Machine Diagnosis Function - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

17.5

Machine diagnosis function

Function summary
The failure prediction function is used with servo amplifiers with software version A3 or later. This is available
with MR Configurator2 with software version 1.60N or later.
The machine diagnosis function estimates the friction and vibrational component of the drive system in the equipment based
on the data in the servo amplifier, and detects an error in the machine parts, including a ball screw and bearing. The machine
diagnosis function includes the friction vibration estimation function and the failure prediction function.
Friction vibration estimation function
In the friction vibration estimation function, the friction estimation function estimates the friction of the drive system in the
equipment, and the vibration estimation function estimates the minute vibration level and vibration frequency based on the
data in the servo amplifier. The friction estimation function estimates and detects the static friction (including gravity) of a
guide and ball screw and the dynamic friction coefficient after operation is performed in any operation pattern. The vibration
estimation function estimates and detects the vibration level both during servo motor operation and at a servo motor stop, and
vibration frequency both during servo motor operation and at a servo motor stop after operation is performed in any operation
pattern.
Failure prediction function
The failure prediction function predicts a failure of the equipment from the friction, vibration level during servo motor operation,
and servo motor total travel distance, which are estimated by the friction vibration estimation function. In the failure prediction
function, the friction failure prediction function predicts a failure of the equipment from the estimated friction, the vibration
failure prediction function predicts a failure of the equipment from the estimated vibration level during servo motor operation,
and the total travel distance failure prediction function predicts a failure of the equipment from the servo motor total travel
distance.
How to set the function
Friction estimation function/friction failure prediction function
Use the friction estimation function or the friction failure prediction function with the following procedure. In the friction failure
prediction function, a threshold that outputs a warning can be automatically calculated in the servo amplifier with "Automatic
threshold setting", or set by using parameters with "Manual threshold setting". With the manual threshold setting, you can set
any threshold that outputs a warning.
17 APPLICATION OF FUNCTIONS
17.5 Machine diagnosis function
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