Chapter 3 Wiring
11
3-3-2 Connection of inverter output terminals U, V, W
◆
The inverter output terminals are connected to the 3-phase motor in the correct
phase sequence. If the motor rotates in the wrong direction, the wiring of any two phases of
U, V, W can be exchanged.
◆
The output side of the inverter cannot be connected to the capacitor and the surge
absorber.
◆
When the wiring between the inverter and the motor exceeds 50 meters, the
distributed capacitance between the lines will generate a large leakage current, which may
cause the inverter to over-current trip. At the same time, in order to avoid damage to the
motor insulation, the output reactor must be compensated. .
◆
If the installation location of the inverter is quite sensitive to interference, please
install an output noise filter to reduce the carrier frequency of the inverter and reduce
interference.
3-3-3 Braking resistor and brake unit connection
◆
When the load inertia is large and it is necessary to stop frequently or stop for a short
time, when the braking capacity of the inverter is insufficient or to increase the braking torque,
etc., the braking resistor or the braking unit may be selected as needed.
◆
The main circuit B1, B2 terminal is connected to the braking resistor (there is B1, B2
terminal indicates that the inverter has built-in braking unit).
◆
When the inverter has no built-in braking unit, the main circuit (+) and (-) terminals
are connected to the external braking unit.
◆
Do not connect the main circuit (+) and (-) terminals to the braking resistor.
3-3-4 Inverter Grounding Terminal PE
◆
For safety and noise reduction, the ground terminal PE of the inverter must be well
grounded.
◆
Use the specified standard grounding wire and be as short and thick as possible
(grounding impedance 10Ω or less).
◆
The grounding wire of the inverter must not be grounded together with large current
loads such as electric welders and high-power motors, but must be grounded separately.
◆
The power supply line generally adopts 5 core wires, of which 3 are fire wires, 1
neutral wire, and 1 ground wire. It is strictly forbidden to use the neutral wire as ground wire.
◆
When multiple inverters are installed together, all inverters must be directly