Katalog Ezi-Servo Plus R.PDF

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0904Servo Plus-R.qxd
Closed Loop Stepping System
with Network based Motion Controller
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2
Position Table Function
Position Table is used for motion control by digital input and
output signals of host controller.
You can operate the motor directly by sending the position table
number, start/stop , origin search
and other digital input values
from a PLC.
The PLC can monitoring the
inposition, origin search,
moving/stop, servo ready
and other digital output
signals from a drive.
A maximum of 256
positioning points
can be set from PLC.
3
Closed Loop System
The Ezi-SERVO Plus is an innovative closed loop stepping motor
controller that utilizes a high-resolution encoder to constantly
monitor the current motor shaft position. With the encoder feed-
back feature, the Ezi-SERVO Plus keeps updating the current
position information every 25 micro seconds. If necessary, the Ezi-
SERVO Plus takes a corrective action to compensate the loss of
synchronization, for example, due to a sudden load change,
eliminating missing step error, which is a typical drawback with
stepping motors.
1
Network based Motion Control
A maximum of 16 axes can be operated from a PC through RS-
485 communication. All of the Motion conditions are set through
network and saved Flash ROM as a parameter.
Motion Library (DLL) is provided for programming under Windows
2000 / XP.
4
No Gain Tuning
In order to improve a control performance, tuning the gains of a
servo system is the most crucial step. Depending on the source of
a load change, this is a long, tedious, troublesome, and time-
consuming job for an application field engineer. The Ezi-SERVO
Plus fully employs the unique characteristics of the closed
loop stepping motor control, eliminating these
cumbersome steps and giving the engineer
a similar satisfaction with a high perf-
ormance servo system. Especially,
Ezi-SERVO Plus is well suited for
low stiffness loads (for example,
a belt and pulley system)
that are common problems
experienced in a most
servo system, while still
maintaining the best
performance
in all situations.
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5
No Hunting
8
High Resolution
Contrary to a traditional servo motor drive, there is no problem of
hunting in the Ezi-SERVO Plus that utilizes the unique feature of
stepping motors. After reaching a desired target position, Ezi-
SERVO Plus does not experience a fluctuation in motion. This
feature is especially useful in an application such as vision
systems in which vibration could be a problem.
The unit of the position command can be divided precisly.
(max. 32,000 pulses/revolution)
9
High Torque
6 Smooth and Accurate
Compared with common step motors, Ezi-SERVO Plus can
maintain a high torque state over relatively long period of time. It
is possible for the driver to continuously operate without loss of
synchronism under 100% of the load, there is no need to concern
the load-tolerance, opposing to conventional microstep drives.
Ezi-SERVO Plus exploits high-torque in high-speed regime owing
to the innovative optimum current phase control in accordance
with rotational speeds.
Ezi-SERVO Plus is a high-precision servo drive, using a high-
resolution encoder with 10,000 pulses/revolution.
Unlike a conventional microstep drive, the on-board high
performance DSP
(Digital Signal
Processor) performs
a vector control and
filtering,producing
a smooth rotational
control with
minimum ripples.
7 Fast Response
Similar to conventional stepping motors, Ezi-SERVO Plus shows
good synchronization with commanding pulses and realizes a
short and fast response in a positioning action. Thus, it is a great
feature of Ezi-SERVO Plus when rapid motions with a short
distance are required. For the case of traditional servo motor
systems, there is a considerable delay between the commanding
input signals and the resultant motion because of the constant
monitor of the current position, necessitating a waiting time until it
settles, called settling time.
10
High Speed
The Ezi-SERVO Plus functions well at high speed without the loss
of synchronism.The ability of continuous monitoring of current
positions enables a stepping motor to generate high-torque, even
under a 100% load condition.
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Features of Motion Controller
1. Loop Count
This function allows positioning repeatedly
according to the loop count number.
2. Acceleration / Deceleration
For quick acceleration and gradual deceleration, you
can set each non symmetry acceleration and
deceleration time seperately.
3. Pause
You can pause the motion upon the input of an
external signal. When Pause signal change to
OFF, the motor restart to original target position.
4. Continuous Motion
With this function, motions 1 and 2 are executed
without stopping between each one.
5. Teaching
Teaching signal is used to memorizing current
position data into the selected position table
item.
6. Alarm
The number of LED flashing time is indicate
which alarm has occurred.
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