Barco – TransForm A – DOC-3358-2 – service manual – Revision 06 – March 2007
__________________________________________________________________________
3-6
3.2.3
Redundant power modules of the OmniBus A12
The O
MNI
B
US
A12 with redundant, hot-plug power modules can be connected to three independent power nets. If
one of the three power modules or a power net is failing, you can hear a buzzer alarm that can be reset by push-
ing the red
buzzer reset button [5] at the front of the O
MNI
B
US
Figure 2-7 Front view of OmniBus
. Also the LED
standby / component failed [6] at the front starts blinking. This LED remains blinking as long as
the failure persists even if the
buzzer reset button has been pressed.
23
27
24
28
25
23
air supply
24
mains connection
25
LED: power status
27
unlock-handle-bar
28
handle
Figure 3-5
Power module on the rear of O
MNI
B
US
A
12
The defective power module or the failing power net can be located by examining the individual LED’s
power
status [25] on the back of the device. If the LED of one power module is off or lightens red while the LED’s of the
other two power modules lightens green, then the power module with the non-green LED is either defective and
must be re-placed or the power net connected to it has failed.
Exchange of a redundant power module
Take care NOT to remove a power module from the device unless you unplugged its power
cord.
Never touch the contacts on the backside of a power module. There is the danger of being
harmed by residual voltage! Furthermore the operation of the power module might be
impacted by impurities!
Use gloves to remove the power module. The cover of the power module is been used as
heat sink for cooling, usually the temperature is around 50 – 60° Celsius under full
condition!
•
Locate the defective power module by examining the
LED’s [25] on the individual power modules, please
see above.
•
Unplug the power cord from the
mains connection [24] of the concerned power module!
•
Push the
unlock-handle-bar [27] to the right unless the power module is released, keep it at the right and
remove the defective power module by pulling at the
handle [28]!
•
Take a new power module and insert it into the system. Take care to insert it in the same orientation like
the other modules with the
mains connection [24] on the left side!
•
Make sure that the
unlock-handle-bar [27] engages!
•
Re-plug the power cord into the
mains connection [24]!
•
Check that the
LED [25] starts to lighten green!
•
Check that the red LED
standby / system failed [6] at the front of the O
MNI
B
US
A12
stops to lighten!
Please note: As soon as the defective power module is removed and the remaining two power modules are
working well, this LED will also stop to lighten. It only indicates if a defective component is in the device.
