4-25
4-2 Wiring
4
System Design
*1. The left value is for single-phase input power, and the right value is for three-phase input power.
*2. Use the same wire sizes for B1 and B2.
*3. Connect an OMRON Servomotor Power Cable to the Servomotor connection terminals.
Wire Sizes and Allowable Current (Reference)
The following table shows the allowable current when there are three power supply wires.
Use a current below these specified values.
600-V Heat-resistant Vinyl Wire (HIV)
Model (R88D-)
GT15H GT20H GT30H GT50H GT75H
Item Unit
Power supply capacity kVA 2.3 3.3 4.5 7.5 11
Main circuit power
supply input
(L1 and L3, or
L1, L2, and L3)
*1
Rated current A 11.0/8.0
*1
10.2 15.2 23.7 35.0
Wire size ---
AWG14
AWG12 AWG10 AWG8
Screw size --- --- M5
Torque N⋅m --- 2.0
Control circuit
power supply input
(L1C and L2C)
Rated current A 0.07 0.1 0.12 0.12 0.14
Wire size --- AWG18
Screw size --- --- M5
Torque N⋅m --- 2.0
Servomotor
connection
terminals (U, V, W,
and GR)
*2
Rated current A 9.4 13.4 18.6 33.0 47.0
Wire size ---
AWG14
AWG12 AWG8 AWG6
Screw size --- --- M5
Torque N⋅m --- 2.0
Frame ground
(GR)
Wire size --- AWG14 AWG12 AWG8
Screw size --- M4 M5
Torque N⋅m 1.2 2.0
AWG size
Nominal
cross-sec-
tional area
(mm
2
)
Configura-
tion (wires/
mm
2
)
Conductive
resistance
(Ω/km)
Allowable current (A) for ambient temperature
30°C 40°C 50°C
20 0.5 19/0.18 39.5 6.6 5.6 4.5
--- 0.75 30/0.18 26.0 8.8 7.0 5.5
18 0.9 37/0.18 24.4 9.0 7.7 6.0
16 1.25 50/0.18 15.6 12.0 11.0 8.5
14 2.0 7/0.6 9.53 23 20 16
12 3.5 7/0.8 5.41 33 29 24
10 5.5 7/1.0 3.47 43 38 31
8 8.0 7/1.2 2.41 55 49 40
6 14.0 7/1.6 1.35 79 70 57
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