
stopped state after a movement.
STROKE LIMIT
This is the range in which a positioning
operation is possible, or the range in which the
machine can be moved without damage
occurring.
(Movement outside this range is possible in
the manual operation.) For operations using a
worm gear, the stroke limit is determined by
the length of the screw. For operations using a
fixed-dimension feed, it is determined by the
max. dimension to be cut.
The upper and lower limits are set in the
parameters, but a separate limit switch should
be established and an emergency stop circuit
outside the PLC should be created. Refer to
the term "LIMIT SWITCH".
Lower limit
0 Upper limit
3m
Limit switch
for emergency
stop
Positioning possible in a 3m range
SUDDEN STOP
A stop carried out in a shorter time than the
deceleration time designated in the
parameters.
Full speed
Sudden stop
Time
Deceleration time
TEACHING
When the positioning address is uncertain, or
gauging is required, this function is used by
the user to search for and teach the position to
the machine.
For example, complex addresses such as
drawings can be taught by tracing a model,
and the positioning operation can be
reproduced.
TEACHING UNIT
This is a device capable of writing, reading,
running, and monitoring data.
It is used connected to the AD75. The model is
AD75TU.
TORQUE CONTROL
In this function, a limit is established for the
resistance torque applied to the motor. The
power is turned OFF if torque exceeding that
value is applied to the motor.
When excessive torque is applied to a motor, it
causes the current to suddenly increase. Motor
burning and other stress on the motor occurs,
and the life of the motor is shortened.
This function utilizes the sudden increase in
the torque when the machine returns to the
zero point to issue a command to stop the
motor.
TORQUE LOOP MODE
Also called the current loop mode.
Refer to "POSITIONING LOOP MODE".
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