4-16
4-2 Wiring
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type) 
   4
System Design
Control Circuit Connector Specifications (CNC)
External Regeneration Resistor Connector Specifications (CND)
R88D-KN30F/-KN50F-ML2
Terminal Block Specifications (TB1)
Symbol
Name Function
24 V Control circuit power 
supply input
24 VDC (21.6 to 26.4 V)
0 V
Symbol
Name Function
B1 External Regeneration 
Resistor connection 
terminals
Normally B2 and B3 are connected. Do not short B1 and B2. 
Doing so may cause malfunctions.
If there is high regenerative energy, remove the short-circuit bar 
between B2 and B3 and connect an External Regeneration
Resistor between B1 and B2.
B2
B3
N
Symbol
Name Function
L1
Main circuit power supply 
input
R88D-KNxF-ML2 (3 to 5 kW): 3-phase 380 to 480 VAC (323 to 528 
V) 50/60 Hz
L2
L3
B1 External Regeneration 
Resistor connection 
terminals
A Regeneration Resistor is not built in.
Connect an External Regeneration Resistor between B1 and B2, if 
necessary.
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  or less.
NC  Do not connect.
24 V
 Control circuit power 
supply input
R88D-KNxF-ML2: 24 VDC (21.6 to 26.4 V)
0 V
Frame ground This is the ground terminal. Ground to 10  or less.
NC  Do not connect.