136Absolute SystemOverview of Absolute SystemIn a motor of the absolute encoder specifications or absolute/incremental specifications, an absolute systemcan 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 notrequired after turning the power supply on.Configuration of Absolute SystemThe data of an absolute encoder consists of single-turn data, which output an absolute position alwayswithin single turn, and multi-turn data which counts the number of turns. When a battery for the absoluteencoder is connected, the multi-turn data can be held even if the power supply turns off. This allow to hold ahome position set once, even after thepower supply is reset. For the home po-sition setting, “Setup (Initialization) of Ab-solute Encoder” on page 138.Single-turn dataCW CCW– 1 0 0 1 1 2131071, 0,1,2 ............ 131071, 0,1,2 131071, 0,1,Multi-turn dataMotor rotating directionBattery (for Backup) InstallationFirst Installation of the BatteryAfter installing and connecting the back-up battery to the motor, execute an absolute encoder setup. Referto 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 BatteryIt 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 youreplace 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".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 BatteryCN601 Pull out after 5 min. connection Raise the latch and take off the cover. 1) Refresh the new battery. Connector with lead wire ofthe battery to CN601 andleave of 5 min. Pull out theconnector from CN601 5 minafter.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.
