Improvement Of Dividing Output Resolution - YASKAWA SGMAH User Manual

Sigma II User's Manual
Parameter Digit
No. Place
Pn003 0
1

5.10.3 Improvement of Dividing Output Resolution

The upper limit of conventional dividing pulse setting (Pn201) is 16384 [P/R] that is
decided for 16-bit encoder. However, direct-drive servomotors are equipped with 20-bit
encoder as standard. Therefore, the parameter Pn212 is added to adapt the dividing pulse
setting for 20-bit encoder.
For the dividing pulse setting, either the existing Pn210 or the newly added Pn212 can be
used.
Select Pn201 or Pn212 by the switch for parameters. The factory setting is Pn201.
• Dividing pulse is set in the resolution 16-bit or less, use Pn201.
• Dividing pulse is set in the resolution 17-bit or more, use Pn212.
For the setting method of dividing ratio for 17-bit or more resolution, refer to [Setting PG
dividing ratio of 5-digit or more] on the next page.
The setting range of Pn212 differs depending on the encoder used.
The upper limit of dividing output frequency is 1.4 Mpps because of the restrictions on the
hardware. Therefore, setting a high number of pulses limits the motor speed.
The table below shows the setting conditions when Pn212 is used.
Name Setting
Analog Monitor 1 0
Analog Monitor 2
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Chapter 5: Parameter Settings and Functions
Contents
Motor speed: 1V/100 rpm
Speed reference: 1V/100 rpm
Torque reference: 1V/100%
Position error: 0.05V/1 reference unit
Position error: 0.05V/100 reference units
Reference pulse frequency [converted to
rpm]: 1V/100 rpm
Motor speed ×4: 1V/25 rpm
Motor speed ×8: 1V/12.5 rpm
Reserved parameters (Do not use.)
5-132
Factory
Setting
2
0