Exide Technologies Section 94.40 - Manual (Page 64)

SERVICING THE AT30
60
Replacing the ac surge suppressors (VR2, VR4 or VR5)
Turn off and remove all power to the AT30. Remove the plexiglas safety
shield. Disconnect the battery from the dc output terminals TB1(+/-).
For VR2 (connected to L1), VR4 (connected to L2) or VR5 (connected to
L3), remove the hardware from the input terminal L
x, and remove the
lugged lead of the ac surge suppressor. Install one lead of the replacement
surge suppressor onto the L
x terminal. Replace the other wires and the Lx
terminal hardware. Repeat procedure for the I/O ground stud. Tighten all
hardware.
NOTE: The ac surge suppressors are not polarized.
Replacing the dc surge suppressor (VR1)
Turn off and remove all power to the AT30. Remove the plexiglas safety
shield. Disconnect the battery from the dc output terminals TB1(+/-).
Remove the hardware from the output terminal TB1(+), and remove the
lead of the dc surge suppressor. Install one lead of the replacement surge
suppressor. Replace the other wires and the hardware. Repeat for the
output terminal TB1(-). Tighten all hardware.
NOTE: The dc surge suppressor is not polarized.
Replacing the dc surge suppressor networks (VR6/C4, VR7/C5)
Replace these networks as assemblies; do not replace individual parts.
Turn off and remove all power to the AT30. Remove the plexiglas safety
shield. Disconnect the battery from the dc output terminals TB1(+/-).
To replace the network VR6/C4, remove the hardware from the output
terminal TB1(-), and remove the lead of the network. Cut the plastic wire
ties holding the assembly tight against the I/O panel. Install one lead of
the replacement network. Replace the other wires and the hardware.
Repeat for the other lead of the network on the I/O ground stud. For the
network VR7/C5, use the above procedure, but start with the lead on
TB1(+). Tighten all hardware. Replace cut wire ties if possible.
NOTE: The dc surge suppressor networks are not polarized.