YASKAWA E-7-Series SGD7S - Multiturn Limit Setting

6.12 Absolute Encoders
6.12.8 Multiturn Limit Setting
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Application Functions
The data format of the alarm information is shown below.
6.12.8 Multiturn Limit Setting
The multiturn limit is used in position control for a turntable or other rotating body.
For example, consider a machine that moves the turntable shown in the following diagram in
only one direction.
Because the turntable moves in only one direction, the upper limit to the number of revolutions
that can be counted by an absolute encoder will eventually be exceeded.
The multiturn limit is used in cases like this to prevent fractions from being produced by the
integral ratio of the number motor revolutions and the number of turntable revolutions.
For a machine with a gear ratio of n:m, as shown above, the value of m minus 1 will be the set-
ting for the multiturn limit setting (Pn205).
Multiturn limit (Pn205) = m - 1
The relationship between the number of turntable revolutions and the number of motor revolu-
tions is shown in the following graph for when m is 100 and n is 3.
Set Pn205 to 99.
Pn205 = 100 - 1 = 99
Note: This parameter is enabled when you use an absolute encoder.
The data will change as shown below when this parameter is set to anything other than the
default setting.
A
L
M
0 to 9
0 to 9
.
CR
Upper two digits
of alarm code
S
Pn205
Multiturn Limit
Setting Range Setting Unit Default Setting When Enabled Classification
0 to 65,535 1 Rev 65,535 After restart Setup
Turntable
Gear
Motor
0
1
2
3
4
5
6
7
8
9
100 200 300 0
100
50
Number of table rotations
Multiturn data
Number of table rotations
Multiturn data
Setting of Pn205 = 99
Number of rotations
Speed
Position
Torque