Guideline For Setting The Alarm Threshold Value Of The Comprehensive Current Diagnosis Type (K6Cm-Cim) - Omron K6CM User Manual

3 Mechanism of Measuring and Monitoring of the K6CM Devices
3-1-6 Guideline for Setting the Alarm Threshold Value of
the Comprehensive Current Diagnosis Type (K6CM-CIM)
Refer to the following guideline to set the alarm threshold of the monitored degradation level in the
Comprehensive current diagnosis type (K6CM-CIM).
If the motor and load are abnormal, noise appears in the current waveform as shown below. A value
that expresses this state numerically is the degree of degradation that can be monitored with the
Comprehensive current diagnosis type.
(1) Motor and load are normal.
(2) An abnormality is occurring.
Abnormality affecting degradation level
Shift axis
Load imbalance
Motor insulation error
Rotor abnormality
Cavitation
Overload
Bearing abnormality
Set the alarm threshold of the degradation level according to the actual motor conditions. Without
inverter, set the following setting value to the alarm threshold of the degradation level.
• Degradation level alarm threshold (Warning): 20
• Degradation level alarm threshold (Critical): 50
Note The default value of alarm threshold (Warning) is set to 30, which is the above 20 plus 10.
Initial setting value of the degradation level in the K6CM device
0
Normal Normal Normal
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, add the degradation level measured at the begging of use to the above initial setting
value and set it.
3 - 12
Cross-sectional view of the motor
Smooth rotation
Cross-sectional view of the motor
Abnormal vibration
20
Maintenance required Maintenance required Maintenance required
The current is a smooth "sine wave".
"Noise" may come up in the current.
Major factors
Coupling abnormal, centering shortage, etc.
Unbalance of rotating objects such as fans
Insulation deterioration inside the motor
Breakage inside the motor
Vacuum bubbles in water stream
Excessive rotational load
Bearing breakage
50 100
Critical Critical Critical
K6CM Motor Condition Monitoring Device User's Manual (N219)