11 Fully-Closed Loop Control
11.1 Overview
This chapter provides detailed information on performing fully-closed loop control with the
SERVOPACK.
11.2 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 SER-
VOPACK. 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.
Refer to the following manual for details on Fully-closed Modules.
& Σ-7-Series Peripheral Device Selection Manual (Manual No.: SIEP S800001 32)
The following figure shows an example of the system configuration.
SERVOPACK
Servomotor Main
Circuit Cable
Serial Converter
Unit Cable*
Serial Converter
Unit*
External
Encoder Cable*
External encoder (Not
provided by Yaskawa.)
Fully-closed Module
Fig. 334: Fully-Closed System - Rotary Servomotor
* The connected devices and cables depend on the type of external linear encoder that
is used.
Sigma-7 Series SERVOPACKs
Fully-Closed Loop Control
Fully-Closed System
| | PROFINET Communications - SIEP YEUOC7P 02A Revision 0 | en | 454
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