Maintenance 107
WARNING
EXTREME CAUTION ISREQUIRED WHEN PERFORMING
MAINTENANCE.
BE CONSTANTLYAWARETHAT THE UPS SYSTEM CONTAINS HIGH
DCAS WELLAS AC VOLTAGES.WITH INPUT POWER OFF AND THE
BATTERYDISCONNECTED, HIGH VOLTAGEAT FILTER CAPACITORS
ANDP OWER CIRCUITS SHOULD BE DISCHARGED WITHIN 30
SECONDS.H OWEVER IF A POWER CIRCUIT FAILURE HAS
OCCURRED, YOU SHOULD ASSUME THATHIG H VOLTAGEMAY
STILLEXIST AFTER SHUTDOWN. CHECK WITH A VOLTMETER
BEFOREM AKING CONTACT.
ACVOLTAGE WILL REMAIN ON THE BYPASS AND OUTPUT CIRCUIT
BREAKERS, AND THE STATICBYPASS SWITCH, UNLESS ASSOCIATED
EXTERNAL CIRCUITB REAKERS ARE OPENED.
CHECK FOR VOLTAGEWITH BOTH AC AND DC VOLTMETERS PRIOR
TOMAKING C ONTACT.
BE SURETO READ THE BAT TERY MANUFACTURER’SMANUAL
BEFOREWORKING ON OR NEAR THE BATTERY. BATTERY
TERMINALSW ILL CONSTANTLY BE ENERGIZED, REGARDLESS OF
WHETHERTHE UPS IS OPERATING OR NOT.
WHENTHE UPS SYSTEM IS UNDER POWER, BOTH THE OPERATOR
ANDAN Y TEST EQUIPMENT MUST BE ISOLATEDF ROM DIRECT
CONTACTWITH EARTH GROUND AND THE UPS CHASSIS FRAME BY
USINGRUBB ER MATS.
SOME COMPONENTS WITHIN THE: CABINETS ARE NOT CONNECTED
TOCHASSI S GROUND.
ANYCO NTACTBETWEEN FLOATING CIRCUITS AND THE CHASSIS IS
ALE THALSH OCK HAZARD. — USE DIFFERENTIAL OSCILLOSCOPES
WHEN MEASURING A FLOATINGCIRCUIT. THE DIFFERENTIAL
INPUTSHO ULD HAVEAT LEAST 800 VrmsCO MMON MODE INPUT
RATINGAND A COMMON MODE REJECTIONRATIO OF AT LEAST
80dB.
EXERCISECAUTION THAT THE TEST INSTRUMENT EXTERIORDOES
NOTM AKE CONTACTEITHER PHYSICALLY OR ELECTRICALLY
WITHE ARTHGROUND.
INC ASE OF FIRE INVOLVINGELECTRICAL EQUIPMENT, USE ONLY
CARBON DIOXIDE FIRE EXTINGUISHERS, OR OTHERS APPROVED
FORUSE INEL ECTRICAL FIRE FIGHTING
DISCONTINUED
PROD U C T