I
NSTALLING
B
OARDS
AND
C
ABLING
45
21/1531-ASP11301 Uen B3 2016-02-17
connector on the backplane, remove the top cover and break out the small metal cover.
Use a plier and fold back and forth until it breaks off.
Table 17 Rear Alarm Input 87L00039AAA-A
When any of the alarms is activated it will be detected by the MGU boards.
5.3
AC/DC UNIT ALARMS
The Alarms can either be connected through the ALU2-board or direct into the
DC/DC-board in the 7U-chassis, or direct into the 3U-chassis (front or back side
depending on version of 3U).
Connect the AC/DC unit alarm relay contacts to the inputs of the ALU2 board through
the MDF according to the cabling list for the site. The inputs of the ALU2 are internally
tied to -48 V through serial resistors and the board can therefore detect loop or closing
to 0 V. The resistance from the source to the ALU2 input should be maximum 20 kohm.
5.3.1 FOR
BZA
109
11 (2U POWER UNIT)
For information, see the documentation delivered with the product. These documents
are also stored in the Alex data base in parallel with this document. See document
BCG.00075 for User manual, and 1/1531-BZA10911 for Quick Install Guide.
The power system has a set of ports, alarm contacts, located on the rear side, that
reflect different operating conditions for the power supply, see Figure 37: Rear view of
BZA 109 11 on page 46. Wires to the different alarm units can be fastened to the ports.
The communication with the AC/DC-unit can also be done via the com-module. The
modules have a RJ45-connector to communicate with the LAN.
1
2
3
4
Alarm A
(Relay)
GND
Alarm B
(Relay)
GND