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8Introduction
1.3 Safety Precautions
Read this manual thoroughly, paying special attention to the sections that apply to you, before working with the
UPS. Also read the battery manufacturer’s manual before working on or near the battery.
Under typical operation and with all UPS doors closed, only normal safety precautions are necessary. The area
around the UPS system and Battery should be kept free from puddles of water, excess moisture, or debris.
Special safety precautions are required for procedures involving handling, installation, and maintenance of the
UPS system or the battery. Observe precautions in the separate Installation Manual before handling or installing
the UPS system. Observe precautions in 4.0 - Maintenance, before as well as during performance of all mainte-
nance procedures. Observe all battery safety precautions in 4.0 - Maintenance before working on or near the
battery.
This equipment contains several circuits that are energized with high voltage. Only test equipment desig-
nated 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, dan-
gerously high potentials may exist at the capacitor banks. Observe all battery precautions when near the battery
for any reason.
ONLY qualified service personnel should perform maintenance on the UPS system. When performing
maintenance with any part of the equipment under power, service personnel and test equipment should be stand-
ing on rubber mats. The service personnel should wear insulating shoes for isolation from direct contact with the
floor (earth ground).
Unless all power is removed from the equipment, 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.
Three types of messages are used throughout the manual to stress important text. Carefully read the text below
each Warning, Caution, and Note and use professional skills and prudent care when performing the actions
described by that text.
A Warning signals the presence of a possible serious, life-threatening condition. For example:
A Caution indicates a condition that could seriously damage equipment and possibly injure personnel. For
example:
A Note emphasizes important text. If the note is not followed, equipment could be damaged or may not operate
properly. For example:
WARNING
LETHAL VOLTAGES MAY BE PRESENT WITHIN THIS UNIT EVEN
WHEN IT IS APPARENTLY NOT OPERATING. OBSERVE ALL
CAUTIONS AND WARNINGS IN THIS MANUAL. FAILURE TO DO SO
COULD RESULT IN SERIOUS INJURY OR DEATH. DO NOT WORK ON
OR OPERATE THIS EQUIPMENT UNLESS YOU ARE FULLY QUALIFIED
TO DO SO!! NEVER WORK ALONE.
CAUTION
Make sure you understand the proper sequence before operating any circuit
breaker. Operating a Maintenance Bypass circuit breaker out of sequence could
cut off power to the critical load.
NOTE
If the UPS system has a blown fuse, the cause should be determined before you
replace the fuse. Contact Liebert Global Services.