Omron NX701-1 User Manual

5-19
5 Motion Control Parameters
NJ/NX-series CPU Unit Motion Control User’s Manual (W507)
5-2 Axis Parameters
5
5-2-3 Unit Conversion Settings
In this example 2, an OMRON 1S-series Servomotor with a 23-bit absolute encoder is used.
Mechanically, the reduction ratio of the reducer is 3/5 and the conveyor moves 80 mm for every rota-
tion of the pulley. The travel distance per conveyor rotation is 360 mm.
The Unit of Display parameter is set to millimeters. The Command Pulse Count Per Motor Rotation
is set to the resolution of the encoder on the Servomotor.
The travel distance per conveyor rotation is automatically set by the result of “Modulo maximum
position - Modulo minimum position”.
A reducer with a reduction ratio of 3/5 is used, so the pulley turns three times for every five rotations
of the Servomotor. The conveyor travel distance per pulley rotation is 80 mm and the travel distance
per conveyor rotation is 360. For this reduction ratio setting, the work gear ratio is set to 240 (3 × 80)
and the motor gear ratio is set to 1,800 (5 × 360).
Additional Information
• If the travel distance per pulley rotation is not an integer (e.g. 80.1 mm), use a ratio multiplied
by the coefficient of 10, which converts values to integers, to calculate the work gear ratio and
the motor gear ratio. When the above example is used, the work gear ratio is set to 2,403 (3 ×
80.1 × 10), and the motor gear ratio is set to 18,000 (5 × 360 × 10).
• In the same way as the above example 2, when a multi-step reducer is used, multiply several
ratios together and use a final ratio to set the work gear ratio and the motor gear ratio.
Parameter name Setting
Modulo Maximum Position 360
Modulo Minimum Position 0
Parameter name Setting
Unit of Display mm
Command Pulse Count
Per Motor Rotation
8,388,608
Work Travel Distance Per
Rotation
Modulo maximum position - Modulo minimum position
Work Gear Ratio 240
Motor Gear Ratio 1,800
Travel distance per conveyor
rotation = 360 mm
(Modulo maximum position/Modulo
minimum position: 0 to 360)
Travel distance per pulley
rotation = 80 mm
Servomotor encoder resolution: 23 bits/rotation
(8,388,608 pulses per rotation)
Reduction
ratio: 3/5
Reducer
Servomotor
Mechanical
ratio: 80/360
Final ratio:
==
3 × 80
5 × 360
Work Gear Ratio
Motor Gear Ratio

Omron NX701-1 Specifications

General

Brand	Omron
Model	NX701-1
Category	Controller
Language	English