Maintenance
4.0MAINTENANCE
4.1Safety Precautions
Observe the safety precautions in Battery Cabinet Precautions on page 2.
Observe all of the warnings below before performing any maintenance on the UPS and associated equipment. Also observe the manufacturer’s safety precautions pertaining to the DC source, along with the DC source safety precautions in this section.
NOTE
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.
! WARNING
Risk of electric shock and high short circuit current. Can cause equipment damage, personal injury and death.
• Extreme caution is required when performing maintenance.
• Be constantly aware that the UPS system contains high DC as well as AC voltages. With input power Off and the DC source disconnected, high voltage at filter capacitors and power circuits should be discharged within 5 minutes. However, if a power circuit failure has occurred, you should assume that high voltage may still exist after shutdown. Check with a voltmeter before making contact.
• AC voltage will remain on the bypass and output circuit breakers 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 chassis ground.
• Any contact between floating circuits and the chassis is a lethal shock hazard. Use differential oscilloscopes when measuring a floating circuit.
• Exercise caution that the test instrument exterior does not make contact, either physically or electrically, with earth ground.
• In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or others approved for use in fighting electrical fires.
! WARNING
Risk of electric shock and high short circuit current. Can cause equipment damage, personal injury and death.
•Always identify connecting wiring prior to disconnecting any wiring.
•Do not substitute parts except as authorized by Emerson® Corporation.
•Maintain the UPS cabinets free of foreign materials such as solder, wire cuttings, etc.
•Contact Liebert Services if you are not sure of the procedures to follow or if you are unfamiliar with the circuitry.
Liebert®NX™ | 30 |