Emerson SERIES 600T Manuel D’Utilisation

Observe all safety precautions in this manual, paying particular attention to Important Safety 

Instructions on page 1.
ONLY qualified service personnel should perform maintenance on the Liebert FS.
Observe all of the warnings below before performing any maintenance on the Liebert FS and associ-

ated equipment.

Before performing preventive maintenance tasks, the Liebert FS must be de-energized and 

electrically isolated (both AC and DC connections to the Liebert FS must be electrically 

disconnected).

Always identify connecting wiring prior to disconnecting any wiring.
Do not substitute parts except as authorized by Liebert Corporation.
Keep Liebert FS cabinets free of foreign materials such as solder, wire cuttings, etc.
Contact Liebert Global Services if you are not sure of the procedures to follow or if you are not 

familiar with the circuitry.

Extreme caution is required when performing maintenance.
Be constantly aware that the Liebert FS contains high DC as well as AC voltages. With input 

power off and the battery disconnected, high voltage at filter capacitors and power circuits 

should be discharged within 30 seconds. 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.
Check for voltage with both AC and DC voltmeters prior to making contact.
When the Liebert FS is under power, both the operator and any test equipment must be 

isolated from direct contact with earth ground and the chassis frame by using rubber mats.
Some components within the cabinet 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. The differential input should have at least 

800 VRMS common mode input rating and a common mode rejection ratio of at least 80dB.
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.