Mitsubishi Electronics MR-J2S- CL User Manual

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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.