Mitsubishi Electric FX3U-1PG, User Manual

Page: 61 / 146

7 Buffer Memory
7.3 Positioning Parameters
55
FX
3U
-1PG User's Manual
1
Introduc
tion
2
Speci
ficati
on
3
Sy
stem
Configurati
on
4
Ins
tallati
on
5
Wi
rin
g
6
Be
fore Starti
ng
Po
sition
ing
Operation
7
Buf
fer M
emory
8
Man
ual
C
ontrol
9
Posi
tioni
ng
Co
ntrol
10
Program Ex
ampl
e
7.3 Positioning Parameters
Set the units and speed used for positioning control.
For the positioning parameter, there are two types: the extension positioning parameter, for which the setting
range is extended, and the positioning parameter. The difference between the positioning parameter and the
extension positioning parameter is as follows.
• Positioning parameter (BFM#0 to #15)
Same allocation as the BFM of the FX
2N
-1PG. It is used when operation is executed without changing the
FX
2N
-1PG program.
• Extension positioning parameter (#32 to #52)
Different allocation from the BFM of the FX
2N
-1PG. It uses the extended set range of the pulse rate, the
bias speed, and the creep speed. Or, it is used when setting the acceleration time and the deceleration
time individually.
Point
• The positioning parameter becomes valid at operation start-up. Therefore, set before the start-up of the
operation.
When the setting is changed during operation or during the remaining distance operation waiting, the
change is not reflected to the current operation but from the next operation.
• Setting of the positioning parameter selection (BFM#32) determines whether the positioning parameter is
used or the extension positioning parameter is used.
7.3.1 [BFM#0] Pulse rate
Set the number of pulses required to rotate the motor for one turn.
Setting is necessary when the unit system is set to "machine system unit" or "combined system unit."
When "motor system unit" is selected, the setting here will be ignored.
→
For details on the system of units, refer to Subsection 7.3.3.
Point
• If any electronic gearing is present in the servo amplifier, it is necessary to consider its effect.
The relationship between pulse rate and electronic gearing is shown below.
Pulse rate = Resolution power of encoder (positioning feedback pulses) ÷ Electronic gearing
• When the extension positioning parameter is used, use the pulse rate (BFM#34, #33).
7.3.2 [BFM#2, #1] Feed rate
Set the travel distance of the machine for one turn of the motor.
Setting is necessary when the unit system is set to "machine system unit" or "combined system unit."
When "motor system unit" is selected, the setting here will be ignored.
→ For details on the system of units, refer to Subsection 7.3.3.
Point
When the extension positioning parameter is used, use the feed rate (BFM#36, #35).
BFM No.
Description R/W Default
High order
16bit
Low order
16bit
- #0 Setting range: 1 to 32,767 PLS/REV R/W K2,000
BFM No.
Description R/W Default
High order
16bit
Low order
16bit
#2 #1
Setting range: 1 to 2,147,483,647 (μm/REV, mdeg/REV, 10
-4
inch/REV)
R/W K1,000