3 Wiring and Connections
26 SD780 Series Servo Technical Manual
3 Wiring and Connections
3.1 Main Circuit Wiring
L1
L2
L3
L
1C
L
2C
B1
B2
B3
U
V
W
+
/
3.1.1 Terminals Description
Pin No.
Signal name
Functions
1
L1 (R/L)
Main circuit power input
2
L2 (S/N)
Main circuit power input
3
L3 (T)
Main circuit power input
4
L1C
Control circuit power input
5
L2C
Control circuit power input
6
B1/+
Positive of Internal and external braking resistor Pins/ DC
power supply fter rectification
7
B2(PB)
Energy-consumption braking output
8
B3
Pin of internal braking resistor
9
-
Negative of DC power supply
10
U
Motor power U phase
11
V
Motor power V phase
12
W
Motor power W phase
Casing
Grounding
Safely grounding
Cautions
！
A volume drive main circuit wiring can only be connected to a single phase (two terminals are provided),
and there is no built- in brake electronics, please pay attention to the correct wiring according to the
wiring label when wiring.
