4 Operation4-344.5 Absolute EncodersIf using an absolute encoder, a system to detect the absolute position can be designed for use with the hostcontroller. As a result, an operation can be performed without a zero point return operation immediately afterthe power is turned ON.A battery case is required to save position data in the absolute encoder.The battery is attached to the battery case of the encoder cable.If an encoder cable with a battery case is not used, install a battery to the host controller.Set Pn002.2 to 0 (factory setting) to use the absolute encoder.A battery is not required when using the absolute encoder as an incremental encoder.PROHIBITED• Do not install batteries in both the host controller and battery case. It is dangerous because that sets up aloop circuit between the batteries.Parameter Meaning WhenEnabled ClassificationPn002n.0[Factory setting] Uses the absolute encoder as an absolute encoder. After restart Setupn.1 Uses the absolute encoder as an incremental encoder.The output range of the rotational serial data for the absolute position detecting systemused for Σ-V large-capacity servo drives is different from that of SGDB Σ servo drives. Asa result, the infinite-length positioning system of the Σ servo drives must be changed foruse with Σ-V large-capacity servo drives. Be sure to make the following system modifica-tions.∗ The action differs when the multiturn limit setting (Pn205) is changed. Refer to 4.5.6 MultiturnLimit Setting.SERVOPACKAbsoluteEncoderResolutionOutput Rangeof RotationalSerial DataAction when Limit Is ExceededΣ SeriesSGDB12-bit15-bit-99999 to+ 99999• When the upper limit (+99999) is exceededin the forward direction, the rotationalserial data will be 0.• When the lower limit (-99999) is exceededin the reverse direction, the rotational serialdata will be 0.Σ-II,Σ-V (large-capacity)SeriesSGDMSGDHSGDV17-bit20-bit-32768 to+ 32767• When the upper limit (+32767) is exceededin the forward direction, the rotationalserial data will be -32768.*• When the lower limit (-32768) is exceededin the reverse direction, the rotational serialdata will be +32767.*
