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5. STARTUP
5.8 Absolute position detection system
CAUTION
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
System
Battery
Maximum revolution range
(Note 1) Maximum speed at power failure
(Note 2) Battery backup time
Battery storage period
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
Servo amplifier
Servo motor
Battery
Encoder cable
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.
Item
Component
Electronic battery backup system
1 piece of lithium battery ( primary battery, nominal
Type: MR-J3BAT
Home position
32767 rev.
3000r/min
Approx. 10,000 hours (battery life with power off)
5 years from date of manufacture
Use standard models.
MR-J3BAT
Use a standard model. (Refer to section 14.1)
5 - 55
Description
Description
3.6V)
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