Chapter 3 - Installation Procedure 7400 Series UPS User Manual
Battery Installation Single Module and One plus One Systems
6310018a.02.doc
3-24
Issue 2
(02/98)
3.5 Battery Installation
WARNING
Only qualified personnel should install or service batteries.
A battery can present a risk of electric shock or burn from high short circuit currents.
Eye protection should be worn to prevent injury from accidental electrical arcs.
Remove rings , watches and all metal objects.
Only use tools with insulated handles.
Wear rubber gloves.
If a battery leaks electrolyte, or is otherwise physically damaged, it should be placed in a
container resistant to sulphuric acid and disposed of in accordance with local regulations.
If electrolyte comes into contact with the skin the affected area should be washed
immediately.
Batteries must be disposed of according to local environmental laws.
Due to the inverter design the d.c. bus bar voltage level is dependent on the
system output a.c. voltage. Therefore, the number of battery blocks required
will differ according to the system requirements, as shown below:
380V a.c. system requires 432V d.c. bus bar = 32 battery blocks / 12 V (192
cells).
400V a.c. system requires 446V d.c. bus bar = 33 battery blocks / 12 V (198
cells).
415V a.c. system requires 459V d.c. bus bar = 34 battery blocks / 12 V (204
cells).
The batteries associated with the 80 kVA and 120 kVA UPS can be
contained in a purpose-built battery cabinet ( part number 5320024I
{860mm wide, 250 A circuit breaker}) which sits along side the main UPS
equipment. Sealed, maintenance-free batteries are normally used in this type
of installation.
Where battery racks are used, they should be sited and assembled in
accordance with the battery manufacturer’s recommendations. In general,
batteries require a well ventilated, clean and dry environment at reasonable
temperatures to obtain efficient battery operation.
Battery manufacturers’ literature provides detailed safety measures to be
observed when employing large battery banks and these should be studied
and the proposed battery installation checked to verify compliance with the
appropriate recommendations.
In general a minimum space of 10 mm must be left on all vertical sides of
the battery block. A minimum clearance of 20 mm should be allowed
between the cell surface and any walls. A clearance of 150 mm should be
allowed between the top of the cells and the underside of the shelf above
(this is necessary to for monitoring and servicing the cells). All metal racks
and cabinets must be earthed. All live cell connections must be shrouded.
The batteries are connected to the UPS through a circuit breaker which is
manually closed and electronically tripped via the UPS control circuitry. If
the batteries are cabinet-mounted this circuit breaker is fitted within the
cabinet; however, if the batteries are rack-mounted or otherwise located
remote to the main UPS cabinet then the battery circuit breaker must be
mounted as near as possible to the batteries themselves, and the power and
control cables connected to the UPS using the most direct route possible.
Liebert offer a purpose designed remote battery circuit breaker box,
containing the circuit breaker and its necessary control board, as a standard
option kit. The battery cabinet or circuit breaker box must be bonded to the
UPS cabinet.
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