Mitsubishi MELDAS MDS-C1

2. Wiring and Connection
2 - 43
2-10-2 Wiring
A typical Y-∆ changeover control circuit is shown below. The contactors MC1 and MC2 are controlled
with the signal from the spindle drive. When one turns ON, the other turns OFF.
U
V
W
X
Y
Z
U
V
W
MC2
MC1
Spindle motor
Spindle drive
terminal block
MC1: Contactor for Y (star) connection at low-speed regions
MC2: Contactor for
∆
(delta) connection at high-speed regions
Y (star) - ∆ (delta) changeover circuit
Coil changeover relay control circuit
MDS-C1-SP
CN9-8
CN9-8
RA
T
MC1
MC2
SK
SK
S
RA RA
MC1
MC2