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Basic Parameters1 - Mitsubishi Electric RD77MS2 User Manual

Melsec iq-r simple motion module.
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  • Contents

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Basic parameters1

This section describes the details on the basic parameter 1.
n: Axis No. - 1
Item
[Pr.1]
Unit setting
Movement
[Pr.2]
amount
Number of pulses per rotation (AP) (Unit: pulse)
per pulse
[Pr.3]
Movement amount per rotation (AL)
[Pr.4]
Unit magnification (AM)
[Pr.7]
Bias speed at start
[Pr.1] Unit setting
Set the unit used for defining positioning operations. Choose from the following units depending on the type of the control
target: mm, inch, degree, or pulse. Different units can be defined for different axes.
Ex.
Different units (mm, inch, degree, and pulse) are applicable to different systems:
• mm or inch: X-Y table, conveyor (Select mm or inch depending on the machine specifications.)
• degree: Rotating body (360 degrees/rotation)
• pulse: X-Y table, conveyor
*1 When you change the unit, note that the values of other parameters and data will not be changed automatically.
After changing the unit, check if the parameter and data values are within the allowable range.
Set "degree" to exercise speed-position switching control (ABS mode).
[Pr.2] to [Pr.4] Electronic gear (Movement amount per pulse)
Mechanical system value used when the Simple Motion module performs positioning control.
The settings are made using [Pr.2] to [Pr.4].
The electronic gear is expressed by the following equation.
Electronic gear
=
Movement amount per rotation (AL) × Unit magnification (AM)
*1 When positioning has been performed, an error (mechanical system error) may be produced between the specified movement amount
and the actual movement amount.
The error can be compensated by adjusting the value set in electronic gear.
Page 225 Electronic gear function
• The result of below calculation (round up after decimal point) is a minimum pulse when the current feed
value is updated at follow-up processing. (The movement amount for droop pulse is reflected as the current
feed value when the droop pulse becomes more than above calculated value in pulse unit of motor end.)
Number of pulses per rotation (AP) / (Movement amount per rotation (AL)  Unit magnification
(AM)  3375) [pulse]
Refer to the following for the follow-up processing.
Page 302 Follow up function
12 DATA USED FOR POSITIONING CONTROL
12.3 Basic Setting
Setting value, setting range
Value set with the
engineering tool
0: mm
1: inch
2: degree
3: pulse
1 to 200000000
The setting value range differs according to the "[Pr.1]
Unit setting".
1: 1 times
10: 10 times
100: 100 times
1000: 1000 times
The setting value range differs according to the "[Pr.1]
Unit setting".
Number of pulses per rotation (AP)
Default
value
Value set with a
program
0
3
1
2
3
1 to 200000000
20000
20000
1
1
10
100
1000
0
Buffer memory
address
0+150n
2+150n
3+150n
4+150n
5+150n
1+150n
6+150n
7+150n

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