MINI-LINK BAS 8-12
Technical Description EN/LZB 111 0542 P2B
8.4.3 POU
The function of these POUs is conversion of central office –48 V
system voltage into 5,15 V supply voltage and 1,5 V reference voltage
required by the other plug in units in the C-AAS (CE Shelf).
The boards are designed for 2-wire or 3-wire distribution, 48 V return
is separated from signal reference ground, and the input voltage range
is -38,0 V to –60 V. This POU also provides inputs for alarm signals
from an external fan unit.
The POU has two front panels LEDs. When the input voltage exceeds
35 V, one of the LED’s is lit. The red LED is lit when any of the
output voltages is below its lower tolerance limit, otherwise the green
one is lit. When the POU is powered up both LEDs are lit for approx.
1 s, regardless of the output voltages.
The POU has alarms for loss of one input feeder or loss of output
voltages for the possible faulty POU.
Maximum output power is 120 W.
8.4.4 Fan Unit for Front Access AAS
A fan unit is mounted directly above the front accessible C-AAS (CE
Shelf) as a plug-in unit with the same characteristics delivered
together with the shelf.
The fan unit has a mounting plate which carries all functionality (the
fan motors, the control board with all connectors and the internal
wiring).
This mounting plate is combined with a covering and a front panel to
form the complete unit. The dimensions excluding mounting
mechanics are 50x210x450 mm, HxDxW.
The fan unit is temperature regulated, meaning that rotational speed is
low for normal temperatures but increases at high temperature of the
air stream.
This regulation is present in order to increase life time as well as to
lower sound level, contamination and power consumption. The fan
unit has two types of alarms, A & B.
The A alarm is activated by the following conditions:
• Temperature exceeds 65°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 55°C.
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