Machine Diagnosis - Mitsubishi Electric MELSERVO-J5 MR-J5 Series User Manual

4.5

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 detects errors in machine parts such as ball screws and bearings. The machine
diagnosis function features the following functions:
Diagnosis target Diagnosis item
Linear guide Static friction/
Ball screw dynamic friction
Servo motor vibration
torque
Servo motor Motor total travel
Equipment parts distance
Gear Backlash value
Belt Belt tension
Diagnosis function Outline
Friction estimation function The friction estimation function estimates and detects the
static friction (including gravity) and the dynamic friction
of guides and ball screws after operation is performed in
any operation pattern.
Friction failure prediction The friction failure prediction function predicts device
function failure based on the friction estimated by the friction
vibration estimation function.
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.
Vibration failure prediction The vibration failure prediction function predicts device
function failure based on the vibration level that has been
estimated with the vibration estimation function during
servo motor operation.
Total travel distance failure The total travel distance failure prediction function
prediction function predicts failures of the equipment and the servo motor,
based on the servo motor total travel distance.
Backlash estimation function The backlash amount of the gear connected to the servo
motor is estimated from the servo motor drive status.
Gear failure diagnosis Gear failure is predicted based on the estimated
function backlash amount.
Friction failure prediction For the static friction failure prediction function, the
function deterioration in belt tension is predicted by the increase/
decrease of the static friction estimated by the friction
estimation function.
Belt tension deterioration The belt tension deterioration prediction function
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 178
Friction vibration
estimation
function
Page 184
Friction failure
prediction function
Page 178
Friction vibration
estimation
function
Page 195
Vibration failure
prediction function
Page 201
Total travel
distance failure
prediction function
Page 208
Gear failure
diagnosis function
Page 208
Gear failure
diagnosis function
Page 215 Belt
diagnosis function
Page 215 Belt
diagnosis function
4 APPLICABLE FUNCTIONS
4.5 Machine diagnosis
4
177