Spindle Coil Changeover - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual
2 Wiring and Connection

2.7.3 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 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 SP028. 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 SP029 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.
Spindle motor speed
Speed detection (SD1)
L coil selection command (LCS)
Changing coil (MKC)
Contactor changeover
【#13028】 SP028 SDTS Speed detection set value
Set the motor speed for detecting the speed.
If the motor speed drops below the set speed, the speed detection signal turns ON.
The standard setting is 10% of the maximum motor speed.
---Setting range---
10 to 32767 (r/min)
【#13029】 SP029 SDTR Speed detection reset width
Set the hysteresis width in which the speed detection changes from ON to OFF.
If the setting value is small, the speed detection will chatter easily.
The standard setting is "30".
---Setting range---
10 to 1000 (r/min)
6000
4000
(r/min)
2000
0
→
[SP NC]
[NC SP] →
→
[SP NC]
Low-speed coil
Spindle motor coil changeover control
93
(SP028+SP029)
High-speed coil
SP028
Time
Low- speed coil
IB-1501229-F