ABB O3EC HENF442581R1 Relay output module

The procedure for removing the fans is as follows. Unscrew the captive screws (two for each) that attach each fan to the chassis. After the base screws are loose, remove the two screws near the top which screw into the flat chassis plate where the A100 PCB is mounted. After unsoldering the wires to the AC terminal, the fan assembly can be removed. To install, follow the reverse order.

MAIN RECTIFIER ASSEMBLY 

To remove the rectifier assembly, face the front panel. The chassis left side cover has to be removed. This side cover is fastened with seven screws to the chassis. After this side is removed the rectifier assembly can be accessed. The two bottom flat head screws, hold the bracket to the chassis. After the flat head screws are removed, the five large wires and eleven small wires must be removed before the assembly is ready for removal. Because of the large number of wires, mark each wire as it is being removed so that it can be replaced correctly.

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