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5.3 Speed Control
5-23
(2) Parameter Setting
Using Pn300, set the analog voltage level for the speed reference (V-REF) necessary to operate the servomotor
at the rated speed.
5.3.2 Reference Offset Adjustment
In speed control, the servomotor may move at a very low speed with a voltage reference of 0 V. This occurs
because the internal reference voltage of the SERVOPACK has a slight offset of a few millivolts. It is called
"offset".
If the servomotor moves at a very low speed, the offset
needs to be eliminated using the offset adjustment
function.
Use either automatic adjustment or manual adjustment. Aut
omatic adjustment uses the automatic adjustment
parameter for reference offset (Fn009). Manual adjustment uses the manual adjustment parameter for refer-
ence offset (Fn00A).
Pn300
Speed Reference Input Gain
Classification
Setting Range Setting Unit Factory Setting When Enabled
150 to 3000 0.01 V/rated speed
600
(Rated speed at 6.00 V)
Immediately Setup
Motor speed (mm/s)
Minimum input voltage (−12 V)
Maximum input voltage (+12 V)
Speed reference voltage (V)
Setting range (1.50 to 30.00 V)
Input range (0 to ± 12 V)
-6
6 1.5 12 30
-12 -30
Factory setting
Rated speed
Offset
The offset is adjusted
in the SERVOPACK.
Offset
adjustment
Speed
reference
voltage
Speed
reference
voltage
Offset Adjustment Range:
±
15000 (Speed reference: ±879 mV)
Offset Setting Unit: 8
(Speed reference: 0.47 mV)
Motor
speed
Motor
speed
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