
FANUC AC SPINDLE MOTOR a series
2. FUNCTION EXPLANATION
B–65160E/02
100
(2) Observing data used for adjustment
In rigid tapping, adjust the parameters while observing the motor
speed, torque command, velocity deviation, synchronization
error, and other data by using a spindle check board and
oscilloscope. The table below lists spindle check board settings
for observing the data.
Check board setting address
Output to CH1 Output to CH2
Setting Output signal
d–05 d–09 25 Velocity deviation
d–06 d–10 12
"128 min
–1
at "5 V
"256 min
–1
at "5 V if d–06 (d–10) is set to 13
d–07 d–11 0
256 min at
5 V if d–06 (d–10) is set to 13
d–08 d–12 1
d–05 d–09 90 Torque command
d–06 d–10 7
Maximum positive/negative torque command at "5 V
Maximum positive/negative torque command at "2.5 V if d–06
d–07 d–11 0
Maximum positive/negative torque command at
2.5 V if d–06
(d–10) is set to 8
d–08 d–12 1
d–05 d–09 68 Synchronization error (value converted for the spindle:
d–06 d–10 0
4096 pulses/rev)(*1)
"128 pulses at "5 V
d–07 d–11 0
128 pulses at
5 V
"256 pulses at "5 V if d–06 (d–10) is set to 1
d–08 d–12 1
"512 pulses at "5 V if d–06 (d–10) is set to 2
d–05 d–09 19 Motor speed
d–06 d–10 18
"8192 min
–1
at "5 V
"4096 min
–1
at "5 V if d–06 (d–10) is set to 17
d–07 d–11 0
4096 min at
5 V if d–06 (d–10) is set to 17
"2048 min
–1
at "5 V if d–06 (d–10) is set to 16
d–08 d–12 1
*1 When observing the synchronization error of Series 16i/16, set the following parameters:
No. 3700, #7 = 1 : Uses the synchronization error output (maintenance function).
(Return the setting to 0 after the observation is completed.)
No. 5203, #7 = 1 : Sets a synchronization error update cycle.
(Return the setting to 0 after the observation is completed.)
No. 5204, #0 = 0 : Displays the synchronization error on the diagnosis screen.
(3) Adjustment procedure
1. Specifying an acceleration/deceleration time constant (1):
Specifying a provisional value
Before optimizing the acceleration/deceleration time constant,
adjust the gain to improve the response. Following (a) or (b)
below, specify a provisional acceleration/deceleration time
constant according to the target maximum speed.
(a) Specifying a provisional time constant according to the velocity
waveform in actual acceleration/deceleration
Observe the motor velocity waveform (velocity control mode) in
acceleration up to the maximum rigid tapping speed. Specify
such a provisional time constant that the inclination
(acceleration) during rigid tapping acceleration becomes about a
half of the inclination of a tangent to the motor velocity waveform
near the location of maximum speed. See the sample waveform
shown below.