Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 744 / 1218

(A) Application parameters Parameters
5 - 542
Encoder orientation gear ratio setting (Pr. 394, Pr. 395) (Vector control)
Set the encoder orientation gear ratio for machine end orientation control.
Set the encoder orientation gear ratio in Pr. 394 "Number of machine side gear teeth" and in Pr. 395
"Number of motor side gear teeth". An accurate gear ratio (or pulley ratio) from the motor shaft to the
spindle is necessary.
Set correct numbers of gear teeth in Pr. 394 and Pr. 395.
Pr. 394 = A × C × E
Pr. 395 = B × D × F
Exercise care so that the A × C × E and B × D × F settings do not exceed 32767.
If either or both of them exceed that value, make approximations.
A: 15, C: 43, E: 60, B: 10, D: 28, F: 55
Pr. 394 = 15 × 43 × 60 = 38700
Pr. 395 = 10 × 28 × 55 = 15400
Since Pr. 394 setting exceeds 32767 at this time, make approximations as follows:
Fig. 5-259:
Gear ratio
I002873E
NOTE The pulley ratio is the ratio of vector-driven motor side pulley diameter to spindle side pulley
diameter.
Example Setting example
When the numbers of gear teeth are as follows:
Pr. 394
=
38700
=
3870
Pr. 395 15400 1540
A
B
C
D E
F
Spindle
Motor
(A to F indicate the
numbers of gear teeth.)
A
A
B
B
Spindle side Motor side