AOpen DE7200 Series Instruções de Operação descarregar pdf (Página 83)

MAINTENANCE

31 Dec 13 5-21

DE-7200VFDCentrifuge

TROUBLESHOOTING DE-7200 VFD CENTRIFUGE

Possible Cause Isolation Procedure & Corrective Action

Failure Mode 13: Air Conditioner Evaporator Fan Fails to Go On

Poor electrical connection Shut down, lock out, and tag out electric power to centrifuge.

Open control cabinet door, and locate fan at upper right.

Remove eight screws securing fan to air conditioner housing,

and separate fan from housing. While supporting fan, check

that fan plugs are securely connected and that all leads are

secure in connectors. Correct as required; continue

troubleshooting if leads are secure.

Fan motor bearings binding or

seized

With fan separated from air conditioner housing, unplug and

remove fan. Check that fan rotates freely and no rubbing is

detected. Replace fan if rubbing or binding is found.

High temperature switch in

motor winding defective

Using an ohmmeter, check for continuity across two light gray

motor leads of fan connector (Figures 5-10 and 5-13). If meter

indicates an open circuit, verify that leads are securely

connected; correct as needed. If connections are secure,

replace fan.

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AOpen DE7200 Series Instruções de Operação Página 83