Safety Precautions - Liebert 7400 Series User Manual

Single module and 1+1 configuration

Table of Contents

7400 Series UPS

Single and 1+1 IOM Manual

THIS UPS DOES NOT INCORPORATE AUTOMATIC BACKFEED PROTECTION. A

WARNING LABEL MUST BE FITTED TO ALL EXTERNAL PRIMARY POWER

ISOLATE THE UNINTERRUPTIBLE POWER SYSTEM BEFORE WORKING ON THIS

In common with other types of high power equipment, dangerous voltages are present within the UPS

and battery enclosure. The risk of contact with these voltages is minimised as the live component parts

are housed behind a hinged, lockable door. Further internal safety screens make the equipment

protected to IP20 standards. No risk exists to any personnel when operating the equipment in the

All equipment maintenance and servicing procedures involve internal access and should be carried out

Battery manufacturers supply details of the necessary precautions to be observed when

working on, or in the vicinity of, a large bank of battery cells. These precautions should be

Particular attention should be paid to the recommendations concerning local environmental

conditions and the provision of protective clothing, first aid and fire-fighting facilities.

When the battery is under charge it is earth-referenced about its mid-point e.g. if the battery

is being charged at 446 V the battery extremities will be at +223V and -223V with respect to

neutral (earth). When using mains-powered test equipment such as oscilloscopes in the UPS

high voltage area, always use a differential mode of operation to avoid the need to

When working inside the UPS (trained personnel only) it is recommended that protection be

worn to prevent eye damage, should an electrical arc be struck by mishandling or severe

Some of the power components are very heavy. If their removal is necessary ensure that

sufficient manpower is available, otherwise use adequate mechanical handling

equipment.When working in the general area of the UPS where high voltages are present, a

second person should be standing-by to assist and summon help in case of accident.