9.4.1 Capacitors reforming
The DC bus capacitors must be reformed according to the operation instruction if the VFD has been stored for a long time. The storing time is calculated from the delivery date.
Time | Operational principle |
Less than 1 year | Operation without charging |
1-2 years | Connect with the power for 1 hour before first ON command |
2-3 years | Use power surge to charge for the VFD • charging 50% rated voltage for 30 minutes |
More than 3 years | Use power surge to charge for the VFD |
Use voltage-adjusting power supply to charge the VFD:
The right selection of the voltage-adjusting power supply depends on the supply power of the VFD. Single phase 220V AC/2A power surge is applied to the VFD of single/three-phase 220VAC. The VFD of single/three-phase 220V AC can apply single phase 220V AC/2A power surge (L+ to R, N to S or T). All DC bus capacitors can charge at the same time because there is one rectifier.
High-voltage VFD needs enough voltage (for example, 380V) during charging. The small capacitor power (2A is enough) can be used because the capacitor nearly does not need current when charging.
The operation method of VFD charging through resistors (LEDs):
The charging time is at least 60 minutes if charge the DC bus capacitor directly through supply power. This operation is available on normal temperature and no-load condition and the resistor should be serially connected in the 3-phase circuits of the power supply:
a) 380V drive device: 1k/100W resistor. LED of 100W can be used when the power voltage is no more than 380V. But if used, the light may be off or weak during charging.
b) 500V drive device: 1k/140W resistor
c) 660V drive device: 1k/160W resistor
Figure 10-1 380V charging illustration of the drive device
9.4.2 Change electrolytic capacitors
| • Read and follow the instructions in chapter Safety Precautions. Ignoring the instructions may cause physical injury or death, or damage to the equipment. |
Change electrolytic capacitors if the working hours of electrolytic capacitors in the VFD are above 35000. Please contact with the local offices or diall our national service hotline (400-700-9997) for detailed operation.