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.
To Next Page
Loading...