Introduction - YASKAWA SGD7S-R70A20A023F40B Product Manual

3.1

Introduction

Pressure feedback control is performed by inputting a feedback signal from a pressure sensor
to a MECHATROLINK-III pressure command (i.e., torque control command).
For the FT40 (11th to 13th digits in SERVOPACK model number: F40), an analog signal from a
pressure sensor built into the control target is passed through a pressure sensor amplifier and
then directly input to the CN1 connector on the SERVOPACK.
For the FT41 (11th to 13th digits in SERVOPACK model number: F41), MECHATROLINK-III
data from a pressure sensor built into the control target is passed through a pressure sensor
amplifier and through MECHATROLINK-III distributed I/O, then directly input to the CN6A and
CN6B connectors on the SERVOPACK.
Pressure feedback control can be used to perform high-speed, high-precision pressure control.
Pressure feedback control is performed in Torque Control Mode. It cannot be used in Speed
Control Mode or Position Control Mode. In pressure feedback control, you can only use posi-
tive torque references. You cannot use a negative torque reference. Change Pn000 = n.X
(rotation direction selection) as necessary.
Stop the motor before you change from Speed Control Mode or Position Control Mode to
Torque Control Mode.
• FT40
MECHATROLINK-III
pressure command
• FT41
MECHATROLINK-III
pressure command
*
For MECHATROLINK-III distributed I/O, we recommend R7G4HML3-6-LC2 I/O Modules from M-System Co., Ltd.
SERVOPACK
Pressure
Speed limit
feedback
processing
control
processing
Filtering
SERVOPACK
Pressure
feedback
Speed limit
control
processing
processing
Filtering
Filtering
CN1
AD
converter
Filtering
CN6A/6B
MECHATROLINK-III
distributed I/O*

3.1 Introduction

Motor
and
mechanism
Analog signal:
-12 V to 12 V
Pressure
Pressure
sensor
sensor
amplifier
Motor
and
mechanism
Pressure
sensor
3-3
3