Mitsubishi Electric RD77MS2 - Page 228

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8 CONTROL SUB FUNCTIONS
8.3 Functions for Compensating the Control
■For "Ball screw" + "Reduction gear"
When the ball screw pitch is 10 mm, the motor is the HG-KR (4194304 pulses/rev) and the reduction ratio of the reduction
gear is 9/44.
First, find how many millimeters the load (machine) will travel (S) when the motor turns one revolution (AP).
Substitute this for the above expression (1).
At this time, make calculation with the reduction ratio 9/44 remaining as a fraction.
Thus, AP, AL and AM to be set are as follows.
or
*1 These two examples of settings are only examples. There are settings other than these examples.
■When "pulse" is set as the control unit
When using pulse as the control unit, set the electronic gear as follows.
AP = "Number of pulses per rotation"
AL = "Movement amount per rotation"
AM = 1
Ex.
When the motor is the HG-KR (4194304 pulses/rev)
Setting value Setting item
AP = 23068672 [Pr.2]
AL = 11250.0 [Pr.3]
AM = 1 [Pr.4]
Setting value Setting item
AP = 23068672 [Pr.2]
AL = 1125.0 [Pr.3]
AM = 10 [Pr.4]
Setting value Setting item
AP = 4194304 [Pr.2]
AL = 4194304 [Pr.3]
AM = 1 [Pr.4]
Reduction ratio 9/44
M
AP (Number of pulses per rotation)
ΔS (Movement amount per rotation)
= 10 [mm]
× 9/44
When the control unit is
"mm", the minimum
command unit is 0.1 m.
= 4194304 [pulse]
= Ball screw pitch
× Reduction ratio
= 10000.0 [μm]
× 9/44
AP
ΔS
=
4194304 [pulse]
10000.0 [μm] × 9/44
=
4194304 × 44
10000.0 × 9
=
184549376
90000.0
=
23068672
11250.0
=
23068672(AP)
11250.0(AL) × 1(AM)
=
23068672(AP)
1125.0(AL) × 10(AM)