ESP EX-400 Guía para resolver problemas descargar pdf (Pagina 10)

3.1 General

If this equipment does not operate properly, stop work immediately and investigate the cause of the malfunction.

Maintenance work must be performed by an experienced person, and electrical work by a trained electrician. Do not

permit untrained persons to inspect, clean, or repair this equipment. Use only recommended replacement parts.

TO PREVENT ACCIDENTAL ELECTRIC SHOCK, BE SURE THAT THE WALL

DISCONNECT SWITCH OR CIRCUIT BREAKER IS OPEN BEFORE ATTEMPT-

ING ANY INSPECTION OR WORK INSIDE THE POWER SOURCE.

3.2 Cleaning

Since there are no moving parts (other than the fan) in the power source, maintenance consists mainly of keeping the

interior of the cabinet clean. Periodically, remove the cover from the cabinet and blow accumulated dust and dirt from

the air passages and the interior components, using clean, dry low pressure air. It is imperative that the air passages

to the interior of the unit be kept free of dirt accumulation to ensure adequate circulation of cooling air, especially over

the extrusion fins of bridge rectifier. This unit is NOT designed to be used with air filters of any kind. Any obstruction

to the free flow of cooling air may damage the machine and void the warranty. The frequency of cleaning needed

depends upon the amount of dirt that is drawn into the unit.

3.3 Lubrication

Fan motors with oil tubes located on the side of the motor require lubrication after one year of service. Motors without

oil tubes are permanently lubricated and should not require any attention.

3.4 Testing and Replacing Bridge Assembly Components

The silicon diodes and SCRs used in the Power Source are devices which allow current to flow in only one direction.

They block current flow in the other direction. The diodes and SCRs used in this Power Source are designed to provide

long trouble-free operation; however, should a failure occur, they require replacement. The location and replacement

parts data for the diodes and SCRs are shown in figures 5-1 through 5-4.

If after troubleshooting, the "trouble symptom" appears to be in the Bridge or Boost Bridge (BR, BBR) networks: the

following three-part procedure can be used to determine the faulty component(s): Visual Analysis, Component Group

Testing, and Individual Component/Isolation Testing.

If component repair or replacement is necessary, the Boost Bridge components are readily accessible in the power

source; however, to service Main Bridge components, removing the bridge assembly is recommended.

Before removing the main bridge assembly for servicing, carefully tag (iden-

tify) all interconnecting wires and bus connections to facilitate proper reinstal-

lation. Also, refer to the diagrams and illustrations in the back of this book.

SECTION 3

MAINTENANCE

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 27 28

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ESP EX-400 Guía para resolver problemas Pagina 10