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4. PARAMETERS
4.1.7 Electronic gear
Parameter
Initial
value
Setting
range
Unit
Control mode
No.
Symbol
Name
Position
Internal
speed
Internal
torque
PA06
CMX
Electronic gear numerator
(Command pulse multiplying factor numerator)
1
1 to
65535
PA07
CDV
Electronic gear denominator
(Command pulse multiplying factor denominator)
1
1 to
65535
CAUTION
Incorrect setting may cause unexpectedly fast rotation, resulting injury.
POINT
The electronic gear setting range is
1
50
<
CMX
CDV
< 500.
If the set value is outside this range, noise may be generated during
acceleration/deceleration, or operation may not be performed at the preset
speed and/or acceleration/deceleration time constants.
Always set the electronic gear with servo off state to prevent unexpected
operation due to improper setting.
(1) Concept of electronic gear
The machine can be moved at any multiplication factor to input pulses.
Command
input pulses
Deviation
counter
Value converted to the number of
command input pulses per revolution (FBP)
Servo Motor
Encoder
M
CDV
CMX
FBP conversion
(Note)
Parameter No. PA06 No. PA07
Parameter No. PA05
Note. This process converts the number of the command input pulses required to rotate the servo motor one turn to the value set in
parameter No. PA05.
CMX
CDV
=
parameter No.PA06
parameter No.PA07
The following setting examples are used to explain how to calculate the electronic gear.
POINT
The following specification symbols are required to calculate the electronic gear
Pb
: Ballscrew lead [mm]
1/n : Reduction ratio
0
: Travel per command pulse [mm/pulse]
S : Travel per servo motor revolution [mm/rev]
0
: Angle per pulse [ /pulse]
: Angle per revolution [ /rev]