5.9 Absolute Encoders5-675 Operation Installing a Battery in the Host Controller1. Turn ON only the control power supply.2. Remove the old battery and mount the new battery.3. After replacing the battery, turn OFF the control power supply to clear the absolute encoder battery erroralarm (A.830).4. Turn ON the control power supply again.5. Check that the alarm display has been cleared and that the multi-winding drive unit, SERVOPACKs, andconverters operate normally.5.9.4 Absolute Encoder Setup and ReinitializationSetting up and reinitialization of the absolute encoder are necessary in the following cases.• When starting the machine for the first time• When an encoder backup error alarm (A.810) is generated• When an encoder checksum error alarm (A.820) is generated• When initializing the rotational serial data of the absolute encoderSet up the absolute encoder with Fn008.(1) Precautions on Setup and Reinitialization• The write prohibited setting parameter (Fn010) must be set to Write permitted (P.0000).• Set up or reinitialize the encoder when the servomotor power is OFF.• The encoder backup error alarm (A.810) and encoder checksum error alarm (A.820) cannot be canceledwith the multi-winding drive unit’s alarm reset (/ALM-RST) input signal. Always use Fn008 for the setup(initializing).• Encoder backup error alarm (A.810)• Encoder checksum error alarm (A.820)• Any other alarms (A.8) that monitor the inside of the encoder should be canceled by turning OFF thepower.CAUTION• The rotational data will be a value between -2 and +2 rotations when the absolute encoder setup is exe-cuted. The reference position of the machine system will change. Set the reference position of the hostcontroller to the position after setup.If the machine is started without adjusting the position of the host controller, unexpected operation maycause injury or damage to the machine. Take sufficient care when operating the machine.
