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4.2
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
Diagnosis item
target
Linear guide
Static friction/
Ball screw
dynamic friction
Servo motor
vibration torque
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) and the
dynamic friction of guides and ball screws 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.
• If the vibration frequency is extremely low or high, vibration estimation cannot be performed. For example,
low frequency vibrations of several 10 Hz cannot be detected on a low rigidity machine.
• When there is vibration with multiple frequencies at the same time, such as multiple mechanical
resonances, the vibration frequency may not be estimated properly.
• Vibration frequency may not be estimated properly if the torque reaches the limit value. To prevent the
excessive torque vibrations, set a longer acceleration/deceleration time for the command, or slightly
decrease the gains.
Precautions
• It is recommended that the values estimated by the friction vibration estimation function be saved at the start of operation.
By comparing the value estimated by the friction vibration estimation function after the start of operation and with the value
at the start of operation, how much the machine is aged after operation can be learned, which is useful for preventive
maintenance.
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.
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.
Detailed
explanation
Page 85
Friction vibration
estimation function
Page 85
Friction vibration
estimation function
4 APPLICABLE FUNCTIONS
4.2 Machine diagnosis
4
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