6.15 Initializing the Vibration Detection Level
6.15.1 Preparations
6-93
6
Application Function
s
6.15
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.
If the vibration exceeds the detection level calculated with the following formula, an alarm or
warning occurs according to Pn310 (Vibration Detection Selection).
•
Rotary Servomotors
•
Linear Servomotors
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).
6.15.1
Preparations
Check the following settings 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.
0).
Parameter
Meaning
When
Enabled
Classification
Pn310
n.
0
(default setting)
Do not detect vibration.
Immediately Setup
n.
1
Output a warning (A.911) if vibration is detected.
n.
2
Output an alarm (A.520) if vibration is detected.
Pn311
Vibration Detection Sensitivity
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
50 to 500
1%
100
Immediately
Tuning
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 motor is operating at 10% of its maximum speed or faster.
100
Detection level =
Vibration detection level (Pn
3
12 [min-1])
Vibration detection
s
en
s
itivity (Pn
3
11 [%])
100
Detection level =
Vibration detection level (Pn
3
84 [mm/
s
])
Vibration detection
s
en
s
itivity (Pn
3
11 [%])
Speed
Position
Torque
Information
