I hope you guys can help me, I got 2 DKC 3-100, and I got the F860 fault, I already check the power transistors and the bridge module and they're fine, however since I plug them with 24V they go directly to that fault.

I checked the optocouplers in the PCB board, A7800, A4504 and CNY17F. I also replaced the A316J, since I had no idea how to test them, for a new ones. I checked capacitors, diodes and they seem be in good value.

I don't know where else to check since all the other smd IC are too small and the fault describes the problem resides on the power stage.

Any help is well appreciate it, I'm going nuts with this drives.