Using An Absolute Encoder; For Speed/Torque Control - YASKAWA SGM series User Manual

APPLICATIONS OF Σ-SERIES PRODUCTS

3.8.5 Using an Absolute Encoder

3.8.5 Using an Absolute Encoder
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1) Outline
An absolute value detection system detects an absolute position of the machine even
when the servo system is OFF. If such a system is to be formed in the host controller, use
an SGM or SGMP Servomotor with absolute encoder. Consequently, automatic opera-
tion can be performed without zero return operation immediately after the power is turned
ON.
SGMjjjW1j
(SGMPjjjW1j)
12-bit absolute encoder
2) Standard Connection Diagram for a 12-bit Absolute Encoder Mounted on a Servo-
motor
• Interface Circuit
Host controller
Battery
Serial
Line receiver
interface
circuit
Up/ De-
Clear
down
coder
counter
Serial
interface
circuit
Line Receiver Used:
Termination Resistor R: 220 to 470 Ω

For Speed/Torque Control

(SGDA-jjjS)
Normally, PAO serial data is used. In this
case, PS serial interface is unnecessary.
Always detects
absolute position
Servopack
SN75175 or MC3486 manufactured by Texas Instruments Inc.
For Position Control (SGDA-jjjP)
SEN signal is not used.
Normally, PSO serial data is used. In this
case, PA serial interface is unnecessary.
Zero return
operation
Servomotor
12-bit absolute encoder
Represents twisted pair
wires