Fully-Closed System - YASKAWA SGD7S Product Manual

10.1 Fully-Closed System

10.1

Fully-Closed System

With a fully-closed system, an externally installed encoder is used to detect the position of the
controlled machine and the machine's position information is fed back to the SERVOPACK.
High-precision positioning is possible because the actual machine position is fed back directly.
With a fully-closed system, looseness or twisting of mechanical parts may cause vibration or
oscillation, resulting in unstable positioning.
The following figure shows an example of the system configuration.
*
The connected devices and cables depend on the type of external linear encoder that is used.
Note: Refer to the following section for details on connections that are not shown above, such as connections to
power supplies and peripheral devices.
10-2
Servomotor Main
Circuit Cable
External encoder (Not
provided by Yaskawa.)
2.4 Examples of Standard Connections between SERVOPACKs and Peripheral Devices on page 2-25
SERVOPACK
Fully-closed Module
External
Encoder Cable*
Serial Converter
Unit Cable*
Serial
Converter Unit*