B&R Inverter | ILF error

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1

Hello Community,

We are using an 8I66T400150.0P-000 inverter equipped with an 8I0IF108.400-3 Powerlink interface card. There are six inverters connected in a daisy-chain configuration, and only one of them is showing an ILF error.

We have already tried replacing the inverter, the interface card, and the Powerlink cable, but the issue still persists on the same unit location.

Has anyone experienced a similar problem?
What could be the possible causes of this ILF error?

2

Hi @kuma1p ,
from ACOPOSinverter P66 User’s manual:

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I see in our Support database, when a customer reports ILF fault, the cause of the problem is related, in most of cases, to:

  1. HW failure
  2. EMC problem
  3. old firmware installed on POWERLINK card

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I see an interesting post Required AR upgrade for new P66 inverters made by @Mohamed where He suggested to upgrade the AR too.
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Regarding powerlink communication card 8I0IF108.400-3 (Which hw version do you have? Do you have the same hw version for all of yours 6 ACOPOS inverters):

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Final input from AI: Which is the cause of ILF error on B&R Automation ACOPOSinverter 8I66T400150.0P-000?

The ILF error (Internal Link Fault) on a B&R Automation ACOPOSinverter, specifically the P66 series model 8I66T400150.0P-000, is primarily caused by an interruption in communication between the inverter’s main power section and its option board (communication card).

Common Root Causes

  • Missing 24 VDC Supply: The communication option board requires a separate 24 VDC supply to function. If this power is missing when the drive is switched on, it cannot establish a link, triggering the ILF fault.

  • Hardware Incompatibility/Firmware Mismatch: Using a newer P66 inverter release with older Automation Runtime (AR) versions can lead to communication board interruptions.

  • Physical Connectivity Issues: Poor seating of the communication card or faulty internal wiring between the card and the base unit.

  • Electromagnetic Interference (EMC): High levels of electrical noise can disrupt the internal high-speed serial link between the module and the inverter control.

    Thanks
    Ciao
    Valerio

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3

Hello,

If none of Valerio’s suggestions solved the issue, contact the local B&R support. It’s suggested in the first screenshot as the last option.

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4

Hi @kuma1p , has been your question answered? can you update us?

5

Hi @kuma1p ,
I would like to add one point I didn’t highlight in my previous comment:

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If you have that incompatibility, inverters enter ILF error directly after startup.
In case of incompatibility you have to call our B&R Support in your area.

Thanks
Ciao
Valerio

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