Mitsubishi Electric MELSEC iQ-R RD75P4, Руководство пользователя

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7 CONTROL SUB FUNCTIONS
7.3 Function to Compensate Control
Electronic gear function
This function adjusts the pulses calculated and output according to the parameters set in the RD75 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.
*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 RD75. 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 RD75 automatically performs the processing other than the error compensation.
CPU module,
engineering tool
RD75
Setting value (each unit)
*1
Command pulse
Electronic
gear
Speed: V
Movement amount: L
Speed: Frequency
Movement amount: Number
of pulses
Command value