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Battery Installation
37
4.0 BATTERY INSTALLATION
4.1 Introduction
Emerson recommends that the batteries in external cabinets be the same type and made by the same
manufacturer as the internal batteries in the Liebert
®
APM
™
.
If multiple sets of batteries connected in parallel are used to provide the required battery backup run
times, fit each set with an isolating device to permit working on one of the battery sets while leaving
the others in service and providing backup protection.
4.2 Safety
Special care should be taken when working with the batteries associated with the Liebert APM
system equipment.
When replacing batteries, replace with batteries of the same type and manufacturer, or equivalent.
Refer to 11.2 - UPS Environmental for a list of approved batteries or contact your Emerson
representative.
!
WARNING
Risk of electrical shock and arc flash. Can cause property damage, injury and death.
The Liebert APM’s internal batteries are connected and energized even if the UPS is turned
Off. To minimize the risk of injury, a properly trained and qualified service person should
disconnect internal batteries before any maintenance is performed on the unit.
When all batteries are connected together, the battery terminal voltage may exceed 324V and
is potentially lethal.
The center of the battery is connected to the neutral of the UPS and is grounded.
A battery can present a risk of electrical shock and high short circuit current. The following
precautions should be observed when working on batteries:
• Remove watches, rings and other metal objects.
• Use tools with insulated handles.
• Wear rubber gloves and boots.
• Do not lay tools or metal parts on top of batteries.
• Disconnect charging source prior to connecting or disconnecting battery terminals.
• Determine whether the battery is grounded. If the battery is grounded, remove source of
the ground. Contact with any part of a grounded battery can result in electrical shock. The
likelihood of such shock can be reduced if such grounds are removed during installation and
maintenance.
!
CAUTION
Batteries used in the Liebert APM and its auxiliary cabinets must be of an approved type.
Replacing batteries with an incorrect type can cause an explosion and fire. Refer to Tables 39
and 40 for acceptable batteries.
Do not dispose of batteries in a fire. The batteries may explode. Do not open or mutilate
batteries. Released electrolyte is harmful to the skin and eyes. It is toxic.