
10. INTERFACE SIGNALS
B–65162E/03
382
D Example of the sequence
Motor speed
Motor power
Zero speed detection signal, SSTA
Motor power off signal, MPOFA
Operation mode such as SFRA
0 min
–1
Free run
ON
OFF
1
0
1
0
ON
OFF
D Setting bit 2 of parameter 4069 (FS16) to 1 cuts off the power of the
motor as soon as the AL-24 spindle alarm (serially transmitted data
error) occurs. The motor usually decelerates and stops when the alarm
occurs.
(1) This signal is used when it is necessary to disconnect a spindle
amplifier from a spindle motor temporarily.
SPM
JY4
JY2
Feedback
signal
Power line
Motor
Position coder
Feedback
signal
(2) Using this signal enables preventing a motor overheat or feedback
signal disconnection alarm condition when the feedback signal is
disconnected.
(3) Before the power line is disconnected, the motor excitation off
affirmation (EXOFA) signal can be used to check that the motor is not
energized.
(4) Before disconnecting the feedback signal and power line, set all of the
SFRA, SRVA, ORCMA, MRDYA, and *ESPA commands to 0, and
check that the EXOFA signal is 1, then set this signal to 1. After
reconnection is completed, reset the signal to 0.
10.2.18
Disconnection
Annulment Signal
(DSCNA)