
B--63005EN/02
7. DIGITAL SERVO
527
<<Examples of calculation>>
1/1000 mm 1/10000 mm
One revolution 8mm
of motor 10mm
12mm
n=1/m=125
n=1/m=100
n=3/m=250
n=2/m=25
n=1/m=10
n=3/m=25
(7)Direction of travel
2022 Rotational direction of motor
PRM
111 : Normal (clockwise) --111 : Reverse (counterclockwise)
(8)Number of velocity pulses and position pulses
1) For serial pulse coder A or B, or serial α pulse coder
Increment system : 1/1000mm Increment system : 1/10000mm
aramter
o.
Closed loop Semi --closed loop Closed loop Semi--closed loop
High resolution setting 2000 xxxx xxx 0 xxxx xxx 1
Separate detector 1815 0010 0010 0010 0000 0010 0010 0010 0000
No. of velocity feedback pulses 2023 8192 819
No. of position feedback pulses 2024 NS 12500 NS/10 1250
NOTE
1 NS is the number of position feedback pulses per one
revolu tion of the motor (multiplied by four)
2 The 5--0S to 3--0S motors have different numbers of poles.
Set parameter 2001.
3 Even if the system employs a closed loop, bit 3 of parameter
2002 is 1 and bit 4 is 0.
(9)Reference counter
1821 Reference counter capacity for each axis (0 -- 99999999)
PRM
6. Turn off the power then back on.
(10) FSSB display and setting screen
Connecting the CNC control unit to servo amplifiers via a
high--speed serial bus (FANUC Serial Servo Bus, or FSSB), which
uses only one fiber optics cable, can significantly reduce the amount
of cabling in machine tool electrical sections.
Axis settings are calculated automatically according to the
interrelationships between axes and amplifiers entered on the FSSB
setting screen. Parameter Nos. 1023, 1905, 1910 to 1919, 1936, and
1937 are specified automatically according to the results of the
calculation.
The FSSB setting screen displays FSSB--based amplifier and axis
information. This information can also be specified by the operator.
1. Press function key
SYSTEM
.
2. To display [FSSB], press continuous menu key
several times.
3. Pressing soft key [FSSB] causes the AMP SET screen (or the
previously selected FSSB setting screen) to appear, with the following
soft keys displayed.
D Display