YASKAWA SGD7S Product Manual page 213

6.5 Speed Control
6.5.1 Basic Settings for Speed Control
Setting the Speed Reference Input Gain (Pn300)
The reference voltage for the rated motor speed is set for the speed reference input gain
(Pn300) to define the relationship between the position reference voltage and the motor speed.
Pn300
-30
Adjusting the Speed Reference Offset
With speed control, the Servomotor may sometimes rotate at a very low speed for a speed ref-
erence of 0 V (with a reference speed of 0 or when the speed reference is stopped). This
occurs because the internal reference in the SERVOPACK has a slight offset.
If the Servomotor moves at a very low speed, the offset needs to be eliminated by adjusting the
offset.
You can adjust the speed reference offset either automatically or manually.
Motor speed
 Automatically Adjusting the Speed Reference Offset
To automatically adjust the speed reference offset, the amount of offset is measured and the
speed reference voltage is adjusted automatically.
The measured offset is saved in the SERVOPACK.
Information
6-18
Speed Reference Input Gain
Setting Range Setting Unit
150 to 3,000
Motor speed [min
Rated motor speed
Minimum input voltage (12 V)
-12 -6
Input range (0 to 12 V)
Offset
Speed
reference
Offset
voltage
adjustment
The offset does not use a parameter, so it will not change even if the parameter settings are
initialized.
Default Setting
600 (rated speed
0.01 V
for 6.00 V)
1
]
Default setting
1.5 6 12
Setting range (1.50 to 30.00 V)
Motor speed
Speed
reference
voltage
Speed Position
When Enabled Classification
Immediately
Maximum input voltage (+12 V)
Speed reference
30
voltage [V]
The offset is adjusted in the
SERVOPACK.
Offset adjustment range:
15,000 (speed reference: 879 mV)
Offset setting unit: 8
(speed reference: 0.47 mV)
Torque
Setup