Electronic Gear Function - Mitsubishi Electric MELSEC iQ-F Series FX5 User Manual

Setting method
To use Backlash compensation function, set Backlash compensation amount in the parameters shown in the following table
and write them to the positioning module.
The settings are validated at the rising edge (when turned off and on) of [Cd.190] PLC READY signal.
Setting item
[Pr.11] Backlash compensation
amount
For details on the settings, refer to the following.
Page 383 [Pr.11] Backlash compensation amount
• Parameters are set for each axis.
• Setting the parameters using GX Works3 is recommended. To perform the setting using programs, many
programs and devices are required. The execution becomes complicated, and the scan times will increase.

Electronic gear function

This function adjusts the pulses calculated and output according to the parameters set in the positioning module with the
actual machine movement amount.
Electronic gear function is classified into the following four functions.
• The function converts the command value (speed, movement amount from the start point to the end point) set in mm units
into pulse units and determines the pulse frequency and number of the command pulses.
Command value
CPU module,
GX Works3
Setting values in different units*1
Speed: V
Amount of movement: L
*1 Unit specified with [Pr.1] Unit setting (mm, inch, degree, or pulse)
• If values less than one pulse are generated by converting the movement amount from the start point to the end point in
units of pulses, values less than one pulse are not output and the machine stops at the front side of the positioning
direction. The values less than one pulse that are not output are accumulated in the positioning module. When the total
cumulative value has reached one pulse or more, one pulse is output.
• When the machine OPR is completed, when the current value change is completed, when the speed control is started
(excluding when the current feed value change is enabled), or when the fixed-feed control is started, the function clears the
cumulative values less than one pulse which could not be output to 0. (If the cumulative value is cleared, an error will occur
for the cleared amount in the machine feed value. Control can be constantly performed with the same machine movement
amount even when the fixed-feed control is continued.)
• The function compensates the machine system error of the command movement amount and actual movement amount by
adjusting Movement amount per pulse. (The value of Movement amount per pulse is defined using [Pr.2] No. of pulses per
rotation, [Pr.3] Movement amount per rotation, and [Pr.4] Unit magnification.)
• The positioning module automatically performs the processing other than the error compensation.
Setting Setting detail
value
→ Set the backlash compensation amount.
Command pulses
Positioning module
Electronic
gear
Speed: Frequency
Amount of movement:
Number of pulses
Initial value Buffer memory address
at the
Axis 1
factory
0 17
12 CONTROL SUB FUNCTION
12.3 Function to Compensate Control
Axis 2
167
12
219