Crown RR5795S-45:
Lift Fuse (800amp) Blowing

I have a unit that is blowing the lift fuse during normal operation. The mast is not in a bind, bearings are in fair condition, pressures check out OK and no excessive grounds found. Current draws recorded during normal operation with/without a load and also recorded with with manual lower open. All access modules have been changed, software has been updated, lift motor has been changed, line contactor replaced, buss bars replaced and cable lugs replaced.

Has anyone seen a similar problem? Any suggestions?
  • Posted 18 Dec 2014 12:21
  • Discussion started by AMH_Tech
  • South Carolina, United States
Showing items 1 - 1 of 1 results.
Where are you checking current draw, at the AC motor (AC amps) or at the fuse (DC amps)? Is it blowing constantly (Ie when you are on site) or randomly/intermittently? I would check battery voltage during a range of operation from fully charged to fully discharged, sounds like a bad cell or cells to me. DC current at the fuse will rise in inverse proportion to voltage drop for a given load and it may happen too quickly for the BDI to react before the fuse blows. As long as the relief valve is operating at the correct pressure you can discount the mast assy entirely.
  • Posted 18 Dec 2014 20:12
  • Reply by techno_nz
  • Canterbury, New Zealand

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