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4. OPERATION
4.5 Absolute position detection system
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-BAT or A6BAT
Maximum revolution range Home position 32767 rev.
(Note 1)
Maximum speed at power failure 500r/min
(Note 2)
Battery backup time Approx. 10,000 hours (battery life with power off)
(Note 3)
Data holding time during battery
replacement
2 hours at delivery, 1 hour in 5 years after delivery
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. Period during which data can be held by the super capacitor in the encoder after power-off, with the battery voltage low or
the battery removed, or during which data can be held with the encoder cable disconnected.
Battery replacement should be finished within this period.
(3) Structure
Component Description
Servo amplifier
Servo motor
Use standard models.
Battery MR-BAT or A6BAT
Encoder cable
Use a standard model.
When fabricating, refer to (2), Section 14.1.4.