Remove and Install the Control Transformer Fuses (FH4) for Frame 7

Replace control transformer fuses (labeled FH4) with the appropriate kit catalog number: SK-RM-IBFH2-FUSE2A-F8 (400V/480V/600V), SK-RM-IBFH4-FUSE5A-F7 (400V/480V/600V), SK-RM-IBFH2-FUSE2B-F8 (690V), or SK-RM-IBFH4-FUSE5B-F7 (690V). The fuse holders (labeled FH4) are on the AC precharge control panel. Follow these steps to remove the control transformer fuses.
  1. Review the product advisories in Before You Begin.
  2. Remove power from the system.
  3. Open the enclosure door.
  4. Remove the protective guard. See Remove and Install the Protective Guard for Frame 7.
  5. Pull out on the tabs at the top of the fuse holder that is labeled FH4 and remove the fuses.
    example of how to remove the frame 7 control transformer fuses
  6. Install the control transformer fuses in the reverse order of removal.
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