Mitsubishi FX2N-10GM, Hardware / Programming Manual

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FX Series Positioning Controllers Parameters 4
4-10
Concept of mechanical system of units
When PARA. 0 (system of units) is set to "0" or "2", the mechanical system of units ("mm",
"deg", "inch", etc.) is selected. At this time, there is no parameter to select either one among
"mm", "deg", "inch", etc. However, because all of the positioning parameters as well as the
positioning data and the speed data used in the positioning program adopt one same unit, the
same pulse output is acquired without regard to the unit as far as the set value is equivalent.
Example:
Condition
Pulse rate :4,000 [PLS/REV]
Feed rate :100 [
µ
m/REV, mdeg/REV,
×
10
-1
minch/REV]
Minimum command unit :3 (The movement quantity is regarded as "10
-3
mm","10
-3
deg" or "10
-4
inch".)
Electronic gear in servo amplifier :1/1
When you set values in "mm"
In a positioning operation with the movement quantity of 100 [
×
10
-3
mm] and the operation
speed of 6 [cm/min], the following pulse output is given.
Generated pulse quantity= Movement quantity
*1
/ Feed rate
*1
×
Pulse rate
= 100 [
×
10
-3
mm]/100 [
µ
m/REV] x 4,000 [PLS/REV]
= 4,000 [PLS]
Pulse frequency = Operation speed
*1
/ Feed rate
*1
×
Pulse rate
= 6 [cm/min]
×
10
4
/60/100 [
µ
m/REV]
×
4,000 [PLS/REV]
= 40,000 [Hz]
*1 The unit is aligned during calculation. 1 mm = 10
3
µ
m, 1 cm = 10
4
µ
m, 1 min = 60 s
When you set values in "deg"
In a positioning operation with the movement quantity of 100 [
×
10
-3
deg] and the operation
speed of 6 [deg/min], the following pulse output is given.
Generated pulse quantity= Movement quantity
*2
/ Feed rate
*2
×
Pulse rate
= 100 [x 10
-3
deg]/100 [mdeg/REV]
×
4,000 [PLS/REV]
= 4,000 [PLS]
Pulse frequency = Operation speed
*2
/ Feed rate
*2
×
Pulse rate
= 6 [deg/min]
×
10
4
/60/100 [mdeg/REV]
×
4,000 [PLS/REV]
= 40,000 [Hz]
*2 The unit is aligned during calculation. 1 deg = 10
3
mdeg, 1 min = 60 s
When you set values in "inch"
In a positioning operation with the movement quantity of 100 [
×
10
-4
inch] and the operation
speed of 6 [inch/min], the following pulse output is given.
Generated pulse quantity= Movement quantity
*3
/ Feed rate
*3
×
Pulse rate
= 100 [
×
10
-4
inch]/100 [
×
10
-1
minch/REV]
×
4,000 [PLS/REV]
= 4,000 [PLS]
Pulse frequency = Operation speed
*3
/ Feed rate
*3
×
Pulse rate
= 6 [inch/min] x 10
4
/60/100 [
×
10
-1
minch/REV]
×
4,000 [PLS/REV]
= 40,000 [Hz]
*3 The unit is aligned during calculation. 1 inch = 10
3
minch, 1 min = 60 s