
B-64120EN/01 4.DESCRIPTION OF PARAMETERS
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Spindle speed fluctuation value (d) for which no alarm is activated in the
spindle speed fluctuation detection function
4913
[Data type] Word
[Unit of data] min
-1
[Valid data range] 0 to 32767
Set the allowable fluctuation speed (Sd) for which no alarm is
activated in the spindle speed fluctuation detection function.
The function for detecting spindle speed fluctuation checks whether
the actual speed varies for the specified speed or not. Sd or Sr,
whichever is greater, is taken as the allowable fluctuation speed (Sm).
An alarm is activated when the actual spindle speed varies for the
commanded speed (Sc) under the condition that the variation width
exceeds the allowable variation width (Sm).
Sd: The allowable constant variation width which is independent of
the specified spindle speed (Sd is set with parameter 4913.)
Sr: The allowable variation width which is obtained by multiplying
Sc (commanded spindle speed) by r (constant ratio). (r is set with
parameter 4912.)
Sm: Sd or Sr, whichever is greater
No
check
Spindle speed
Specified
speed
ctual speed
larm
Time
Check
start
Command
another speed
Check
Check
Sm
Sm
Sd
Sd
Fig.4.20 (e) Sd and Sm
4914
Time (p) elapsed from when the commanded spindle speed is changed to the
start of spindle speed fluctuation detection
[Data type] 2-word
[Unit of data] ms
[Valid data range] 0 to 999999
Set the time elapsed from when the specified spindle speed is changed
to the start of spindle speed fluctuation detection in the spindle speed
fluctuation detection function. That is, the fluctuation in the spindle
speed is not detected until the specified time elapses from when the
specified spindle speed is changed.