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GOT Drive Control (Servo) Interactive Solutions
MR-J4
MR-JE
Key
Feature
24
Machine diagnosis function
With the on-site GOT, you can find out the maintenance timing of the equipment drive parts
Challenges
5
How can I predict deterioration of a
machine if it has excessive load and is
frequently accelerated?
Machine diagnosis screen
By switching the
axis number,
multiple axes can
be maintained on
the same screen.
Friction estimation by using the machine diagnosis function
Friction estimation results are obtained when the following conditions are satisfied:
- The machine was operated for 150 seconds or more at a motor rotation speed or
linear servo motor speed equal to or above the value set for parameter [Pr. PF 31].
- The machine was operated for 150 seconds or more at a motor rotation speed or
linear servo motor speed below the value set for parameter [Pr. PF 31].
The value of parameter [Pr. PF 31] is treated as an absolute value. Use a positive
number for operating the machine in the forward rotation direction and a negative
number for operating it in the reverse rotation direction.
In the case of the operation pattern shown in Figure 1, when both (a)+(c) and (b)
are operated in the forward rotation direction for 150 seconds or more, a friction
estimation result can be obtained.
The friction estimation in the reverse rotation direction cannot be obtained because
the speed during the reverse rotation direction operation ((d)) does not exceed the
value of parameter [Pr. PF 31].
Change the value of parameter [Pr. PF 31] and perform the friction estimation.
Also, when the value of the parameter [Pr. PF 31] is 0, the threshold value is the rated
rotational speed or half the rated speed.
* PF31: Machine diagnosis function - Friction judgment speed
* For the details of the machine diagnosis function, please refer to MR Configurator2 Help.
42
No.
Function
1 Machine diagnosis function
Solutions
GOT can display estimated values (machine friction, torque vibration, etc.) that are collected by
the machine diagnosis function of the servo amplifier. The difference between the initial value
(at the startup) and the current value can be used to predict deterioration of the machine. Using
this function with the GOT's alarm function will help you perform timely maintenance of machine
parts.
Machine before operation
Displays the estimated value upon
completion of the machine
diagnosis. When any of the
estimation values exceed the
threshold values that are set on the
GOT, the numerical value display
area turns red.
Save estimation values to a file and compare the values to check the deterioration of the machine.
MR-J5-G(-RJ)
MR-J5D1-G4
MR-J5W2-G
MR-J5D2-G4
MR-J5W3-G
MR-J5D3-G4
—
—
* Supported by MR-J4-B(-RJ), MR-J4W2-B, MR-J4W3-B, MR-JE-B only. See page 16 for details.
Descriptions of items on the machine diagnosis screen
Item
Detect the estimated static friction (coulomb friction) (including gravity
Estimated friction
and etc.) and dynamic friction (viscous friction) coefficient of guides or
value
ball screws according to the operation patterns.
Friction torque
Friction in operation at the rated speed.
at rated speed
The value indicates the ratio (%) against the rated torque.
(%)
The value increases as the machine deteriorates.
Regardless of the motor speed, a constant value is applied to friction.
Static friction
When an object begins to move, the torque must be greater than or
(coulomb friction)
equal to the static friction (coulomb friction) torque. The value indicates
(%)
the ratio (%) against the rated torque. The value increases as the
machine deteriorates.
The vibration estimation function observes the torque vibration and
estimates the vibration level and the vibration frequency of high-frequency
Vibration
micro vibrations. This function allows checking of the increase of vibration
estimation
level and the change in the vibration frequency that are caused by
deterioration of a guide, a ball screw, a belt, etc. due to age.
Oscillation
Frequency of torque vibration when a machine vibrates during operation or
frequency
when it is not operating. The value indicates the frequency when the machine
(Hz)
oscillates due to a cause such as deterioration of the machine due to age.
Torque amplitude when a machine vibrates during operation or when it is
Vibration level
not operating. The value indicates the ratio (%) against the rated torque.
The value increases as the machine oscillation increases due to a cause
(%)
such as deterioration of the machine due to age.
Speed
Forward rotation
direction
Parameter
PF31
−(Parameter
PF31)
Reverse rotation
direction
MR-J5-B(-RJ)
MR-J4-B(-RJ)
MR-J4-
MR-J5W2-B
MR-J4W2-B
A(-RJ)
MR-J5W3-B
MR-J4W3-B
—
SoftGOT
GT27
GT25
GT21
(Single-ch)*
Sample
Predictive
End user
screen
maintenance
Guide deterioration?
Belt loosened?
Vibration increased after starting operation
Description
(d)
(a)
(b)
(c)
Figure 1. Servo amplifier operation speed
: Supported —: Not supported
MR-J4-
MR-JET-
MR-JE-
MR-JE-
GF(-RJ)
G
B
—
SoftGOT
(Multi-ch)
Maintenance
Time
MR-JE-
A
C
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