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5. PARAMETERS
5.4 How to set the electronic gear
5.4.1 Electronic gear setting for the profile mode
(1) Setting [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.
The following setting example explains how to calculate the electronic gear.
(a) Setting example of a ball screw
Machine specifications
Ball screw lead Pb = 10 [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.
Therefore, set CMX = 524288 and CDV = 625.
([Pr. PA06]/[Pr. PA07])
Travel distance
Pt: Servo motor encoder resolution: 4194304 [pulse/rev]
ΔS: Travel distance per servo motor revolution [mm/rev]/[inch/rev]/[pulse/rev]
CMX/CDV = Pt/ΔS
POINT
To calculate the electronic gear, the following specification symbols are
required.
Pb: Ball screw lead [mm]
1/n: Reduction ratio
P
: Servo motor encoder resolution [pulse/rev]
t
∆S: Travel distance per servo motor revolution [mm/rev]
/Z
= 1/2
1
2
= 4194304 [pulse/rev]
t
P
4194304
t
=
n Pb α (Note)
1/2 10 1000
Electronic gear
+
CMX
Deviation counter
CDV
-
1/n = Z
/Z
1
Servo motor encoder resolution
4194304 [pulse/rev]
4194304
=
=
5000
5 - 84
Servo motor
M
Encoder
1/n
= 1/2
2
Z
2
Pb = 10 [mm]
Z
1
524288
625
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