STEP ET Series - Wire Specifications for Control Circuit Wiring

Chapter 4 Wiring of Inverter
ET/EP/EH Series Intelligent Flexible Driver Manual
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Name
Terminal
No.
Signal name
Remarks
Over
temperatu
re
protectio
n
terminal
P1, P2
PTC function connection port
Matching temperature sensor model: PT1000
Over-temperature protection point: 120°C
24 V
auxiliary
power
supply
PS
Auxiliary 24 V power input
Connect to external power supply to make the inverter control
system work;
Power range: +24 V (±5%); required power capacity: 700 mA
0V
Auxiliary 24 V power ground
Modbus
communi
cation
terminal
A+
Modbus communication
signal +
Signal terminal for Modbus communication, with maximu Baud:
115200bps;
The terminal resistance status is selected by the dial switch SW2
(not connected by default);
B-
Modbus communication
signal-
SC
Communication isolated
ground
Modbus communication isolated ground
PE
Shielding layer ground
Note: The analog signal line applies the twisted pair shielded wire, and the shielding layer shall be
grounded properly. And the distance from the power wire shall be greater than 5 cm, preferably
cross wiring with the power wire. Try to avoid the wiring parallel to the power wire. The shielding
layer can be connected to the inverter housing.
4.5.4 Wire specifications for control circuit wiring
The control circuit is recommended to use 600V voltage resistant plastic insulated copper core wire.
Wire specifications and tightening torque are shown in Table 4-16.
Table 4-16 Wire specifications and tightening torque
Inverter model
Connectable wire
specification mm
2
Recommended wire
specification mm
2
Fastening torque (N.m)
Intelligent flexible drivers
full range
0.5~1
0.75
1.5
Wire specifications are determined per an ambient temperature of 50°C and an allowable wire
temperature of 75°C.
Bar terminals are recommended for wiring the control circuit. The specifications of the bar terminal
are shown in Table 4-17.
Table 4-17 Bar terminal specifications
Wire cross-sectional area
mm
2
(AWG)
d1(mm)
d2(mm)
L(mm)
Diagram
0.5(22)
1.3
2.5
16
0.75(20)
1.5
2.8
16.4