Speed Control; Basic Settings For Speed Control - YASKAWA SGD7S series Product Manual

6.5

Speed Control

There are two types of speed control: speed control with an analog voltage reference and
speed control with internal set speeds. This section describes speed control with an analog
voltage reference.
You input a speed reference into the SERVOPACK with an analog voltage to operate the Servo-
motor at the reference speed. Refer to the following section for information on speed control
with internal set speeds.
6.9 Internal Set Speed Control on page 6-54
• If you create a position loop in the host controller, you use the SERVOPACK for speed con-
trol.
• If you need to control only the speed of the Servomotor, you use the SERVOPACK for speed
control.
You set the control method in Pn000 = n.X (Control Method Selection).
Set Pn000 to n.0 to set the control method to speed control.
Parameter
n.0
Pn000
(default setting)
6.5.1

Basic Settings for Speed Control

This section describes the use of the V-REF (Speed Reference Input) Signal, /SPD-D (Motor
Direction Input) Signal, speed reference input gain, and speed reference offset adjustment in
speed control with analog voltages.
V-REF (Speed Reference Input) Signal
Input the V-REF (Speed Reference Input) signal to the SERVOPACK to operate the Servomotor
at a speed that is proportional to the input voltage.
Type
V-REF
Input
SG
Maximum input voltage: ±12 VDC
If you will use a host controller, such as a programmable controller, for position control, connect
the above output pins to the speed reference output terminals on the host controller.
Ho t controller
V-REF
D/A
Note: Always use twisted-pair cables to control noise.
/SPD-D (Motor Direction Input) Signal
You can turn the /SPD-D signal ON and OFF to change the direction of the Servomotor.
Classification
Input
Note: You must allocate the /SPD-D signal to use it. Use Pn50C = n.X (/SPD-D (Motor Direction) Signal Allo-
cation) to allocate the signal to a connector pin. Refer to the following section for details.
6.1.1 Input Signal Allocations on page 6-5
Speed control with analog references
Signal Connector Pin No.
CN1-5
CN1-6
ERVOPACK
CN1
5
Approx. 14 k
G
6
0 V
Signal Connector Pin No.
/SPD-D Must be allocated.

6.5.1 Basic Settings for Speed Control

Meaning
Meaning
Speed reference input signal
Signal ground for speed reference input signal
Changes the Servomotor direction.

6.5 Speed Control

When Enabled Classification
After restart Setup
Description
6
6-17