1 IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during installation of your Liebert®
EXLS1™ UPS. Read this manual thoroughly, paying special attention to the sections that apply to your
installation, before working with the UPS. Retain this manual for use by installing personnel.
WARNING! Risk of electrical shock. Can cause personal injury or death. This UPS has several
circuits that are energized with high DC as well as AC voltages. Check for voltage with both AC
and DC voltmeters before working within the UPS. Check for voltage with both AC and DC
voltmeters before making contact. Only properly-trained and qualified personnel wearing
appropriate safety headgear, gloves, shoes and glasses should be involved in installing the UPS
or preparing the UPS for installation. When performing maintenance on any part of the
equipment under power, service personnel and test equipment should be standing on rubber
mats. In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or
those approved for use in fighting electrical fires.
WARNING! Extreme caution is required when performing installation and maintenance. Special
safety precautions are required for procedures involving handling, installation and maintenance
of the UPS system. Observe all safety precautions in this manual before handling or installing
the UPS system. Observe all precautions in the Operation and Maintenance Manual, SL-26090,
before as well as during performance of all maintenance procedures. Observe all DC safety
precautions before working on or near the DC system.
WARNING! Risk of heavy unit falling over. Improper handling can cause equipment damage,
injury or death. Exercise extreme care when handling UPS cabinets to avoid equipment damage
or injury to personnel. Locate the center of gravity symbols and determine the unit’s weight
before handling each cabinet. Test lift and balance the cabinets before transporting them.
Maintain minimum tilt from vertical at all times. Slots at the base of the module cabinets are
intended for forklift use. Base slots will support the unit only if the forks are completely
beneath the unit. Read all of the following instructions before attempting to move, lift or
remove packaging from the unit, or to prepare the unit for installation. The UPS module weighs
up to 4667 lb. (2117 kg).
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