
B–63010EN/02
4. DESCRIPTION OF PARAMETERS
233
4912
Spindle speed fluctuation ratio (r) for which no alarm is activated in the
spindle speed fluctuation detection function
[Data type] Word
Unit of data 1% 0. 1% (T series)
Data range 1 to 100 1 to 1000
NOTE
Unit of data depends on parameter No.4900#0 FLR (T
series only).
Set the spindle speed fluctuation ratio (r) for which no alarm is activated in
the spindle speed fluctuation detection function (see Fig.4.23 (e)).
4913
Spindle speed fluctuation value (d) for which no alarm is activated in the
spindle speed fluctuation detection function
[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
Actual speed
Alarm
Time
Check
start
Command
another
speed
Check
Check
Sm
Sm
Sd
Sd
Fig.4.23 (e) Sd and Sm
[Unit of data]
[Valid data range]