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5 Threshold levels settings
Set the threshold levels using the before and after data collected.
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K6CM-CI (Comprehensive current diagnosis type)
(1)
Open the CSV file to graph the results.
(2) Set the trigger function, and perform measurement in a stable state
When load fluctuations occur at specific times, check the timing when the motor’s load fluctuates and take the
measurement when the motor is in a stable state.
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Trigger Function
The measured values may vary in conditions such as those in the table below. Perform measurement of a stable state
using the trigger function.
Example
Possible correction
Status change
• Change in rotational frequency
• Work change
• Set a trigger so that measurements are taken
at a set state
Load fluctuation
•
Between a number of seconds after
starting the equipment
•
Between a number of seconds after
stopping the equipment
•
Set power ON/OFF as a trigger, and set the
number of seconds until stabilization as the
monitoring delay time.
Measurements in a stable state
If the motor’s load is fluctuating, the measurement results will vary greatly. In the worst case, use measurement
data taken at a fixed load state (stable state) and maintained for some seconds (sampling time x 2). (The sampling
time differs by model.) Use the trigger function and monitoring delay time. See the User’s manual (N219).
(3) Set the moving average times, and suppress variations in measured values
If there is a great variation constantly, there may be a variation in measurement results due to noise and short-cycle
vibration inherent to the equipment. Set the moving average times, and decrease variations.
Load fluctuation
Degradation
Load fluctuation
0
10
20
30
40
0
5
10
15
20
25
Time (min.)
0
10
20
30
0
10
20
5
10
0
0.2
0.4
0.6
0.8
1.0
Current value [A]
Degradation
Time (min.)
Time (min.)
Stable status of equipment
Recommended measurement interval
Installation load fluctuations
