
B-65280EN/05 FANUC AC SPINDLE MOTOR αi series 3.I/O SIGNALS (CNC ↔ PMC)
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(p) Disconnection detection disable signal (DSCNA)
(1) This signal is used when the connection between the spindle
amplifier and spindle motor needs to be disconnected
temporarily.
SPM
JYA3
JYA2
Feedback
Feedback
Power line
Motor
Position coder
(2) When this signal is used to detach the feedback signal, motor
overheat and the issuance of a feedback signal disconnection
alarm can be prevented.
(3) A motor excitation OFF state confirmation signal (EXOFA) is
provided to confirm that the motor is not excited before the
connected power line is detached.
(4) Before setting this signal to 1 and disconnecting the feedback
signals and power line, set all the SFRA, SRVA, ORCMA,
MRDYA, and *ESPA commands to 0, and confirm that the
motor excitation OFF state confirmation signal (EXOFA) has
been set to 1. After completing re-connection, reset this signal to
0.
(5) Sample sequence
Motor speed
0 min
-
0
1 SFRA,SRVA,ORCMA,
MRDYA,*ESPA
SSTA
0
1
0
1
EXOFA
0
1
DSCNA
Connection
status
Connection
Disconnection
Disconnected
(q) Differential speed mode command signal (DEFMDA)
For details of this signal, see Section 5.9, "DIFFERENTIAL
SPINDLE SPEED CONTROL" in Part I.
(r) Tandem operation command (SLVA)
For details of this signal, see Section 5.11, "TORQUE TANDEM
CONTROL FUNCTION" in Part I.