4-12
4-2 Wiring
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
   4
System Design
Main Circuit and Motor Connections
When wiring the main circuit, use proper wire sizes, grounding systems, and noise resistance.
R88D-KNA5L-ECT-R/-KN01L-ECT-R/-KN02L-ECT-R/-KN04L-ECT-R/
R88D-KN01H-ECT-R/-KN02H-ECT-R/-KN04H-ECT-R/-KN08H-ECT-R/
R88-KN10H-ECT-R/-KN15H-ECT-R
Main Circuit Connector Specifications (CNA)
Motor Connector Specifications (CNB)
Sym-
bol
Name Function
L1
Main circuit power supply 
input
R88D-KN@L-ECT-R
50 to 400 W : Single-phase 100 to 120 VAC (85 to 132 V) 50/60 Hz
200 to 400 W: 3-phase 100 to 120 VAC (85 to 132 V) 50/60 Hz
R88D-KN@H-ECT-R
100 W to 1.5 kW : Single-phase 200 to 240 VAC (170 to 264 V) 50/
60 Hz
100 W to 1.5 kW: 3-phase 200 to 240 VAC (170 to 264 V) 50/60 Hz
L2
L3
L1C
Control circuit power 
supply input
R88D-KN@L-ECT-R :
Single-phase 100 to 120 VAC (85 to 132 V) 50/60Hz
R88D-KN@H-ECT-R :
Single-phase 200 to 240 VAC (170 to 264 V) 50/60 Hz
L2C
Sym-
bol
Name Function
B1 
External Regeneration 
Resistor connection 
terminals
R88D-KNA5L-ECT-R/-KN01L-ECT-R/-KN02L-ECT-R/-KN01H-
ECT-R/-KN02H-ECT-R/-KN04H-ECT-R:
Normally, do not short B1 and B2. Doing so may result in 
malfunctioning. If there is high regenerative energy, connect an 
External Regeneration Resistor between B1 and B2.
R88D-KN04L-ECT-R/-KN08H-ECT-R/-KN10H-ECT-R/-KN15H-
ECT-R:
Normally B2 and B3 are shorted. Do not short B1 and B2. Doing so 
may result in malfunctioning. If there is high regenerative energy, 
remove the short bar between B2 and B3 and connect an External 
Regeneration Resistor between B1 and B2.
B3
B2
U
Motor connection 
terminals
Red These are the output terminals to the Servomotor.
Be sure to wire them correctly.
VWhite
WBlue
Green/
Yellow
Frame ground This is the ground terminal. Ground to 100 Ω or less.