Filter
Top Products
2. Wiring and Connection
2 - 43
2-7-2 Spindle coil changeover
There are spindle motors capable of coil changeover control, which enables favorable characteristics to
be attained from low speeds to high speeds by changing two types or three types (only for
MDS-C1-SPM) of coils.
(1) Coil changeover control
The speed at which to change the coils is detected by the spindle drive according to the value set
with spindle parameter SP020. This is conveyed to the NC with a speed detection (SD) signal. The
NC judges the other conditions (coil fixed, etc.), and issue a coil changeover command to the
spindle drive with the L coil selection command (LCS).
To prevent the contactor from varying, the hysteresis set with SP047 is applied on the speed when
changing from the low-speed coil to the high-speed coil and the high-speed coil to the low-speed
coil.
Speed detection (SD1) [SP→NC]
L coil selection command (LCS) [NC→SP]
Changing coil (MKC) [SP→NC]
Contactor changeover
0
2000
Time
6000
Spindle motor speed
(r/min)
Low-speed coil
4000
(SP020+SP047
High-speed coil
Low-speed coil
SP020
Spindle motor coil changeover control
No. Abbrev. Parameter name Description Setting range
Standard
value
SP020 SDTS* Speed detection
set value
Set the motor speed of which speed detection 1 output is
performed. Usually, the setting value is 10% of SP017 (TSP).
0 to 32767
(r/min)
600
SP047 SDTR* Speed detection
reset value
Set the reset hysteresis width for a speed detection set value
defined in SP020 (SDTS).
0 to 1000
(r/min)
30