Chapter 3 Mechanical and Electrical Installation
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4. Main Circuit Terminals and Connections
Danger Danger
1) The wiring operation is enabled only after confirming that the power switch is OFF.
Otherwise, electric shock may be caused!
2) The wiring operation can only be performed by professional technicians. Otherwise, it
may cause harm to equipment and human!
Reliable grounding is required. Otherwise, it may cause electric shock or fire!
Danger Danger
1) Confirm that the input power is consistent with the rating of inverter. Otherwise, the
inverter may be damaged!
2) Confirm whether the motor adapts to the inverter. Otherwise, the motor may be
damaged or inverter protection may arise!
3) Don’t connect power supply to U, V and W terminal. Otherwise, the inverter may be
damaged!
4) Do not directly connect the brake resistor between the DC bus terminals (+) and (-).
Otherwise, it may cause fire!
1) Instructions of main circuit terminals of single-phase inverter:
Terminals Name Description
L1 and L2
Input terminal of
single-phase power supply
AC single-phase 220V power
connection point
(+)ǃ(-)
Negative and positive
terminals of DC bus
Shared DC Bus input point
(+) and PB
Connecting terminal of brake
resistor
Connect the brake resistor
U, V and W Output terminal of inverter Connect the three-phase motor
Earth terminal
Earth terminal
2) Description of main circuit terminals of three-phase inverter
Terminals Name Description
R, S and T
Input terminal of three-phase
power supply
AC three-phase 380V power
connection point
(+)ǃ(-)
Negative and positive
Shared DC Bus input point
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