Fanuc Series 15i/150i-MA (Programming) Operators Manual

B-63324EN/03 PROGRAMMING 9.SPINDLE SPEED FUNCTION (S FUNCTION)
- 237 -
Command address Parameter number
Q 5701
R 5702
I 5721
P 5722
If any of the P, Q, R, and I command addresses is omitted, spindle
speed fluctuation detection is performed with the value set in the
corresponding parameter (No. 5071, 5702, 5721, or 5722).
- Disabling spindle speed fluctuation detection
G25;
G25 places the system in spindle speed fluctuation detection disabled
mode.
Specifying G25 does not change the settings of parameters Nos. 5071,
5702, 5721, and 5722.
If G26 (bit 4 of parameter No. 2409) is "0," the system enters spindle
speed fluctuation detection disabled mode (G25) when the power is
turned on or a reset is performed.
Explanation
- Method for detecting spindle speed fluctuation
If a difference between the actual spindle speed and the specified
spindle speed becomes larger than the allowable fluctuation width
specified in the address R and I commands in a G26 command block or
parameter Nos. 5702 and 5721 (if the following two conditions are
satisfied), an alarm is issued to indicate that the fluctuation has become
higher than a permissible level.
(1) |Sc - Sa|>=Sr
(2) |Sc - Sa|>=Si
Sc: Specified spindle speed
Sa: Actual spindle speed
Sr: Spindle speed fluctuation range calculated from spindle speed
fluctuation ratio (address R command in a G26 block or
parameter No. 5702)
If parameter FLR (bit 1 of parameter No. 5808) is 0
Sr = Sc * r / 100
If parameter FLR (bit 1 of parameter No. 5808) is 1
Sr = Sc * r / 1000
Si: Permissible range of fluctuation that does not cause a spindle speed
fluctuation detection alarm to be output (address I command in a
G26 block or parameter (No. 5721) setting)

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