VDC link connection

Operation without VDC link connection:

  • Approved only for PWM frequency 4 kHz or 8 kHz.

 

Operation with VDC link connection

Connection of inverter terminal +R with HF..-503 Kl. V5 or HF..-403 Kl. 7

 

INFORMATION

  • Optimized grounded filter effect.
  • Improved filter effect in the low-frequency range (≤ 150 kHz).
  • Only approved for PWM frequency 12 kHz or 16 kHz. Note that increased losses (= power reduction) occur in the inverter when operating with 12 kHz or 16 kHz.
  • Set PMW fix = on; the inverter must not be able to reduce the PWM frequency automatically
  • Strictly observe the following for HF..-403: VDC link connection is only permitted if Vline ≤ AC 400 V, not if Vline = AC 500 V.
  • The VDC link connection increases the inverter load. The DC link connection increases the required inverter output current in relation to the rated output current of the inverter as shown in the following table.

fPWM

Vline = 3 × AC 230 V

Vline = 3 × AC 400 V

Vline = 3 × AC 500 V

12 kHz

4%

12%

15%

16 kHz

3%

8%

12%

The increased power requirement causes an additional load on the inverter. Take this aspect into account during project planning of the drive. Failure to comply with this aspect may cause the inverter to shut down due to overload.

INFORMATION

  • No VDC link connection is permitted for size 0XS units.
  • No VDC link connection is possible with HF180‑403.

The procedure for selecting the PWM frequency and checking the inverter is summarized in the following figure.