8-13 MINI-LINK BAS
EN/LZB 111 0542 P2B Technical Description
• Cabling faults (supervision cable unplugged, in this case
receiving of A-alarm is not possible).
• One fan motor faults.
• Controller faults.
Noise level measured 1m from front panel is 35-50 dB (A) depending
on air temperature.
If the front access shelf is powered from two redundant –48 V feeders,
the power connection board is used for connecting the fan unit. The
power connection board has two –48 V inputs and one –48 V output.
8.4.5 Fan Unit for Rear Access AAS
This fan unit is plugged into the rear access C-AAS (CE Shelf) using
one 9 pins DSUB connector for both duplicated –48 V power and
alarm. It has the same characteristics as front access fan unit.
The fan unit has two types of alarms, A & B.
The A alarm is activated by the following conditions:
• Temperature exceeds 70°C.
• There is no input voltage. Threshold voltage for this alarm is 37
V +/-2 V.
• All fan motors are faulty.
The B alarm is to be activated by the following conditions:
• Temperature exceeds 65°C.
• Connection fault
(FU unplugged, in this case receiving of A-alarm is not possible).
• One fan motor faults.
• Controller faults.
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