Mitsubishi Electric MR-J4-TM Instruction Manual page 224

5. PARAMETERS
(b) Setting example of a conveyor
Machine specifications
Pulley diameter: r = 160 [mm]
Reduction ratio: 1/n = Z
Z : Number of gear teeth on servo motor side
1
Z : Number of gear teeth on load gear
2
Servo motor encoder resolution P
CMX P
t
= =
ΔS
CDV
Note. Because the command unit is "mm", α is 1000. When the unit is "inch", α is 10000. When the unit is "pulse", α is 1.
Reduce CMX and CDV to within the setting range or lower and round off each value to the closest
whole number.
Therefore, set CMX = 524288 and CDV = 20944.
(2) Setting [degree] with "Position data unit" of [Pr. PT01].
Set the number of gear teeth on machine side to [Pr. PA06] and the number of gear teeth on servo
motor side to [Pr. PA07].
Set the electronic gear within the following range. Setting out of the range will trigger [AL. 37 Parameter
error].
(a) Set values to make numerator and denominator 16384 or lower if the electronic gear (CMX/CDV) is
reduced to its lowest terms.
(b) Set values to make numerator and denominator 16777216 or lower if (CMX × P
reduced to its lowest terms.
The following shows a setting example of the electronic gear.
Number of gear teeth on machine side: 25, number of gear teeth on servo motor side: 11
Set [Pr. PA06] = 25 and [Pr. PA07] = 11.
/Z = 1/3
1 2
= 4194304 [pulse/rev]
t
P
t
=
n r π α (Note) 1/3 160 π 1000
Electronic gear
([Pr. PA06]/[Pr. PA07])
Travel distance
Pt: Servo motor encoder resolution: 4194304 [pulse/rev]
Servo motor
Pt (Servo motor resolution): 4194304 pulses/rev
Z1: Number of gear teeth on servo motor side
Z2: Number of gear teeth on machine side
Z1: Z2 = 11:25
r = 160 [mm]
1/n
Z
1/n = Z /Z = 1/3
1 2
4194304 4194304
=
167551.61
+
CMX Pt
CDV 360000
-
Machine
Z2
Z1
5 - 85
Servo motor encoder resolution
4194304 [pulse/rev]
Z
2 1
524288
20944
Servo motor
Deviation counter
Encoder
)/(CDV × 360000) is
t
M