Absolute Encoders - YASKAWA SGDV series User Manual

4 Operation
4.5

Absolute Encoders

If using an absolute encoder, a system to detect the absolute position can be designed for use with the host
controller. As a result, an operation can be performed without a zero point return operation immediately after
the 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.
• Do not install batteries in both the host controller and battery case. It is dangerous because that sets up a
loop circuit between the batteries.
Set Pn002.2 to 0 (factory setting) to use the absolute encoder.
Pn002
A battery is not required when using the absolute encoder as an incremental encoder.
4-34
Parameter
n. 0
Uses the absolute encoder as an absolute encoder.
[Factory setting]
n. 1
Uses the absolute encoder as an incremental encoder.
The output range of the rotational serial data for the absolute position detecting system
used for Σ-V large-capacity servo drives is different from that of SGDB Σ servo drives. As
a result, the infinite-length positioning system of the Σ servo drives must be changed for
use with Σ-V large-capacity servo drives. Be sure to make the following system modifica-
tions.
SERVOPACK
Σ Series
SGDB
Σ-II,
Σ-V (large-capacity)
Series
SGDM
SGDH
SGDV
∗
The action differs when the multiturn limit setting (Pn205) is changed. Refer to 4.5.6 Multiturn
Limit Setting.
PROHIBITED
Meaning
Absolute Output Range
Encoder of Rotational
Resolution Serial Data
12-bit -99999 to
15-bit + 99999
17-bit -32768 to
20-bit + 32767
When
Enabled
After restart
Action when Limit Is Exceeded
• When the upper limit (+99999) is exceeded
in the forward direction, the rotational
serial data will be 0.
• When the lower limit (-99999) is exceeded
in the reverse direction, the rotational serial
data will be 0.
• When the upper limit (+32767) is exceeded
in the forward direction, the rotational
*
serial data will be -32768.
• When the lower limit (-32768) is exceeded
in the reverse direction, the rotational serial
*
data will be +32767.
Classification
Setup