7 Before Starting Positioning Operation
123
FX3U-20SSC-H Positioning Block User's Manual
1
Introduction
2
System
configuration
3
Example
Connection
4
Installation
5
Wiring
6
Memory
configuration
and data
7
Before starting
positioning
control
8
Manual control
9
Positioning
Control
10
Table Operation
7.10 Precautions for using the user units (mechanical or composite
2. Converted pulse data
Enter data within the setting range of converted pulse data, when setting ranges overlap. The equation for
conversion is as follows.
1) Travel distance
Travel distance in converted pulse data (PLS) =
Travel distance (µm, 10
-4
inch, mdeg) × position data magnification × (pulse rate / feed rate)
2) Operation speed
Operation speed in converted pulse data (Hz) =
Operation speed (cm/min, inch/min, 10deg/min) × 10
4
× (pulse rate / feed rate) / 60
Servomotor rotation speed and operation speed (converted pulse data)
Do not exceed the maximum rotation speed of the servomotor when specifying the operation speed (including
the maximum speed, jog speed and zero return speed). The servomotor rotation speed is calculated from the
speed (converted pulse data) as follows.
Servomotor rpm (r/min) =
The converted pulse data of operation speed (Hz) × 60 / the resolution per revolution of servomotor
3. Error
Supposing that the pulse rate be A, feed rate be B, and relative travel distance be C, C × (A/B) is the number
of pulses output from 20SSC-H.
No command error occurs as long as (A/B) is an integer. C × (A/B) does not have to be an integer.
However, if C × (A/B) is not an integer, repetitive operation of relative movement causes an accumulated
error in the current address. In absolute address operation, an error within 1 pulse occurs with the calculation
result rounded off, but it does not cause an accumulated error.
In addition, an accumulated error does not occur in the motor system of units.
4. Maximum speed restriction
To specify speed data in the mechanical system of units, enter data in the range between 1 and
50,000,000Hz in converted pulse data.
BFM Number
Data type
X-axis Y-axis
Pulse rate BFM #14005,#14004 BFM #14205,#14204 Positioning parameters
Feed rate BFM #14007,#14006 BFM #14207,#14206 Positioning parameters
Position data
magnification
Operation parameter BFM #14000 b5,b4 BFM #14200 b5,b4 Positioning parameters
Travel distance
Target address 1 BFM #501,#500 BFM #601,#600 Control data
Target address 2 BFM #505,#504 BFM #605,#604 Control data
Operation speed
setting
Operation speed 1 BFM #503,#502 BFM #603,#602 Control data
Operation speed 2 BFM #507,#506 BFM #607,#606 Control data
Servo amplifier Resolution per revolution or servomotor (PLS/REV)
MR-J3- B, MR-J3W- B, MR-J3- BS
262144
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