YASKAWA SERVOPACK Sigma 7S Series, Supplementary Manual

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1.1 Speed Control
1.1.1 Basic Settings for Speed Control
1-4
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.
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.

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.
Pn300
Speed Reference Input Gain
Setting Range Setting Unit Default Setting When Enabled Classification
150 to 3,000 0.01 V
600 (rated speed
for 6.00 V)
Immediately Setup
The offset does not use a parameter, so it will not change even if the parameter settings are
initialized.
Speed Position Torque
-6
6 1.5 12 3 0
-12 - 3 0
Input range (0 to ± 12 V)
S etting range (1.50 to 3 0.00 V)
S peed reference
voltage (V)
Minimum input voltage ( − 12 V)
Rated motor s peed
Maximum input voltage (+12 V) Default s etting
Motor s peed (min − 1 or mm/ s )
Off s et s etting unit: 8
( s peed reference: 0.47 mV)
± 15,000 ( s peed reference: ± 879 mV)
Off s et adju s tment range:
The off s et i s adju s ted in the
S ERVOPACK.
S peed
reference
voltage
Motor s peed
Off s et
adju s tment
S peed
reference
voltage
Off s et
Motor s peed
Information