3 BASIC FUNCTION
3.10 Electronic gear function [A]
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3
3.10
Electronic gear function [A]
Electronic gear function is a function that multiplies the electronic gear ratio to the position command, and sets the ratio of the
rotation amount/travel distance of the servo motor to the rotation amount/travel distance of the command unit as desired. For
the position feedback, the inverse number of the electronic gear ratio is multiplied.
• Set the electronic gear within the range of conditions. If a value out of the range is set, [AL. 037 Parameter
error] occurs.
Precautions
• To prevent unexpected operation, set the electronic gear correctly.
• In the position control mode, ensure that the electronic gear is in servo-off status before setting the gear so as to prevent
unexpected operation due to incorrect setting.
• If an excessive command pulse frequency is inputted from the controller in the position control mode, [AL. 031 Overspeed]
may occur, depending on the value of the electronic gear ratio.
Setting method
Setting with servo parameters
Set the electronic gear numerator for [Pr. PA06 Electronic gear - Numerator], and electronic gear denominator for [Pr. PA07
Electronic gear - Denominator]. When using the electronic gear in the command input pulses per revolution, set [Pr. PA05
Number of command input pulses per revolution]. Set the servo parameter of the electronic gear and the electronic gear
setting compatibility mode to be used in "Electronic gear compatibility selection" of [Pr. PA21].
Servo
parameter
Symbol
Name
Outline
PA05
*FBP
Number of command input pulses
per revolution
Set the number of command input pulses per revolution.
Initial value: 10000 [pulse]
PA06
CMX
Electronic gear - Numerator
Set the electronic gear numerator.
Initial value: 1
PA07
CDV
Electronic gear - Denominator
Set the electronic gear denominator.
Initial value: 1
PA21.3
*AOP3
Electronic gear compatibility
selection
Select the electronic gear, and set the electronic gear setting compatibility mode.
0: Electronic gear (initial value)
1: Number of command input pulses per revolution
2: J3 electronic gear setting value compatibility mode
3: J2S electronic gear setting value compatibility mode
4: J4 electronic gear setting value compatibility mode
PC32
CMX2
Command input pulse
multiplication numerator 2
Set the electronic gear numerator at switching with CM1 (Electronic gear selection 1)
and CM2 (Electronic gear selection 2) of the input device.
Initial value: 1
PC33
CMX3
Command input pulse
multiplication numerator 3
PC34
CMX4
Command input pulse
multiplication numerator 4
+
-
M
Deviation counter
Servo motor
Encoder
Electronic gear
reverse conversion
Electronic gear
conversion
Position command
[Command unit]
Position feedback
[Command unit]