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CHAPTER 11 CONTROL SUB FUNCTIONS
11
11.1 Electronic Gear Function
11.1 Electronic Gear Function
The "electronic gear function" controls machine movement amount per one command pulse by multiplying command
pulse output of the QD73A1.
Positioning is much more flexible with the use of this function, eliminating the process of selecting a detector according
to the machine system.
(1) Details of the electronic gear function
Machine movement amount per one pulse is adjusted inside the QD73A1.
Electronic gear is active on all of OPR control, major positioning control, and JOG operation.
Set numerator and denominator of command pulse multiplication for electronic gear to parameters.
Satisfy the following condition when setting a numerator (CMX) and a denominator (CDV).
If the setting range is exceeded, the error "Denominator of command pulse multiplication for electronic gear
Outside the setting range" (error code: 3) occurs.
When the electronic gear function is used, positioning speed and movement amount are multiplied by the
specified value.
When there are decimal pulses, the fractions are maintained inside and accumulated for the next command.
The following is an example of the use of electronic gear.
Ex.
A positioning system using the following worm gear
• Worm gear lead: 10mm
• Feedback pulses from the servomotor: 12000pulse/rev
When the electronic gear function is not used, the feed rate (movement amount per pulse) has fractions.
In this system, the fractions can be avoided using the electronic gear function and setting numerator and
denominator as follows: CMX/CDV = 12
Number of
command
pulses
Electronic
gear
Command
pulse
QD73A1
Deviation
counter
D/A
converter
Multiplication
Accumulated pulses
feedback pulse
Drive unit
Speed
command
Servo
amplifier
Analog voltage
CMX
CDV
Setting data
50
50
1
CDV
CMX
==
12000
10
mm/pulse
0.000833
==12 0.01mm/pulse
12000
'
10