Mitsubishi MR-JE-40A - How to Set the Electronic Gear

7. PARAMETERS
7 - 69
7.3 How to set the electronic gear
(1) Setting [mm], [inch], or [pulse] with "Position data unit" of [Pr. PT01].
Adjust [Pr. PA06] and [Pr. PA07] to match the servo amplifier setting with the travel distance of the
machine.
Travel distance
CDV
CMX
Deviation counter
+
-
Electronic gea
r
([Pr. PA06]/[Pr. PA07])
Servo motor
Encoder
M
Pt: Servo motor encoder revolution 131072 [pulse/rev]
Δ
S: Travel distance per servo motor revolution [mm/rev]/[inch/rev]/[pulse/rev]
CMX/CDV = Pt/ΔS
Set the electronic gear within the following range. Setting out of the range will trigger [AL. 37 Parameter
error].
Electronic gear setting range
1/865 < CMX/CDV < 271471
(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].
Travel distance
CDV
CMX
Deviation counter
+
-
Electronic gear
([Pr. PA06]/[Pr. PA07])
Servo motor
Encoder
M
Pt: Servo motor encoder encoder revolution 131072 [pulse/rev]
360000
Pt
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 × Pt)/(CDV × 360000) is
reduced to its lowest terms.
The following shows a setting example of the electronic gear.
The number of gear teeth on machine side: 25, and the number of gear teeth on servo motor side:
11
Set [Pr. PA06] = 25 and [Pr. PA07] = 11.
Pt (Servo motor resolution): 131072 pulses/re
v
Z
1: Number of gear teeth on servo motor side
Z
2: Number of gear teeth on machine side
Z
1: Z2 = 11:25
Servo motor
Machine
Z2
Z1