AP7500 Hardware Reference Guide
31
II.
Components
Power
Modules
II. System Components
Power Module Rating
The redundant power supply consist of one frame and two identical ATX
power modules. The power supply must be turned on or off through an ATX
power switch connected to the motherboard’s panel connector. The power
modules are rated at 400W each and have passive current sharing on all
outputs. Each power module supplies up to 400W to share the load but do
not provide 800W combined. If one power module fails, 400W load is sup-
ported using one power module.
Power Module Failure
If any of the power modules fail to provide a voltage on any of its outputs,
an audible alarm (located in the frame) will sound and the failed power
module’s LED will turn OFF. The power module’s status LED lights when
both input and output voltages are stable and darkens if either the input or
output voltages fail. If the alarm sounds, perform the following steps:
1. Remove the power cord to the failed power module (with dark LED).
2. Remove the two screws and slide the failed power module out. The alarm
should stop. If not, there may be a problem with the other module or
with the redundant power supply frame (very unlikely).
3. Reinsert the failed power module and plug in the AC cord to confirm.
4. If the alarm sounds again, remove the failed power module and replace
it with a good one as soon as possible.
Top power module partially inserted
Power module screw
(one on each side)
Screw
Status LED (lights when input/
output voltages are stable and
darkens when either input or
output voltages fail)