
B-65280EN/05 FANUC AC SPINDLE MOTOR αi series 4.ADJUSTMENT
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(5) Preparation for adjustment
With this function, parameters are adjusted by rotating the spindle at a
certain speed in the velocity control mode and observing feedback
data. The measuring devices required for the adjustment and the
settings made at the time of adjustment are explained below.
<1> Measuring devices required for adjustment
For the adjustment by this function, a spindle check board
(A06B-6078-H001) and a digital oscilloscope having an
averaging function are required.
<2> Speed and rotation direction at adjustment time
For adjustment on the motor sensor side, issue a speed command
and rotation direction command (SFR or SRV) so that the motor
rotates in the forward direction (counterclockwise) at speed N
(see the equation below). For adjustment on the spindle sensor
side, issue the commands so that the spindle rotates in the
forward direction (counterclockwise) at speed N.
N [min
-1
] = 4685/Number of sensor gear teeth [λ/rev]
Example: When the number of sensor gear teeth = 256 [λ/rev]
N = 4685/256 = approx.18 [min
-1
]
<3> Setting observation data
The table given below lists the data items to be observed at the
time of adjustment and the settings for output on the spindle
check board. For adjustment on the motor sensor (JYA2) side,
observe data with data Nos. 313 and 231. For adjustment on the
spindle sensor (JYA4) side, observe data with data Nos. 314 and
232.
Channel Setting address Setting data Description
313 Motor sensor feedback incremental data
d-05 (data number)
314 Spindle sensor feedback incremental data
d-06 (shift amount) 3 to 5
d-07 (shift direction) 0
CH1
d-08 (offset) 0 or 1
Incremental data sent every 2 ms for feedback data (data Nos. 231
and 232)
The data weights 1/2
4
λ/10V for a shift amount of 4
231 Motor sensor feedback data
d-09 (data number)
232 Spindle sensor feedback data
d-10 (Shift amount) 8
d-11 (shift direction) 0
CH2
d-12 (offset) 0
The data weights 1λ/10V.
During rotation, a saw tooth wave form is observed, and the edge
interval is equivalent to data for 1λ of the sensor gear.
<4> Setting the oscilloscope
Connect and set the oscilloscope as shown below to observe data.
Use a falling edge of feedback data as a trigger, observe a
waveform which averages incremental data, and adjust
parameters so that the amplitude of this waveform is minimized.
Channel 1: Connected to the CH1 pin of the check board (0.5 to
1 V/div)
Channel 2: Connected to the CH2 pin of the check board (5
V/div)
Measurement time range: 5 to 10 ms/div
Trigger setting: Falling edge of channel 2
Number of averaging times: About 16 to 64 times