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5.26 Initializing the Vibration Detection Level
5.26.1 Preparations
5.26
Initializing the Vibration Detection Level
You can detect machine vibration during operation to automatically adjust the settings of
Pn312 or Pn384 (Vibration Detection Level) to detect A.520 alarms (Vibration Alarm) and A.911
warnings (Vibration Warning) more precisely.
This function detects specific vibration components in the Servomotor speed.
Pn310
If the vibration exceeds the detection level calculated with the following formula, an alarm or
warning occurs according to Pn310 (Vibration Detection Selections).
• Rotary Servomotors
Detection level =
• Linear Servomotors
Detection level =
Use this function only if A.520 or A.911 alarms are not output at the correct times when vibra-
tion is detected with the default vibration detection level (Pn312 or Pn384).
There will be discrepancies in the detection sensitivity for vibration alarms and warnings
depending on the condition of your machine. If there is a discrepancy, use the above formula to
adjust Pn311 (Vibration Detection Sensitivity).
Pn311
Information
5.26.1 Preparations
Always check the following before you initialize the vibration detection level.
• The parameters must not be write prohibited.
• The test without a motor function must be disabled (Pn00C = n.
5-80
Parameter
n.
0
Do not detect vibration.
(default setting)
n.
1
Output a warning (A.911) if vibration is detected.
n.
2
Output an alarm (A.520) if vibration is detected.
Vibration detection level (Pn 12 [min
Vibration detection level (Pn 84 [mm/ ]) × Vibration detection en itivity (Pn 11 [%])
Vibration Detection Sensitivity
Setting Range
50 to 500
1. Vibration may not be detected because of unsuitable servo gains. Also, not all kinds of
vibrations can be detected.
2. Set a suitable moment of inertia ratio (Pn103). An unsuitable setting may result in falsely
detecting or not detecting vibration alarms or vibration warnings.
3. To use this function, you must input the actual references that will be used to operate your
system.
4. Execute this function under the operating conditions for which you want to set the vibra-
tion detection level.
5. Execute this function while the Servomotor is operating at 10% of its maximum speed or
faster.
Meaning
-1
]) × Vibration detection en itivity (Pn 11 [%])
100
100
Setting Unit
Default Setting
1%
100
When
Classification
Enabled
Immediately
Setup
Torque
peed
Po ition
Classifica-
When Enabled
tion
Immediately
Tuning
0).
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