Electronic Gear Function [A]; Setting Method - Mitsubishi Electric MELSERVO-J5 User Manual

3.12

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.
Position command
[Command unit]
Position feedback
[Command unit]
• 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 input 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 in [Pr. PA06 Electronic gear numerator], and electronic gear denominator in [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 Symbol
parameter
PA05 *FBP
PA06 CMX
PA07 CDV
PA21.3 *AOP3
PC32 CMX2
PC33 CMX3
PC34 CMX4
3 BASIC FUNCTION
140
3.12 Electronic gear function [A]
+
Electronic gear
Deviation counter
conversion
-
Electronic gear
reverse conversion
Name
Number of command input
pulses per revolution
Electronic gear numerator
Electronic gear denominator
Electronic gear compatibility
selection
Command input pulse
multiplication numerator 2
Command input pulse
multiplication numerator 3
Command input pulse
multiplication numerator 4
Servo motor
M
Encoder
Outline
Set the number of command input pulses per revolution.
Initial value: 10000 [pulse]
Set the electronic gear numerator.
Initial value: 1
Set the electronic gear denominator.
Initial value: 1
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
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