Going to TIU Rev L from Rev I

Dave,

Is there any potential for harm to the TIU if the filters are not removed prior to  bringing Rev L on-line?

No, there is not.

Regardless, the suggested procedure is to swap the TIUs and remove the filters before testing DCS signal strength with the Rev. L. Then, if necessary, replace the appropriate filters for any channel where the filters actually improve the signal strength.

Hi guys! I just got a NIB never used Rev.I TIU which I'll be upgrading with the latest 5.0 software. This will be my first use of DCS and I plan connect a cab1 base to the TIU using MTH's #50-1018 tiu/tmcc connector cable so I can control both DCS and TMCC engines with the dcs remote. For now, my set-up will be a carpet central with two FasTrack loops approximately 6x8 and 4x6 in size powered by a Z-4000 transformer. As said, I'm new to both DCS and TMCC and have never heard of engineering filters. What are they and are they something I will need for my set-up? Also, although the TIU has 20 amp internal fuses should I add fast burning external fuses or circuit breakers to my set-up? If you recommend using engineering filters, external fuses, or both, then how many should I use, where should they be placed, and what size or amperage should I use? Thanks for your assistance.

Each of my loops have a glass cartridge fast blow agc 7.5 amp between the transformer and the TIU inputs.

Willygee's advice is correct.  Breakers are cheaper in the long run.

Opening a TIU to replace a fuse is too much wear & tear on the plastic case, is time consuming, and probably requires removal of TIU form the layout.