Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual page 465

Precautions
• The acceleration/deceleration processing for when the override ratio is changed during positioning control is performed at
the acceleration/deceleration time set in the parameter block (or positioning data of the servo instruction) at the start.
However when the acceleration/deceleration time change function is valid, acceleration/deceleration processing is
performed at the acceleration/deceleration time set in the acceleration/deceleration time change function. The positioning
controls for which acceleration/deceleration time change is valid are shown below.
• Linear control
• Fixed-pitch feed
• Speed control ()
• Speed control ()
• Speed-position switching control
• Position follow-up control
• Continuous trajectory control (linear control only)
• JOG operation
• When the data set to the override ratio is outside of range, a warning (error code: 09E2H) occurs, and speed is not
changed. (At startup, operation is at 100.0[%] of the program command speed, when running, operation is at the speed
before the change.)
For machine control, a warning (error code: 0EE0H(details code: 00F2H)) occurs.
• At startup, if "[Rq.1122] Speed switching point specified flag (R: M30040/Q: M2040)" is ON and advanced S-curve
acceleration/deceleration is being used, the override function is disabled.
• When the override ratio is changed after performing a speed change request (CHGV) for speed "0", the speed is "0" even
after applying the override to speed "0". Change the override ratio after changing the speed change request (CHGV) to a
speed other than "0".
• For a speed change by override function, "[St.1047] Speed change accepting flag (R: M30144+n/Q: M2061+n)" and
"[St.346] Command generation axis speed change accepting flag (R: M36571+32n/Q: M9811+20n)" do not turn ON.
• When override ratio is set to "0", "[St.1049] Speed change "0" accepting flag (R: M30272+n/Q: M2240+n)" and "[St.347]
Command generation axis speed change "0" accepting flag (R: M36572+32n/Q: M9812+20n)" turn ON. In this case, an
event history is recorded.
• When the speed after "program command speed  override ratio" exceeds the speed limit value, the feed speed is clamped
at the speed limit value and a warning (error code: 0991H) occurs.
For machine control, a warning (error code: 0EE0H(details code: 00F3H)) occurs.
• When the speed after "program command speed  override ratio" is less than bias speed at start, a warning (error code:
0A5DH) occurs and speed is not changed. (At startup, operation is at 100.0[%] of the program command speed, when
running, operation is at the speed before the change.)
• In high-speed oscillation the override is applied to the frequency. There is a possibility of operating at a frequency that
exceeds the frequency set by the program due to the override ratio. When the range for frequency (1 to 5000[CPM) is
exceeded due to the override ratio, a warning (error code: 09E1H) occurs, and frequency is clamped at 5000[CPM].
• Speed is not changed by override ratio after the fixed position stop command is turned ON during speed control with fixed
position stop.
• Speed is not changed by override ratio when override ratio is changed during automatic deceleration, or during stop/rapid
stop.
• The values of "[Md.28] Command speed (R: D32024+48n, D32025+48n/Q: #8004+20n, #8005+20n)" and "[Md.348]
Command generation axis command speed (R: D36492+48n, D36493+48n/Q: D12612+20n, D12613+20n)" are updated
with the value including the override ratio when override is being used.
In machine program operation,"[Md.2083] Machine program operation target speed (D53276+128m, D53277+128m)" is
also updated with the value including the override ratio when override is being used.
• Override is disabled in the output axes of advanced synchronous control.
• Override is disabled in positioning control in test mode.
7 AUXILIARY AND APPLIED FUNCTIONS
7.8 Override Function
7
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