
4.CONNECTIONS FANUC AC SPINDLE MOTOR αiL SERIES B-65272EN/04
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4.1 TOTAL CONNECTION DIAGRAM
PMC
CNC
AC spindle
motor
Switching unit
Spindle
amplifier
module(SPMi)
200 VAC, single phase
RELAY
SOCKET(5)
Magnetic contactor
for power wire
switchin
MCC1(42)
RYS(8)
JA7BA +24V
JYA2
U1
V1
W
U2
V2
W
U
V
W
G
U
V
W
PE
MCC1
MCC2
U1
V1
W1
G
U2
V2
W2
NOTE
1 The machine tool builder is requested to prepare
cables for any equipment other than the spindle
amplifier module, switching unit, or AC spindle
motor, which are enclosed within the heavy-line
frame.
2 Refer to FANUC SERVO AMPLIFIER αi series
DESCRIPTIONS (B-65282EN) for explanations
about the switching unit and the low-/high-speed
winding switching sequence.
3 The power wire switching method is Y-Y switching.
4 The relationships between the magnetic contactor in
the switching unit and the winding state are listed
below:
State MCC1 MCC2
Low-speed winding ON OFF
High-speed winding OFF ON