Trane TR200 Drive
Page 3 of 3
d. With power removed from the drive, a physical inspection of the capacitors should not
show
any deformation of the cases of the capacitors or liquid leaking from
them.
e. Low voltage capacitor testers are of no use in checking DC bus capacitors. The
main
concern is to ensure that the capacitors don’t have excessive leakage current when the
DC
bus voltage is applied to it. This cannot be tested at a low
voltage.
f. If one capacitor on the DC bus is found to be weak or damaged, it is important to replace
the
entire capacitor bank. A capacitor with an excessive amount of leakage current
places
excessive stress on other capacitors in the
bank.
g. If it is convenient to access the two halves of the DC bus capacitors, the
inspection
technique given in “c” and “d” can be performed annually. Otherwise, it is best to simply
let
the drive’s internal monitoring circuitry described in “b” provide an indication of
possible
problems.
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