Table of Contents
Advertisement
Chapter 3 - Battery Installation
3.2
Safety
Special care should be taken when working with the batteries associated with the 'Hipulse' UPS System equipment.
When all the cells are connected together, the battery terminal voltage will exceed 400V and is potentially lethal. A
primary safety consideration is to physically isolate the battery installation from all but appropriately qualified
maintenance personnel; which is best achieved by locating the cells in a dedicated battery room. Specific battery
cabinet and battery room design details are given later in this section.
The following general battery safety precautions and WARNINGS should be observed at all times:
a) A battery can present risk of electric shock or burn from high short circuit currents.
b) When connected in a string the voltage could be 460V d.c. this voltage is potentially lethal always observe high
voltage precautions.
c) Only qualified personnel should install or service batteries.
d) Eye protection should be worn to prevent injury from accidental electrical arcs.
e) Remove rings, watches, necklaces, bracelets and all metal objects.
f)
Only use tools with insulated handles.
g) Wear rubbers gloves and a rubber apron when handling batteries.
h) 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.
i)
If electrolyte comes into contact with the skin the affected area should be washed with plenty of clean water
immediately.
j)
Batteries must always be disposed of according to local environmental laws.
k) When replacing batteries use the same number and type that were originally fitted.
l)
Disconnect charging source prior to connecting or disconnecting battery terminals.
m) Determine if the battery is inadvertently grounded. If inadvertently grounded, remove source of ground. Contact
with any part of a grounded battery can result in electrical shock.
3.3
UPS Batteries
Battery can be VRLA, Ni-Cd or wet cell type.
It is common practice in UPS installations to use valve regulated cells. The term 'valve regulated' is used currently in
place of either 'sealed' or 'maintenance free' both of which have been used in the past.
Valve-regulated cells are not 'sealed,' and will vent. The amount of gas given off is less than for a flooded cell but
when considering the design of the battery installation allowances must be made for adequate ventilation and heating of
the cells. Boost charging must not be applied to valve regulated cells as this will cause them to overcharge and
subsequently vent.
Similarly, valve-regulated cells cannot be regarded as 'maintenance-free' as they must be kept clean and their
connections checked periodically for tightness and lack of corrosion. It is not possible to check the cells' specific
gravity directly but the battery can be checked by the 'CS PG battery service programme' which can give an indication
of faulty cells or cell degradation within the battery.
Batteries are fully charged before delivery; however, storage and transportation times mean that, inevitably, some
charge is lost by the time the battery is commissioned. All the cells forming the battery should be brought to the same
state of charge and be recharged within 6 months of the factory charge.
It is especially important that the battery is fully charged before attempting a witness test of the autonomy time. This
may require several days to complete; therefore any witness test concerning the batteries should take place only after
the battery has been on uninterrupted float charge for at least one week.
Cell performance typically improves after a few weeks in service or after two or three discharge/recharge cycles.
Page 3-2
Liebert Hipulse E
WARNING
(07/04)
Installation Manual
Single or '1+N' UPS System
Advertisement
Table of Contents
