Machine Diagnosis - Mitsubishi Electric MR-J5 Series User Manual

4.3

Machine diagnosis

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 recognizes an error in the machine parts, including a ball screw and bearing. The
machine diagnosis function features the following functions:
Diagnosis target Diagnosis item
Linear guide Static friction/Dynamic
Ball screw friction
Servo motor vibration
torque
Servo motor Motor total travel
Equipment parts distance
Gear Backlash value
Belt Belt tension
4 APPLICABLE FUNCTION
128
4.3 Machine diagnosis
Diagnosis function
Friction estimation function
Friction failure prediction
function
Vibration estimation function
Vibration failure prediction
function
Total travel distance failure
prediction function
Backlash estimation function
Gear failure diagnosis function
Friction failure prediction
function
Belt tension deterioration
prediction function
Outline
The friction estimation function estimates and detects the
static friction (including gravity) of a guide and ball screw
and the dynamic friction after operation is performed in
any operation pattern.
The friction failure prediction function predicts device
failure based on the friction estimated by the friction
vibration estimation function.
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.
The vibration failure prediction function predicts device
failure based on the vibration level that has been
estimated with the vibration estimation function during
servo motor operation.
The total travel distance failure prediction function
predicts failures of the equipment and the servo motor,
based on the servo motor total travel distance.
The backlash amount of the gear connected to the servo
motor is estimated from the servo motor drive status.
Gear failure is predicted based on the estimated
backlash amount.
For the static friction failure prediction function, the
deterioration in belt tension is predicted by the increase/
decrease of the static friction estimated by the friction
estimation function.
The belt tension deterioration prediction function
estimates the belt tension from the servo amplifier
internal data and predicts when the belt tension is below
the set threshold using the belt tension servo parameter.
Detailed
explanation
Page 129
Friction
vibration
estimation
function
Page 135
Friction failure
prediction
function
Page 129
Friction
vibration
estimation
function
Page 144
Vibration
failure
prediction
function
Page 151
Total travel
distance
failure
prediction
function
Page 158
Gear failure
diagnosis
function
Page 158
Gear failure
diagnosis
function
Page 164
Belt diagnosis
function
Page 164
Belt diagnosis
function