Alpha 6000S series, Руководство пользователя

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Chapter 2 Installation and Wiring
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Notes: When a DC reactor is not connected, the supplied short circuit sheet should be short-circuited with "P1" and
"+"
2.4.2 Main Circuit Wiring operation
When the motor is running, please make sure if it is in positive rotation while the motor receives positive rotation
command. If the motor is in reverse rotation, the rotation direction of the motor can be changed by exchanging any
two wires of output terminals (U, V, and W) of the inverter. The rotation direction can also be changed by modifying
the function code P2.37 to change the phase sequence of the motor.
Do not mistakenly connect the input power cable to the output terminal; otherwise the components in the inverter
will be damaged. Output terminals are prohibited to be grounded. The lines should not be collided with the
enclosure, or short connected; otherwise the inverter will be damaged.
Earth terminal PE must be grounded. 380V class grounding resistance should be 10Ω or less. The earth wire should
never share with electric welder or power equipment. The earth wire should be of conductor diameter specified in the
technical standard for electrical equipment, and should be as close to the ground point as possible. On occasions
using more than two inverters at the same time, please do not form the earth wire into ring circuit. Proper grounding
method and incorrect grounding method are shown in Fig. 2-9.
I n v e r t e r
I n v e r t e r R i g h t
I n v e r t e r
I n v e r t e r I n v e r t e r
W r o n g
I n v e r t e r
Figure 2-9 Earthing Connection Method
Notes: The neutral point of motor using Y connection can’t be connected to earth.
Since the inverter output PWM wave, if a capacitor for improving power factor or a lightning varistor is installed on
the output side, which would case tripping or damage to parts, be sure to remove it.
If a contactor or other on-off part is needed to be installed between the output and the motor, be sure the on-off
operation is done when the inverter has no output, otherwise the inverter would be damaged.
Countermeasures to conduction interference: To inhibit conduction interference of the output, besides installing
noise filter and using shielded motor cables, leading all the output cables to earthing metal tube is also a method.
Make the distance between the output cables and the control signal cables greater than 30 cm, the effect of
conduction interference will obviously decrease too.
Countermeasures to RFI: The input cables, output cables and the inverter itself would produce RFI. Placing noise
filters both at input and output sides, and shielded with metal shell would reduce RFI. The cables between the
inverter and the motor should be as short as possible. Measure to reduce RFI is shown as Figure 2-10.
Power
supply
Noise
Filter
Inverter
Noise
Filter
Motor
Metal tube
Metal shell box
Figure 2-10 Method to Restrain RFI