Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

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13. USING A LINEAR SERVO MOTOR
13 - 1
13. USING A LINEAR SERVO MOTOR
WARNING
When using the linear servo motor, read the following descriptions in the SSCNET
Interface Linear Servo MR-J3- B-RJ004 INSTRUCTION MANUAL
(SH(NA)030054).
Safety Instructions
Handling of Linear Servo Motor
2. LINEAR SERVO MOTOR
9. CHARACTERISTICS
13.1 Functions and configuration
13.1.1 Summary
In fields of semiconductor and liquid crystal related equipment, installed machine, etc. with strong demands for
high accuracy, high-speed and high efficiency, the system using the linear servo motor for drive shaft is
increasing. Since the linear servo system can obtain the characteristics of the high-speed and the high
acceleration/deceleration greater than the ball screw drive system, and does not have a ball screw wear which is
a weak point in the ball screw drive system, it can extend the life of the equipments. In addition, a response error
does not occur and so the high accuracy system can be established.
The following shows the differences between the linear servo motor and the rotating servo motor.
Differences
Classification Item
Linear servo motor Rotating servo motor
Remarks
External I/O signal Stroke limit input signal
(FLS, RLS)
Required (when
magnetic pole is
detected) Not required Automatically turns ON in the
parameter setting.
Motor pole
adjustment Magnetic pole detection
operation Required Not required (adjusted
at shipment) Automatically executed at the first
servo-on after turning the power on.
For the absolute position linear
encoder, the magnetic polarity
detection can be made invalid in
the setting of parameter No.PS01.
(Refer to section 13.5.2 (2)(a).)
Home position
return Home position reference
position 1048576 pluses unit
(factory setting) Servo motor 1 rotation
unit The home position pitch can be
changed in the parameter settings.
(Refer to section 13.5.2.)
Absolute position
detection system Battery for absolute position
encoder
(MR-J3BAT) Not required Required The following alarm/warning is not
detected.
Absolute position erase (25.1)
Battery cable disconnection
warning (92.1)
Battery warning (9F.1)
Absolute position counter
warning (E3. )