7400 Series UPS
Single and 1+1 IOM Manual 6310018a.02.doc
Prelim v
Issue 2
(02/98)
Safety Precautions
WARNING
THIS UPS DOES NOT INCORPORATE AUTOMATIC BACKFEED PROTECTION. A
WARNING LABEL MUST BE FITTED TO ALL EXTERNAL PRIMARY POWER
ISOLATORS STATING:
ISOLATE THE UNINTERRUPTIBLE POWER SYSTEM BEFORE WORKING ON THIS
CIRCUIT.
General
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
normal manner, following the recommended operating procedures.
All equipment maintenance and servicing procedures involve internal access and should be carried out
only by trained personnel.
Batteries
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
followed implicitly at all times.
Particular attention should be paid to the recommendations concerning local environmental
conditions and the provision of protective clothing, first aid and fire-fighting facilities.
Test Equipment
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
disconnect the oscilloscope frame earth.
Personnel
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
electrical fault.
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.
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