Emerson Liebert NXL series, Operation And Maintenance Manual

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Liebert NXL UPS Operation and Maintenance Manual 250-300-400-800kVA
Page 10
I
MPORTANT
S
AFETY
I
NSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during
installation and maintenance of your Liebert NXL™ UPS and batteries.
Retain this manual for use by installing personnel.
WARNING
Risk of electrical shock. Can cause personal injury or death.
Exercise extreme care when handling UPS cabinets to avoid equipment damage or
injury to personnel. Refer to separate installation manual for equipment handling
information and installation procedures.
Follow all battery safety precautions in 3.0 - Maintenance when installing, charging or
servicing batteries. In addition to the hazard of electric shock, gas produced by
batteries can be explosive and sulfuric acid can cause severe burns.
In case of fire involving electrical equipment, use only carbon dioxide fire
extinguishers or others approved for use in electrical fire fighting.
Extreme caution is required when performing maintenance. Service and maintenance
work must be performed only by properly trained and qualified personnel and in
accordance with applicable regulations as well as with manufacturers’ specifications.
Be constantly aware that the UPS system contains high DC as well as AC voltages.
With input power off and the battery disconnected, high voltage at filter capacitors
and power circuits should be discharged within 5 minutes. However, if a power circuit
failure has occurred, assume that high voltage still exists after shutdown. Check with
a voltmeter before making contact.
AC voltage will remain on the system bypass, the UPS output terminals and the static
bypass switch, unless associated external circuit breakers are opened.
Check for voltage with both AC and DC voltmeters prior to making contact.
When the UPS system is under power, both the operator and any test equipment must
be isolated from direct contact with earth ground and the UPS chassis frame by using
rubber mats.
Some components within the cabinets are not connected to the chassis ground. Any
contact between floating circuits and the chassis is a lethal shock hazard. Exercise
caution that the test instrument exterior does not make contact, either physically or
electrically, with earth ground.
This equipment contains circuitry that is energized with high voltage. Only
test equipment designated for troubleshooting should be used. This is particularly
true for oscilloscopes. Always check with an AC and DC voltmeter to ensure safety
before making contact or using tools. Even when the power is turned Off, dangerously
high voltage may exist at the capacitor banks.
Observe all battery precautions when near the battery for any reason.
ONLY properly trained and qualified service personnel should perform
maintenance on the UPS system.
When performing maintenance on any part of
the equipment under power, service personnel and test equipment should be standing
on rubber mats. The service personnel should wear insulating shoes for isolation from
direct contact with the floor (earth ground).
One person should never work alone.
A second person should be standing by to
assist and summon help in case an accident should occur. This is particularly true
when work is performed on the battery.