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FANUC Series 0i-MODEL F Plus. CONNECTION MANUAL (FUNCTION) - page 227

10. SPINDLE SPEED FUNCTION

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Option configuration

Number of pitch error

compensation points

Pitch error

compensation range

Stored type pitch error compensation + bi-directional pitch

error compensation

3072

0 to 1535
3000 to 4535 (Note)

NOTE

Such a setting that the data of one axis extends beyond a pitch error
compensation range is prohibited.

Example) A setting that extends from 1535 to 3000 is prohibited.

10.19

SPINDLE SPEED FLUCTUATION DETECTION

Overview

With this function, an overheat alarm OH0704, "OVERHEAT:SPINDLE" is raised and the spindle speed
fluctuation detection alarm signal SPAL is issued when the spindle speed deviates from the specified
speed due to machine conditions.
This function is useful, for example, for preventing the seizure of the guide bushing.
G26 enables spindle speed fluctuation detection.
G25 disables spindle speed fluctuation detection.

Explanation

The function for detecting spindle speed fluctuation checks whether the actual speed varies for the
specified speed or not. Si or Sr, whichever is greater, is taken as the allowable fluctuation speed (Sm). An
alarm OH0704 "OVERHEAT:SPINDLE" 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).

|Sc – Sa| > Sm

Sc :  Specified spindle speed
Sa :  Actual spindle speed
Si :  The allowable constant variation width which is independent of the specified spindle speed

(parameter No.4913)

Sr : The allowable variation width which is obtained by multiplying Sc (commanded spindle speed)

by r (constant ratio) (r = parameter No.4912)

Bit 0 (FLR) of parameter No. 4900 = 0

Bit 0 (FLR) of parameter No. 4900 = 1

100

1000

Sm: Si or Sr, whichever is greater

Conditions to start spindle speed fluctuation detection

If the specified spindle speed Sc changes, spindle speed fluctuation detection starts when one of the
conditions below is met.
If bit 7 (FDTs) of parameter No.4900 is 1, spindle speed fluctuation detection starts when condition (2) is
met.

(1) The actual spindle speed falls in a range of (Sc - Sq) to (Sc + Sq)

Sc : Specified spindle speed
Sq : Tolerance within which the spindle is assumed to attain the programmed speed

(parameter No.4911)

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Bit 0 (FLR) of parameter No. 4900= 0

Bit 0 (FLR) of parameter No. 4900= 1

100

1000

(2) When time p specified in parameter No.4914 elapses after the specified speed Sc changes.

Examples of spindle speed fluctuation detection

(Example 1)

When an alarm OH0704 is issued after a specified spindle speed is reached

Spindle
speed

Specified
speed

Actual
speed

Time

Alarm

Start of check

Specification of
another speed

CHECK

NO CHECK

CHECK

G26 mode

(Example 2)

When an alarm OH0704 is issued before a specified spindle speed is reached

Spindle
speed

Specified
speed

Actual
speed

Time

Alarm

Start of
check

Specification of
another speed

CHECK

NO CHECK

CHECK

G26 mode

Specified speed : (Speed specified by address S and five-digit value)

(spindle override)

Actual speed

: Speed detected with a position coder

p : Period after a change occurs in the actual spindle speed until detection starts

Parameter No.4914, address P

Sq : (Specified spindle speed)

(Detection start tolerance (q))

Parameter No.4911, address Q

Bit 0 (FLR) of parameter No. 4900 = 0

Bit 0 (FLR) of parameter No. 4900 = 1

100

1000

10. SPINDLE SPEED FUNCTION

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Sr : (Specified spindle speed)

(Allowable variation (r))

Parameter No.4912, address R

Bit 0 (FLR) of parameter No. 4900 = 0

Bit 0 (FLR) of parameter No. 4900 = 1

100

1000

Si : Allowable variation width

Parameter No.4913, address I

If the difference between the specified speed and actual speed exceeds both Sr and Si, an alarm OH0704
is raised.

Relationship between spindle speed control and each spindle

Spindle

Function

Serial spindle

1st spindle

2nd spindle

3rd spindle

4th spindle

Spindle speed fluctuation detection

Possible

(*1)

Possible

(*1)

Possible

(*1)

Spindle

Function

Analog spindle

1st spindle

Spindle speed fluctuation detection

Possible

NOTE

1 Please enable the multi spindle control (bit 3 (MSP) of parameter No.8133 is 1).
2 The spindle speed fluctuation detection function is effective for a single spindle.

The function cannot be executed for two or more spindles.

The spindle speed fluctuation detection function is effective for a spindle on
which the currently selected position coder is mounted. Just a single position
coder can be selected. Multiple position coders cannot be selected. For the
selection of a position coder, see the section of "Multi-spindle control."
* Position coder selection signals (PC2SLC<Gn028.7>, PC3SLC<Gn026.0>,

PC4SLC<Gn026.1>)

3 The parameters that become valid are the parameters of the spindle speed

fluctuation detection function (No.4911, No.4912, No.4913, No.4914) for the
spindle on which the currently selected position coder is mounted.

Spindle that can be subjected to the spindle speed fluctuation detection
function, depending on the relationship between system configuration and
spindle

The table below show some examples explaining the spindle to be subjected to the spindle speed
fluctuation detection function, depending on the system configuration and spindle assignment.

NOTE

1 If path control is performed, the spindle speed fluctuation detection function is

carried out for the axis on which the currently selected position coder is
mounted.
* Position coder selection signals (PC2SLC<Gn028.7>, PC3SLC<Gn026.0>,

PC4SLC<Gn026.1>)

2 Under multi-path control, if the feedback pulse of a position coder mounted on a

spindle belonging to a path is used, the selected path feedback must be
considered in addition to the selection of the position coder. Great attention
should be given to the selection statuses of relative signals.
* Path spindle feedback selection signals (SLPCA<Gn064.2>,

SLPCB<Gn064.3>, SLPCC<Gn403.4>, SLPCD<Gn403.5>)

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NOTE

3 It is assumed that the reader has understood the individual functions described

in this manual. If necessary, see the sections of "spindle control for each path,"
"spindle control," and "multi-spindle control."

Examples of spindles subjected to detection

- Specified spindle

Indicates which path is specifying which spindle.

- Feedback pulse

Indicates the contents of the feedback pulse to be used, depending on a selected
position coder.

- Feedback subjected

to detection

Indicates the feedback subjected to the spindle speed fluctuation detection function.

- G26

Indicates whether the spindle speed fluctuation detection function is enabled in
which path.

- Detection

Indicates whether spindle speed fluctuation detection is possible in which path.

System

configuration

Path

Specified spindle

Feedback pulse

Feedback
subjected

detection

G26

(Multi-path)

Detection

Single path control +
Non-multi-spindle
control +1 spindle

―

Address S

1st spindle Feedback

1st spindle PC1

○

Single path control +
Multi-spindle control
+
4 spindles

―

Address S

1st spindle

2nd spindle

3rd spindle
4th spindle

Feedback

1st spindle PC1
2nd spindle PC2
3rd spindle PC3
4th spindle PC4

(selected)

×
×
×

○

Multi-path control +
Non-multi-spindle
control +

Signal of spindle control for each path: Type A (*1.)

Path 1

Address S

1st spindle Feedback

1st spindle PC1

○

Path 2

Feedback

―

○

Signal of spindle control for each path: Type A (*1.)

Path 1

Address S

1st spindle Feedback

1st spindle PC1

○

Path 2

Feedback

―

○

Multi-path control +
Multi-spindle control
+
2 spindles per path

Signal of spindle control for each path: Type C (*2.)

Path 1

Address S

1st spindle

Feedback

1st spindle PC1
(selected)

○

2nd spindle

2nd spindle PC2

Path 2

Address S

1st spindle

Feedback

1st spindle PC1

2nd spindle

2nd spindle PC2
(selected)

○

Signal of spindle control for each path: Type C (*3.)

Path 1

Address S

1st spindle

Feedback

1st spindle PC1
(selected)

○

2nd spindle

2nd spindle PC2

Path 2

1st spindle

Feedback

1st spindle PC1

○

2nd spindle

2nd spindle PC2
(selected)

*1 The feedback pulse can be obtained from path 1 in this example.
*2 The signals for selecting spindle feedback of each path (SLPCA<Gn064.2>, SLPCB<Gn064.3>,

SLPCC<Gn403.4>, SLPCD<Gn403.5>) are set to select feedback in each path, for both path 1 and
path 2.

*3 The signals for selecting spindle feedback of each path (SLPCA<Gn064.2>, SLPCB<Gn064.3>,

SLPCC<Gn403.4>, SLPCD<Gn403.5>) are set to select the feedback pulse of path 1 for path 2.

10. SPINDLE SPEED FUNCTION

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Spindle
specified

Spindle
FB

1st spindle
command

Spindle PC1

*SSTP1#1

*SSTP2#1

*SSTP3#1

*SSTP4#1

2nd spindle
command

Spindle PC2

3rd spindle
command

Spindle PC3

4th spindle
command

Spindle PC4

PC2SLC#1

PC3SLC#1

PC4SLC#1

ＰＣ１

ＰＣ２

ＰＣ３

ＰＣ４

Position coder selection (1 PC selectable)

SWS3#1

SWS2#1

SWS4#1

SWS1#1

*SSTP#1

SOV#1

＜＞

G26

This feedback is
subjected to spindle
speed fluctuation
detection.

System controlling four spindles by one path

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Spindle
specified

Spindle
FB

*SSTP#2

SOV#2

＜＞

G26

This feedback is
subjected to spindle
speed fluctuation
detection.

Spindle
specified

Spindle
FB

1st spindle
command

Spindle PC1

*SSTP#1

SOV#1

＜＞

G26

SLSPA #1

System controlling one spindle by two paths

10. SPINDLE SPEED FUNCTION

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Sharing a spindle between different paths

Spindle
specified

Spindle FB

*SSTP#1

SOV#1

＜＞

G26

Path 1

SLSPA

～

D#1

～

1st spindle
command

Spindle PC1

*SSTP1#1

*SSTP2#1

2nd spindle
command

Spindle PC2

SWS2#1

SWS1#1

SLPCA

～

D#1

～

PC2SLC#1

PC3SLC#1

PC4SLC#1

ＰＣ１

ＰＣ２

ＰＣ３

ＰＣ４

Position coder selection (1 PC selectable)

This feedback is
subjected to spindle
speed fluctuation
detection.

Spindle
specified

Spindle FB

G26

Path 2

SLSPA

～

D#2

～

1st spindle
command

Spindle PC1

*SSTP1#2

*SSTP2#2

SWS2#2

SWS1#2

SLPCA

～

D#2

～

PC2SLC#2

PC3SLC#2

PC4SLC#2

ＰＣ１

ＰＣ２

ＰＣ３

ＰＣ４

Position coder selection (1 PC selectable)

*SSTP#2

SOV#2

＜＞

2nd spindle
command

Spindle PC2

Sharing a spindle between different paths

About spindle speed fluctuation detection at power-on or cleared state

At power-on or cleared state, G25 mode (spindle speed fluctuation detection is disabled) is usually
selected. If bit 0 (G26) of parameter No.4902 is set to 1, G26 mode (spindle speed fluctuation detection is
enabled) is selected.
Placing the G25/G26 group in the cleared state requires the following parameter settings:
-

Bit 6 (CLR) of parameter No. 3402 is set to 1

Bit 0 (C08) of parameter No. 3407 is set to 1 (T series) / Bit 3 (C19) of parameter No. 3408 is set to

1 (M series)

About these parameters and G25/G26 mode state at power-on or reset, refer to following.

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G26(No.4902#0)

CLR(No.3402#6)

(T series)

C08(No.3407#0)

(M series)

C19(No.3408#3)

At power-on

At reset

in G25 mode

At reset

in G26 mode

G25

G26

G25

G26

G25

G26

G25

G26

G25

G26

G25

G26

Parameters of spindle speed fluctuation detection at power-on

At power-on if bit 6 (UDPs) of parameter No.4900 is set to 1, parameters Nos. 4921 to 4924 (dp, dq, dr,
di) are valid and parameters Nos. 4911 to 4914 (p, q, r, i) are invalid. Because of specified address P, Q,
R, I in the machining program, value of parameters Nos. 4911 to 4914 (p, q, r, i) are changed and value of
parameters Nos. 4921 to 4924 (dp, dq, dr, di) are not changed. So, parameters Nos. 4921 to 4924 (dp, dq,
dr, di)are used as default parameter at power-on.

When parameters Nos. 4921 to 4924 (dp, dq, dr, di) are valid, if address P, Q, R, I are specified in the
machining program even once as following,

G26 Pp Qq Rr Ii ;
the specified values are set for parameters Nos. 4911 to 4914 (p, q, r, i) and these parameters are valid as
parameters of spindle speed fluctuation detection. If address P, Q, R, I are not specified in the machining
program, parameters Nos. 4921 to 4924 (dp, dq, dr, di) are still valid. Examples of valid spindle speed
fluctuation detection parameters are shown below.

At cleared state, G25 / G26 mode changes according to parameter bit 0 (G26) of parameter No.4902, but
valid parameters of spindle speed fluctuation detection don’t change. And, When mode is change into

G25 mode

G26 mode

○

Current mode and valid parameters

G26 Pp Qq Rr Ii ;

machining program

G25 mode

○

G26 mode

○

(Example 1)

G25 mode

G26 mode

○

G26 Rr Ii ;

G25 mode

○

G26 mode

○

(Example 2)

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