[Al. 0F7_Machine Diagnosis Warning] - Mitsubishi Electric Melservo-J5 MR-J5 Series User Manual

[AL. 0F7_Machine diagnosis warning]

• The equipment on which the servo motor is installed may be malfunctioning.
[AL. 0F7.1_Vibration failure prediction warning]
Cause
1.
Due to degradation of components in the
equipment, the vibration became larger.
2.
The servo system is unstable and oscillating.
[AL. 0F7.2_Friction failure prediction warning]
Cause
1.
Due to degradation of components in the
equipment, the friction of the equipment
changed.
2.
As the surrounding environment changed, the
friction of the equipment also changed.
[AL. 0F7.3_Servo motor total travel distance failure prediction warning]
Cause
1.
The servo motor total travel distance has
exceeded the threshold.
[AL. 0F7.4_Gear failure prediction warning]
Cause
1.
Gear abrasion made the backlash larger.
2.
The value for the backlash estimation was set
incorrectly.
Check/action method
When the increase in the vibration level during motor operation is less than 5
% of the rated torque from the initial operation, set a larger value for vibration
failure prediction threshold multiplication, and then restart the equipment.
[A]: [Pr. PF52.1 Vibration failure prediction - Threshold multiplication]
[G] [WG]: [Pr. PF40.1 Vibration failure prediction - Threshold multiplication]
When the increase in the vibration level during motor operation is equal to or
more than 5 % of the rated torque from the initial operation, perform an
inspection and maintenance of the equipment as necessary.
Check if the gain is changed after the vibration failure prediction function is
activated. Adjust the servo gain with the auto tuning. Set the machine
resonance suppression filter.
Check/action method
If the friction torques are the same at the initial operation and at the rated
speed, set a larger value for vibration failure prediction threshold multiplication,
and then restart the equipment.
[A]: [Pr. PF52.1 Vibration failure prediction - Threshold multiplication]
[G] [WG]: [Pr. PF40.1 Vibration failure prediction - Threshold multiplication]
If the friction torque at the rated speed changed from the initial operation,
perform an inspection and maintenance of the equipment as necessary.
If the operating environment, such as the ambient temperature, was changed
from the initial operation, reset the threshold, and then re-create the threshold.
Check/action method
Check if the threshold is set correctly.
If the threshold value is incorrect, set each servo parameter so that the setting
value of the servo motor total travel distance will be an approximation of the
rated life, and then restart the device.
[A]: [Pr. PF53 Failure prediction - Servo motor total travel distance]
[G] [WG]: [Pr. PF41 Failure prediction - Servo motor total travel distance]
If the threshold setting is correct, perform an inspection and maintenance of
the equipment.
Refer to "Total travel distance failure prediction function" in the following
manual.
MR-J5 User's Manual (Function)
Check/action method
Compare the backlash estimation value with the backlash presented by the
gear manufacturer. If the backlash estimation value is larger than the backlash
presented by the gear manufacturer, perform an inspection and maintenance
of the equipment.
Set [Pr. PF66.0-3 Gear ratio for backlash estimation - Numerator] and [Pr.
PF66.4-7 Gear ratio for backlash estimation - Denominator] to the same value
as the gear ratio of the gear connected to the servo motor.
Check that [Pr. PF67 Backlash nominal value] is equivalent to the value shown
by the manufacturer of the gears connected to the servo motor.
When setting "0" for [Pr. PF66.0-3] or [Pr. PF66.4-7], set [Pr. PF67] by
converting the value into the rotation angle on the servo motor side.
When setting other than "0" for [Pr. PF66.0-3] and [Pr. PF66.4-7], set [Pr.
PF67] by converting the value into the rotational load on the load side.
Set [Pr. PF68 Backlash threshold multiplication] to a value more than two
times larger.
1 SERVO AMPLIFIER TROUBLESHOOTING
1.3 Handling methods for alarms/warnings
1
Model
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[G]
[WG]
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[A]
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[WG]
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[A]
[G]
[WG]
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[WG]
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