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WARNING!
5.2.1.
Terminal screws torque check
CAUTION
The correct torque of the battery contact screw is important to give a safe electrical
connection and to avoid damage of the screws or threads.
Check the correct torque by loosening the screws by a half turn, adjust the torque of
the spanner to 6.78Nm (5.0 ft-lb.) and fasten the screws again.
Tick off the box in the checklist.
!
Terminal screws torque checked
5.2.2.
Battery terminals greased
To give a good electrical contact with minimum resistance and to protect from
corrosion the contact area between battery terminal and the ring tag of the cables
should be coated with contact terminal grease.
If there is no grease on the terminals or the battery terminals are soiled, loosen the
contact screw, clean the contact areas with a cloth, apply grease to the described
places and fasten the screws again considering the required torque.
Tick off the box in the checklist.
!
Battery terminals greased
5.3.
Environmental conditions
To ensure a trouble free operation of the BBU, some environmental conditions
have to be checked.
Document Number/Version
NTC DN9986052/1.0.0
The mechanical checks of the batteries have to be done in
disconnected mode. Switch off the battery circuit breaker first.
Working on the batteries requires insulated tools. Also the
torque spanner has to be an insulated. Avoid any short circuits.
Do not over tighten the screws by exceeding the given torque
value. If the required torque cannot be reached, check the
screw or battery terminal thread for damage.
©
1999 Nokia Telecommunications Oy
Maintenance Manual
¨ ok or ¨ not ok.
¨ yes or ¨ no.
Page
19 (27)
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