STEP ET Series - Description on Main Circuit Terminal Wiring

Chapter 4 Wiring of Inverter
ET/EP/EH Series Intelligent Flexible Driver Manual
- 39 -
Wire cross-sectional area (mm
2
)
Terminal screw specifications
Specifications for round crimp
terminals
0.5
M3.5
1.25/3.5
M4
1.25/4
0.75
M3.5
1.25/3.5
M4
1.25/4
1.25
M3.5
1.25/3.5
M4
1.25/4
2
M3.5
2/3.5
M4
2/4
M5
2/5
M6
2/6
M8
2/8
3.5/5.5
M4
5.5/4
M5
5.5/5
M6
5.5/6
M8
5.5/8
8
M5
8/5
M6
8/6
M8
8/8
14
M6
14/6
M8
14/8
22
M6
22/6
M8
22/8
30/38
M8
38/8
50/60
M8
60/8
M10
60/10
80
M10
80/10
100
100/10
120
M12
120/12
185
M12
185/12
240
M12
240/12
300
M12
300/12
380
M12
380/12
Important
When determining the cross-sectional area of the wire, give due consideration to the voltage drop of
the wire.
The general selection principle is to keep the voltage change within 2% of the rated voltage. When
the voltage drop is too much, the cross-sectional area of the wire should be increased. The formula
for calculating the voltage drop is as follows:
Voltage drop between lines (V) =
3
* wire resistance (Ω) * current (A)
4.3.4 Description on main circuit terminal wiring
4.3.4.1 Power supply
The inverter must be connected to a protective earth. Considering the high leakage current (over
3.5mA), a protective earth must be used in order to comply with the relevant current regulations.