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Absolute System
Overview of Absolute System
In a motor of the absolute encoder specifications or absolute/incremental specifications, an absolute system
can be constructed by connecting a battery for an absolute encoder and changing the setting of SV.Pr0B
(absolute encoder setting) from “1” (default setting) into “0” or “2”. In the absolute system, homing is not
required after turning the power supply on.
Configuration of Absolute System
The data of an absolute encoder consists of single-turn data, which output an absolute position always
within single turn, and multi-turn data which counts the number of turns. When a battery for the absolute
encoder is connected, the multi-turn data can be held even if the power supply turns off. This allow to hold a
home position set once, even after the
power supply is reset. For the home po-
sition setting, “Setup (Initialization) of Ab-
solute Encoder” on page 138.
Single-turn data
CW CCW
–1 0 0 1 1 2
131071, 0,1,2 ............ 131071, 0,1,2 131071, 0,1,
Multi-turn data
Motor rotating direction
Battery (for Backup) Installation
First Installation of the Battery
After installing and connecting the back-up battery to the motor, execute an absolute encoder setup. Refer
to P.138, "Setup (initialization) of Absolute Encoder ".
It is recommended to perform ON/OFF action once a day after installing the battery for refreshing the battery.
A battery error might occur due to voltage delay of the battery if you fail to carry out the battery refreshment.
Replacement of the Battery
It is necessary to replace the battery for absolute encoder when battery alarm occurs.
Replace while turning on the control power. Data stored in the encoder might be lost when you
replace the battery while the control power of the driver is off.
After replacing the battery, clear the battery alarm. Refer to P.99, "How to Clear the Battery Alarm".
<Caution>
When you execute the absolute encoder with the console (refer to P.100 of Setting), all of error and multi-
turn data will be cleared together with alarm, and you are required to execute “Setup (Initialization) of abso-
lute encoder” (refer to P.138).
How to Replace the Battery
CN601
Pull out after 5 min.
connection
Raise the latch and
take off the cover.
1) Refresh the new battery.
Connector with lead wire of
the battery to CN601 and
leave of 5 min. Pull out the
connector from CN601 5 min
after.
2) Take off the cover
of the battery box.
3) Install the battery to
the battery box.
Connect
the connector.
Place the battery with
+ facing downward.