
B-65280EN/05 FANUC AC SPINDLE MOTOR αi series 5.FUNCTION DESCRIPTIONS
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(2)Performing spindle switching by checking only with the power line status
signal (MCFNA) (bit 2 of parameter No. 4014 = 0)
OFF(=1)
MAIN(=0)
MAIN(=0)
SUB(=1)
MAIN(=0)
Closed
Stop
Rotation
ON(=1) OFF(=0)
SUB(=1)
Open Closed
Open
Open (=0) Closed (=1)
Closed Open
Open (=0)
MAIN(=0)
MAIN(=0) SUB(=1)
ON(=1) OFF(=0) ON(=1)
MAIN(=0)
ON(=1) OFF(=0) ON(=1) OFF(=0)
t
1
’
t
1
t
1
<1sec
t
1
’<1sec
Main spindle motor Sub-spindle motor Main spindle motor
Rotation commands (SFRA and
SRVA)
Spindle orientation command
(ORCMA) PMC
→
CNC
Spindle motor speed
Zero-speed signal (SSTA)
CNC
→
CNC
Spindle switching request signal
(SPSLA) PMC
→
CNC
Power line switching signal
(CHPA) CNC
→
PMC
Main spindle motor magnetic
contactor
Spindle switching completion
signal (RCFNA)
CNC
→
PMC
Sub-spindle motor magnetic
contactor
Sub-spindle motor magnetic
contactor status signal
(MCFNA) PMC
→
CNC
NOTE
1 When checking the selection status of magnetic
contactors MCC1 and MCC2 only with the auxiliary
contact of magnetic contactor MCC1, allow a delay
time of at least 50 ms between the instant when
switching between MCC1 and MCC2 is performed
with the power line switching signal (CHPA) and the
instant when the power line status confirmation
signal (MCFN) changes, because a delay occurs in
the operation of the magnetic contactors.
2 SPM alarm 15 is issued unless the power line
magnetic contactor status signal (MCFNA) changes
within one second after the switching request signal
(SPSLA) has changed.