Exide Technologies Section 94.40 - Manual (Page 62)

SERVICING THE AT30
58
3.5. REPLACING DEFECTIVE COMPONENTS
WARNING
High voltages appear at several points inside the AT30. Use extreme
caution when working inside the unit. Do not attempt to work inside the
AT30 unless you are a qualified technician or electrician.
Disconnect and lock out all power from the AT30 before starting to
remove or replace any components. Turn the ac power off at the
distribution panel upstream from the charger. Disconnect the battery
from the AT30 output terminals TB1(+/-).
For information on identifying internal components, refer to the standard
drawings featured in Appendix C.
Removing the safety shield (if present)
Some AT30 enclosures feature a clear plexiglas safety shield, as a second
protective barrier between the user and the internal components. Some of
the following repair procedures require the removal of this shield to access
internal components.
Open the front door and remove the clip fasteners from the front of the
plexiglas shield. Lay or lean the shield near the enclosure. Do not lay the
shield on the top of the AT30. The top vents on the enclosure are
required for cooling of the unit.
Attach the plexiglas safety shield back onto the enclosure opening using
the clip fasteners after replacing components and before starting up the
unit.
CAUTION: Hazardous ac and dc voltages are present on the I/O
panel terminals and several internal components.