Specifications

A - 45
ENCODER
This refers to an encoding device, such as a
pulse generator, that inputs the position
information into the control unit.
A
B
Z
Ball bearing
Input axis
Code disk
Photoreceptor
(phototransistor)
Index
scale
Light source
(light-emitting diode)
Rotary encoder
(Incremental)
Main signal slit
Zero point signal slit
a
a
b
z
b
Light source
(LED)
Collimator lens
Main scale
Photoreceptor
(photodiode)
Reference
zero point
Index
scale
Linear encoder
A binary output method, including the
incremental method and absolute method, is
used.
Refer to the term "ABSOLUTE ENCODER".
Refer to the term "INCREMENTAL
ENCODER".
ERROR COMPENSATION
If there is a dimension error in the machine,
and that error is larger or smaller than 1m
regardless of a 1m command being sent from
the unit, the motion controller will compensate
that error amount. For example, if the actual
feed amount is smaller than 1m, extra pulses
will be set to compensate the position to 1m.
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.
FEEDBACK PULSE
This is a pulse train returned to confirm that
the machine moved according to the
commands issued with 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".
FEED CAM
Feed operation, equivalent to the stroke
amount from the stroke lower limit position
(bottom dead position), is continuously carried
out, allowing conveyor feed and transfer
machine feed.
0
0
One cycle
Stroke amount
Dead center point
FEED FORWARD CONTROL
Used to reduce the motor delay and improve
the servo tracking performance in respect to
the position control command. (Invalid during
automatic tuning.)
Set in the range of 0 to 150%.