Introduction
Many frequency converters that are sent back
to Danfoss every year for factory analysis
are diagnosed with No Fault Found (NFF).
Establishing whether a frequency converter is
faulty or not prior returning it to the factory can
increase the uptime of the compressor solution,
reduce the unnecessary use of resources and
limit the number of NFF.
The purpose of this check list is to facilitate
users, eld technicians, engineers and service
personnel working with Danfoss frequency
converters to identify faults and perform a
rst diagnosis on the drive before sending it to
inspection and analysis.
PERFORM THE FOLLOWING FAULT DIAGNOSIS
BEFORE RETURNING A FREQUENCY CONVERTER FOR
FACTORY INSPECTION.
CHECK ALL POSSIBILITIES.
IN CASE OF DOUBT, PLEASE SEEK DANFOSS SUPPORT.
4 FRCC.PC.036.A2.02
Check List
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