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5. STARTUP
5.8 Absolute position detection system
CAUTION
If an absolute position erase alarm (A25) or an absolute position counter warning
(AE3) has occurred, always perform home position setting again. Not doing so can
cause runaway.
This servo amplifier contains a single-axis controller. Also, all servo motor encoders are compatible with an
absolute position system. Hence, an absolute position detection system can be configured up by merely
loading an absolute position data back-up battery and setting parameter values.
(1) Restrictions
An absolute position detection system cannot be built under the following conditions:
1) Stroke-less coordinate system, e.g. rotary shaft, infinite positioning.
2) Operation performed in incremental value command type positioning system.
(2) Specifications
Item Description
System
Electronic battery backup system
Battery
1 piece of lithium battery ( primary battery, nominal 3.6V)
Type: MR-J3BAT
Maximum revolution range
Home position 32767 rev.
(Note 1) Maximum speed at power failure
3000r/min
(Note 2) Battery backup time
Approx. 10,000 hours (battery life with power off)
Battery storage period
5 years from date of manufacture
Note 1. Maximum speed available when the shaft is rotated by external force at the time of power failure or the like.
2. Time to hold data by a battery with power off. It is recommended to replace the battery in three years
independently of whether power is kept on or off.
(3) Structure
Component Description
Servo amplifier
Servo motor
Use standard models.
Battery MR-J3BAT
Encoder cable
Use a standard model. (Refer to section 14.1)
Содержание MELSERVO MR-J3-xT
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