Shanghai STEP Electric corporation
Figure 4.6 Main circuit terminals for 30kW Inverters
PE
R
S
T
-
○
＋
2
B
U
V
W
Figure 4.7 Main circuit terminals for 37kW Inverters
PE
R
S
T
-
○
＋
2
B
U
V
W
Figure 4.8 Main circuit terminals for 45KW/55KW/75KW Inverters
4.3.2 Symbols and Functions of Main Circuit Terminals
g
Inverter wirin
The functions of main circuit terminals are listed in Table 4.1.
Table 4.1 Functions of main circuit terminals
Terminal Symbol
Function
E
（
or PE
）
Ground (PE)
R0, T0
220V emergency power input
R1, T1
380V 2-phase input of pre-charge circuit
R, S, T
AC power for the main circuit, to 3-phase input
○
－
Negative output of DC bus
○
＋
1
Positive output 1 of DC bus
○
＋
2
Positive output 2 of DC bus
To connect DC reactor
○
＋
1,
○
＋
2
○
＋
2, B
External braking resistor connection
○
＋
2,
○
－
48V DC power for bus to run at a low voltage
U, V, W
Inverter output, to 3-phase synchronous/asynchronous machine
Note: except for Inverters of 18.5kW and 22kW, Terminals R0, T0, R1, and T1 are not on
the main circuit but on the drive PCB.
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