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5. PARAMETERS
(1) Concept of electronic gear
Use the electronic gear (parameters No.PA06, PA07) to make adjustment so that the servo amplifier setting
matches the moving distance of the machine. Also, by changing the electronic gear value, the machine can
be moved at any multiplication ratio to the moving distance on the servo amplifier.
Parameters No. PA06
Parameters No. PA07
CMX
CDV
Electronic gear
Parameters No. PA06, PA07
Encoder feedback pulses
CMX
CDV
Deviation
counter
Motor
Encode
r
Moving
distance
+
-
The following examples are used to explain how to calculate the electronic gear value.
POINT
The following specification symbols are needed for electronic gear calculation.
Pb : Ball screw lead [mm]
n : Reduction ratio
Pt : Servo motor resolution [pulse/rev]
S : Travel per servo motor revolution [mm/rev]
(a) Ball screw setting example
Machine specifications
Ball screw lead: Pb
10 [mm]
Reduction ratio: n
1/2
Servo motor resolution: Pt
262144 [pulse/rev]
Servo motor 262144[pulse/rev]
n
NM
NL
Pb=10[mm]
n=NL/NM=1/2
CMX
CDV
S
p
t
5000
262144
625
32768
p
t
n 1000
p
b
262144
1/2 10 1000
Hence, set 32768 to CMX and 625 to CDV.
(b) Conveyor setting example
Machine specifications
Pulley diameter: r
160 [mm]
Reduction ratio: n
1/3
Servo motor resolution: Pt
262144 [pulse/rev]
Servo motor
262144[pulse/rev]
r=160[mm]
n
NM
NL
n=NL/NM=1/3
CMX
CDV
p
t
S
32768
20944
167551.61
262144
p
t
n r 1000
262144
1/3 160 1000
Reduce CMX and CDV to the setting range or less, and round off the first decimal place.
Hence, set 32768 to CMX and 20944 to CDV.