7(10)
Datum/Date
Rev
Dokumentnr/Documentnr
Uppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved
Kontr/Checked
Tillhör/Referens-File/Reference
1998-05-29
A
1531-BML 351 048 Uen
INSTALLATION INSTRUCTION
Faktaansvarig - Subject responsible
6
REPLACING THE BML UNIT
6.1
BML 351 048 mounted on an
exchange cabinet.
1
Inform the customer that your work is
going to stop his exchange for a while.
2
Unscrew and remove the front cover from
the exchange cabinet. Note the position of
the boards and cables.
3
Lower the bottom plate, turn OFF power
and the circuit breaker on the battery unit.
4
Remove all cables and the boards from
the exchange. Disconnect the power cord
from the wall and from the BML unit.
5
Disconnect the three cables (A,B,C or D)
from the BML unit that run to the system
(do not disconnect the other end).
6
If installed, slide out the battery unit from
the exchange cabinet. The cables
connected to it, will follow the battery unit.
Take off the back plane.
7
Unscrew the four screws in the back of the
cabinet holding the BML unit.
NOTE: releasing the last screw will let the
BML unit drop out. Hold it from below and
remove it by letting it slide down.
8
Position the new BML unit so that the
connectors are located at the bottom and
the four mounting holes are facing the
back of the cabinet.
9
Slide the BML unit in at the rear of the
cabinet and secure it with the four screws.
10
If available, install the battery unit by
sliding it into slot 6 of the exchange
cabinet.
11
Reconnect the three cables (A,B,C or D)
disconnected under item 5.
12
Install the power cord and connect to
mains. It is good practice to measure the
-48 volt (-54 volt) before installing the rest
of the equipment.
Then turn on the circuit breaker.
13
Note that as soon as the cable is plugged
in (A) and the circuit breaker is ON, the
-48 V are present in the system.
14
If no battery backup unit is to be installed,
an empty 6-pin connector, supplied with
the unit, must be plugged in position (A) to
prevent ESD discharges directly to the
connector.
To prevent electrostatic discharges (ESD) directly to
the alarm connector pins use the enclosed plastic 2-
pin plug and plug it into output (B) when the alarm
feature is not used.
15
The replacement of the BML unit is now
completed. Reinstall the boards and
cables. Turn on the power in the cabinet.
Take care that the system starts up
correctly.
16
Raise the bottom plate, replace the front
cover and tighten the two screws at the
bottom of the front cover.
17
Inform the customer that the system is in
operation.