System Setup
9 - 213
9.21.1.2 Diagnose by the torque average value
• Diagnosis Element
Monitors the torque waveform during the JOB operation, and calculates the average
value of the vibration amplitude by extracting the waveform from the torque arising from
the speed reducer. This data is called the torque average value, and it is the basis data
to diagnose the lifetime. The following chart shows the lifetime curved line according to
the torque average value and the operation hours.
As the condition of the speed reducer is changing to “deterioration” from “normal operation”,
the torque element changes to “increase” from “normal”. It is estimated that the speed
reducer is in the deterioration period as the number of the torque element is increasing by
the deterioration of the speed reducer.
This function records the torque element arising from the deterioration of the speed reducer
on a daily basis, and diagnoses the lifetime of the speed reducer by monitoring the change
of the torque element.
By operating a JOB in the PLAY mode, a data (the torque element arising from the
deterioration of the speed reducer) for each axis is recorded automatically on a daily basis,
and the data is accumulated.
When the difference value between the latest value (the average value from the measured
result of the five days (the initial value) including the day to diagnose) and the average value
(the average of 30 days (the initial value) between prior to 60 days from the day to diagnose
and prior to 90 days from the day to diagnose) becomes the threshold value or more, it
determines the speed reducer is almost failure, and outputs the warning. The average value
is indicated with%, and 100% indicates the standard torque.
Lifetime curved line
Torque average value
Started operation
Lifetime curved line
Failure
Running in
Normal operation
Deterioration
Operation hours
Torque
Speed
Torque and speed at the normal
operation period.
Torque and speed at the deteriora-
tion period.
1
1
2
3
4
5
6 7
8
2
3
4
5
6
7
8
1
1
2
3 4
2
3
4
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