
B–65160E/02
1. ADJUSTMENT
FANUC AC SPINDLE MOTOR aC series
253
PCALCH PCLS
6507 3007 3007 4007
6647 3147
1st :
2nt:
1: Not performs disconnection detection
Set this bit to “1” temporarily when adjusting position feedback signal.
After adjustment, reset it to “0”.
PCALCH:
Enables or disables detection of the alarm (AL–41, AL–42, AL–47)
related to the position coder signals.
0: Detects the alarms related to the position coder signal. (Normally
set to “0”)
1: Does not detect the alarms related to the position coder signal.
(3) Setting the detector–related parameter
1. In case of using the position coder
Example of a recommended sequence for shifting gears for a spindle with
a gear shift mechanism
(For the Series 9D12 only)
(Conditions)
D The Series 9D12 ROM is in use.
D The motor speed obtained from the position coder signal is
to be used (bit 0 of parameter 4005 (FS16) = ”1”).
D The spindle has a gear shift mechanism.
(Descriptions)
If gears are shifted during speed control based on the motor speed
obtained from the position coder signal, the gear status of the
machine may fail to match the gear ratio parameter setting,
resulting in speed control being performed based on the wrong
speed data, on which an alarm will be issued. To solve this
problem, insert a torque limit signal when gear shifting is started.
This measure switches speed control to an inferred speed for
smooth gear operation during gear shifting. Parameter 4078
offers a timer that can be used in switching speed control between
the motor speed obtained from the position coder signal and the
inferred speed. Use the timer if needed.
The software internal timer is running.
Torque limit signal
(TLMH)
Control based on the
inferred speed
Control based on the
motor speed obtained
from the position coder signal
Control based on the
motor speed obtained
from the position coder signal