Omron K6CM User Manual page 65

With an inverter, the influence of the inverter control appears in the current waveform.
The degradation level will be measured to be larger than the actual value.
Therefore, shift the above initial setting value in the degradation level measured in a new product or
the normal condition after overhauling before use.
Inverter Operation: 100%
Example of actual measurement:
Initially measured value of the
degradation level is "51".
Note The level of degradation may vary when the motor is driven by the inverter. In that case, slightly shift the
inverter drive frequency.
Also always measure and monitor the level of degradation at the same inverter drive frequency.
Mount a dedicated CT between the motor and the inverter.
K6CM Motor Condition Monitoring Device User's Manual (N219)
3 Measuring and Monitoring Mechanism
Example:
The degradation level measured at the beg-
ging of use is "51" due to the influence of
inverter control. However, it is not abnormal.
In this case of using an inverter, this initially
measured value "51" should be added to the
alarm threshold.
Therefore, alarm threshold of degradation
level (Warning) should be "71" that is added
"20" to this value. One of degradation level
(Critical) should be "101" that is added "50" to
this value. Perform trend monitoring after
these settings.
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