EnerSys PowerSafe 2DDM50-09, Installation, Operation & Maintenance Manual

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2. Battery Location and Accommodation
2.1 Location
Batteries should be located in a secure area with access
restricted to experienced, suitably qualified personnel.
2.2 Accommodation
Conventional, non-seismic steel stands are supplied as
standard with PowerSafe
® DDm batteries. Optionally, anti-
shock stands are available. Seismic UBC Zone 4 stands are
also available and covered in a separate manual.
Where appropriate, European/National or Local Regulations
must take precedence. However, in the absence of any
regulations the following precautions are recommended.
PowerSafe DDm batteries should be located in a secure,
restricted area. It is normal practice to electrically isolate the
stand from the ground. This provides a degree of protection
during installation and maintenance. This protection is only
valid provided the system connected to the battery is also
isolated from the ground. In applications where the equipment
connected to the battery is not isolated from the ground,
e.g. un-isolated battery chargers, then either:
• the battery stand is connected to the ground.
• a secondary safety barrier is built around the stand to
prevent accidental contact, and facilities should exist for
earth connections to be made remotely before routine
surveillance and maintenance takes place.
Similar hazardous conditions on the battery stand can be
generated by environments of high microwave intensity and
the same safety precautions should prevail. Satisfactory
ground connection to the steel stands can be made via the
bolts retaining the diagonal tie bars to the main stand frames.
Seismic stands should be earthed via the base plate bolts or
as directed in the stand assembly instructions.
2.3 Safety
Warning notices complying with current Health & Safety
legislation should indicate the dangers of unauthorised access.
Within the secure restricted areas, safety instructions should
also be provided to advise qualified personnel of the safe
methods to enter the system. The use of earth leakage
detection equipment is recommended where the stand is
permanently earthed.
3. PowerSafe ® DDm Batteries
EnerSys ® PowerSafe DDm range combines the benefits of
large capacity, long life cells with a choice of compact racking
systems to provide totally reliable, cost-effective solutions for
large installations. Detailed information regarding the design
and specification of PowerSafe DDm batteries can be found in
the appropriate publications (visit www.enersys-emea.com or
contact your local office for details).
PowerSafe DDm Valve Regulated Lead Acid (VRLA) batteries
use proven gas recombination technology. They are supplied
in a filled and charged condition and are electrically live at all
times so must be treated with care. Even if the case or lid
suffers damage, the product remains capable of supplying
high short circuit currents.
PowerSafe DDm batteries are supplied in dedicated steel
containers that maintain the uniform compression throughout
product life necessary to ensure reliable performance.
They are designed to be installed in the horizontal position
that affords simplified, front access installation and
maintenance even in the most difficult locations.
4. Receiving, Unpacking and Inspection
All cells should be handled with care; damage to the container
or lid can occur if allowed to fall. Under no circumstances
should they be lifted by the terminals.
All items should be carefully checked against the
accompanying advice notes to determine if any are missing.
They should be inspected for damage and the terminal voltage
of each cell measured to ensure that none are below the
equivalent of 2.10 Volts per cell. If any are below this value,
or if any items are missing, damaged or broken the Company
should be notified at once.
Transit insulation covers are provided to protect the cell
terminals. These are factory fitted to all products of the range
and should only be removed when access to the terminals is
required.
It is recommended that all cells and accessories are unpacked
before commencing installation; only unpack and install 'cell
by cell' in areas of limited access.
5. Care of Material
Carefully clean off all dust and packing material deposits from
each of the cells and accessories. Wipe down the cells as
required with a clean, cotton cloth dampened with clean water.
If necessary, a small amount of mild detergent may be added
to the water to remove any greasy film.
Note that scouring powders and solvents should not be used
for cleaning the lids as scratching or damage to the surface of
the plastic could occur.
6. Storage and Refresh Charge
It is recommended that batteries are unpacked, installed and
commissioned as soon as possible after receipt. However,
if this is impractical, all the parts should be stored in a clean
and dry environment with temperature as moderate as the
climate will allow.
PowerSafe DDm batteries are supplied in a filled and charged
condition so storage time is typically 6 months at 20°C.
Storage at higher temperatures will result in accelerated rates
of self-discharge that could possibly result in a permanent
deterioration to battery performance and life. Consequently,
it is recommended that cells be given a refresh charge when
the open circuit voltage falls below 2.10Vpc.
Providing the battery is to be installed and commissioned
before a refresh charge becomes due, no further action is
required prior to installation. However, if the battery is to be
stored for prolonged periods, it must be given a refresh
charge as follows:
• connect in series (i.e. in continuous sequence positive,
negative, positive, negative) the correct number of cells to
correspond with the output voltage of the charging source
which should be of the constant voltage type. The
recommended applied charge voltage is 2.28±0.01Vpc
(at 20°C) or temperature compensated equivalent
(see section 9.2.1).
• connect charger positive output to battery positive terminal
and charger negative output to battery negative terminal.
Switch on and leave connected for a continuous period of
48 hours when the charge can be discontinued.
PowerSafe DDm batteries should only be charged in the
horizontal position. Charging in the vertical position could
invalidate the warranty.