Mitsubishi Electric MELSEC Q Series User Manual page 79

(2) Numerator of command pulse multiplication for electronic gear,
Pr.3
Denominator of command pulse multiplication for electronic gear
Pr.4
Set the numerator (CMX) and denominator (CDV) of command pulse multiplication for electronic gear.
Setting data
Number of
command
pulses
For details on the electronic gear function, refer to the following.
Page 209, Section 11.1
Remark
● Machine movement amount per one command pulse can be changed using the command pulse multiplication setting.
● Electronic gear is active on all of OPR control, major positioning control, and JOG operation.
● The module operates with the positioning speed and movement amount that are multiplied by the set value for electronic
gear. Satisfy the following condition when setting electronic gear.
Positioning speed × Electronic gear  4Mpulse/s
When the positioning speed value that is multiplied by the set value of electronic gear exceeds "
the limit value is ignored. On the other hand, if the speed exceeds 4Mpulse/s, the error "Outside the command frequency
range" (error code: 104) occurs. In this case, the speed is 4Mpulse/s, resulting in a positioning error.
● When there are decimal pulses, the fractions are maintained inside and accumulated for the next command.
● If positioning is continued after the CPU module was reset, a positioning error by the fractions of pulses occurs due to
electronic gear (when CMX/CDV  1). In that case, execute OPR.
(3) Speed limit value
Pr.5
Set the upper limit speed of major positioning control or JOG operation. If command speed that is faster than this
limit is specified, the speed is limited to this value.
Remark
If speed for OPR control is set to the one faster than "
●
setting range" (error code: 20) occurs at the start of OPR.
● Positioning speed must be limited properly depending on the device and control subject.
● Set a value in a unit of 10 pulses. If a single digit is set, the value is rounded off.
QD73A1
Electronic Deviation
gear counter
Accumulated pulses
Multiplication
Command CMX
pulse
CDV
CHAPTER 5 DATA USED FOR POSITIONING
Speed
command
D/A
converter
Analog voltage
feedback pulse
Speed limit value", the error "OPR speed Outside the
Pr.5
Drive unit
Servo
amplifier
Speed limit value",
Pr.5
77
5