Electronic Gear Function; Control Details - Mitsubishi Electric MELSEC Q Series User Manual

10 FUNCTION DETAILS

10.2 Electronic Gear Function

10.2.1 Control details

This function is used to adjust the position command units at positioning command to
QD74MH. The machine can be moved using an arbitrary multiplication constant for
the movement amount by changing the electronic gear.
The position in which the value of an electronic gear is multiplied by the command
value to the QD74MH are output to the servo amplifier.
The electronic gear is shown by the following expression.
Electronic gear numerator (AP)
Electronic gear =
Electronic gear denominator (AL)
POINT
The setting range of the electronic gear is "1/12<AP/AL<10000".
An "error code 1037" will occur, and the unit READY does not turn ON if the
electronic gear is "1/12" or less.
(1) Setting example when the command unit is [μm] for a machine that uses ball
screws
(a) Machine specifications
Ball screw lead
Reduction ratio
Encoder resolution : Pt = 262144[PLS/rev]
AP Pt
AL = S = n × Pb =
(Note): S is the movement amount for 1 revolution of the servomotor.
Servomotor
Encoder resolution
Pt=262144
: Pb = 10[mm] = 10000[μm]
: n = 1/2
Pt 262144 262144
= 5000 =
1
2 × 10000
Deceleration ratio n=1/2
10 - 3
MELSEC-Q
32768
625
Ball screw lead Pb=10[mm]