STEP ET Series - The Wire Specifications of Main Circuit Wiring

Chapter 4 Wiring of Inverter
Shanghai Sigriner STEP Electric Co., Ltd.
- 38 -
Terminal No.
Terminal function description
Grounding terminal, connected to the protection ground, ground
resistance can not be greater than 1Ω at 400V class
4.3.3 The wire specifications of main circuit wiring
The conductor uses 600V copper-core plastic insulated wire or similar wires for power supply. Wire
specifications and tightening torque are shown in Table 4-11.
Table 4-11 Wire specifications and tightening torque
Inverter model
Intelligent flexible
driver
Connectable wire
specifications (mm
2
)
Recommended wire
specifications (mm
2
)
Fastening torque
(N.m)
4T4A1
0.75~1.0
0.75
1.2
4T5A6
1.0~1.5
1.0
1.2
4T7A2
1.0~1.5
1.5
1.2
4T9A4
1.5~2.5
2.5
2.7
4T013
1.5~2.5
2.5
2.7
4T018
2.5~4
4
2.7
4T023
4~8
6
2.7
4T031
4~8
6
2.7
4T039
4~8
6
2.7
4T045
8~16
16
3
4T060
8~16
16
3
4T075
25~35
25
3
4T089
35~50
35
6
4T103
50~70
50
6
4T140
70~95
70
6
4T168
95
95
6
4T208
85~115
95
10
4T250
85~115
95
10
4T304
95~135
120
10
4T377
165~205
185
10
4Txxx
205~265
240
10
4T414
85~115(x2P)
95x2P
10
4T477
85~115(x2P)
95x2P
10
4T520
125~175(x2P)
150x2P
10
4T605
125~175(x2P)
150x2P
17
4T675
125~175(x2P)
150x2P
17
4T725
85~115(x4P)
95x4P
17
4Txxx
85~115(x4P)
95x4P
17
Important
Wire specifications are determined per an ambient temperature of 50°C and an allowable wire
temperature of 75°C.
The main circuit of the inverter uses open type wiring terminals. For open type wiring terminals,
round crimp terminals are recommended. Refer to table 4-12 for round crimp terminals:
Table 4-12 Specifications of round crimp terminals
Wire cross-sectional area (mm
2
)
Terminal screw specifications
Specifications for round crimp
terminals