5.0MAINTENANCE

5.1General

The following is a list of general preventive maintenance procedures which should be performed periodically as required according to the environmental conditions and customer maintenance policy to ensure trouble free operation of the Helios DC System 4000/48:

clean all ventilation openings

if these are used, clean or replace the air filters on the rectifiers

tighten all electrical connections

check for hot fuses or breakers (loose, undersized or overloaded)

verify alarms and alarm thresholds

verify calibration settings

verify rectifier settings

The voltage and alarm settings of the controller and rectifiers are based on the type of batteries used with the power system. The recommended settings for various types of batteries can be found in SL-60026, Voltage Level Limits for Power Plants, Rectifiers and Controllers. If unlisted models of batteries are used, it may be necessary to follow specific customer or manufacturer requirements.

The following is list of the tools and test equipment required to adjust the equipment in the Helios DC System 4000/48:

a potentiometer screwdriver, Bourns No. 60 or equivalent

a digital voltmeter, Fluke 8050A or equivalent

a dummy load, 5 kVA

5.1.1Helios Monitor 3000/48

If the power system is equipped with a Helios Monitor 3000/48, refer to the user manual, SL-60015, for maintenance and troubleshooting information.

5.1.2Controller and Rectifiers

The controller and the rectifiers need little maintenance. The following should be checked period- ically in order to ensure trouble free operation.

! WARNING

PREVENTING DAMAGE TO THE EQUIPMENT

DO NOT ATTEMPT ANY OTHER REPAIR THAN THOSE LISTED BELOW. IF ANY PROBLEM PERSISTS, CONTACT LIEBERT GLOBAL SERVICES AT 1-800-LIEBERT.

Cleaning

Clean the front panels and the LED display screens with a soft cloth and isopropyl alcohol.

Calibration

Verify the calibration of the alarm and control thresholds at least once a year. Follow the calibra- tion instructions detailed in the appropriate user manual.

Storage

The rectifiers contain aluminum electrolytic capacitors. For this reason, they shall be either kept in operation, or energized once a year for at least two hours in order to maintain the electrolytic capacitors in good condition.

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Liebert 1500, 4000, 6000 A user manual Helios Monitor 3000/48 Controller and Rectifiers, Cleaning, Calibration Storage

1500, 6000 A, 4000, 3000 specifications

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