Learning Protection Features
Lifetime diagnosis of components
Registering a capacitance reference for inspection
To perform a capacitor diagnosis, a capacitance reference must be measured and registered by
setting Pr-61 (CAP Diag) to 1 (Ref Diag) when the inverter is used for the first time. The
measured reference value is saved at Pr-63 and is used asthe reference for the capacitor life
diagnosis.
Refer to the following instructions to measure a reference capacitance.
1 Set an appropriate capacitor diagnosis current based on the inverter’s rated output at
Pr-60 (CAP DiagCurr).
• The capacitor diagnosis current is a direct current that is applied to the capacitor for
inspection, and is defined asin a percentage of the rated inverter output. Because the
value is defined based on the inverter output, set an appropriate value if the motor
has smaller rated current.
2 At Pr-62 (CAP Exchange Level), set the capacitor replacement warning level to a value
between 50.0% and 95.0%
3 Set Pr-61 (CAP Diag) to “1” (Ref Diag). Then, the direct current set at Pr-60 (CAP
DiagCurr)is output.
• The capacitor diagnosis is only available when the inverter is stopped.
• If Pr-61is set to 1 (Ref Diag), the displayed value at Pr-63 reflects 100% of the
measured capacitance.
• If you plan to perform a capacitor diagnosis using Pr-61(CAP Diag), the initial
capacitance must be measured when the inverter is used for the first time. A
capacitance measured on a used inverter leads to inaccurate inspection results due
to an incorrect reference capacitance value.
4 Turn off the input to the inverter.
5 Turn on the inverter when a low voltage trip (LVT) occurs.
6 View the value displayed at Pr-63 (CAP Diag Level). When Pr-61 is set to “1” (Ref
Diag), Pr-63 displays100% of the capacitance.
[Main Capacitor Diagnosis details]
Capacitance
Diagnose current
Level
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