Yaskawa MP920 Motion Module - Manual (Page 199)

5.4 SVA-01A and SVA-02A Parameters
5-57
5
19 Travel Distance Per
Machine Rotation
(PITCH) Set the load travel distance (reference unit) per load axis rotation.
• Setting range: 1 to 2 31 -1
10000
Ball screw Ball screw pitch = 10 mm
Reference Unit Selection = mm
Number of digits below decimal point = 3
↓
Set the travel distance per machine rotation to
10000.
Rotating table One table rotation = 360 °
Reference Unit Selection = deg
Number of digits below decimal point = 3
↓
Set the travel distance per machine rotation to
360000
Belt One roller rotation = 360 °
Reference Unit Selection = mm
Number of digits below decimal point = 3
↓
Set the travel distance per machine rotation to
πD × 1000.
21 Servomotor Gear
Ratio
(GEAR_MOTOR) These parameters determine the gear ratio between the motor and the load.
The following two values are set for a configuration in which the load shaft will
turn n times in response to m turns of the motor shaft.
• Gear ratio at Servomotor: m
• Gear ratio at load: n
Setting Example
In the above example, the reduction ratio is n/m, or 3/7 × 4/9 = 4/21. The follow-
ing setting would thus be made.
Servomotor Gear Ratio: 21
Load Gear Ratio: 4
1
22 Machine Gear Ratio
(GEAR_MACHINE) 1
Table 5.5 Motion Fixed Parameters (cont’d)
No. Name Description Factory
Setting
10
Ball screw pitch = 10 mm
One rotation = 360 °
π D
D
Motor shaft:
m turns Load shaft: n turns
3 turns
9 turns
7 turns
4 turns