Wiring
24
power supply.
4.5.1.3 AC reactor
In order to prevent the rectifier damage resulted from the large current, AC reactor
should be installed at the input side. It can also prevent rectifier from sudden
variation of power voltage or harmonic generated by phase-control load.
4.5.1.4 Input EMC filter
The surrounding device may be disturbed by the cables when the inverter is working.
EMC filter can minimize the interference. Just like the following figure.
Figure 4.13 Wiring at input side of main circuit.
4.5.2 Wiring at inverter side of main circuit
4.5.2.1 DC reactor
Inverter from 18.5kW to 90kW have built-in DC reactor which can improve the
power factor.
4.5.2.2 Braking unit and braking resistor
• Inverter of 15KW and below have built-in braking unit. In order to dissipate the
regenerative energy generated by dynamic braking, the braking resistor should
be installed at (+) and PB terminals. The wire length of the braking resistor should
be less than 5m.
• Inverter of 18.5KW and above need connect external braking unit which should be
installed at (+) and (-) terminals. The cable between inverter and braking unit
should be less than 5m. The cable between braking unit and braking resistor
should be less than 10m.
• The temperature of braking resistor will increase because the regenerative energy
will be transformed to heat. Safety protection and good ventilation is
recommended.
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