6 Utility Functions (Fn)
6-26
6.16 Vibration Detection Level Initialization (Fn01B)
This function detects vibration when servomotor is connected to a machine in operation and automatically
adjusts the vibration detection level (Pn312) to output more exactly the vibration alarm (A.520) and the vibra-
tion warning (A.911).
The vibration detection function detects vibration elements according to the motor speed.
If the vibration exceeds the detection level calculated by the following formula, the alarm or warning will be
output according to the setting of vibration detection switch (Pn310).
• Use this function if the vibration alarm (A.520) or the vibration warning (A.911) is not output correctly
when a vibration at the factory setting of the vibration detection level (Pn312) is detected. In other cases, it
is not necessary to use this function.
• The vibration alarm or warning detection sensibility differs depending on the machine conditions. In this
case, fine-tune the setting of the vibration detection sensitivity (Pn311) using the above detection level for-
mula as a guide.
(1) Preparation
The following conditions must be met to initialize the vibration detection level.
• The write prohibited setting parameter (Fn010) must be set to Write permitted (P.0000).
• The test without a motor function must be disabled (Pn00C.0 = 0).
(2) Operating Procedure
Use the following procedure.
Parameter Meaning When Enabled Classification
Pn310
n.0
[Factory setting]
Does not detect vibration.
Immediately Setup
n.1
Outputs the warning (A.911) when vibration is
detected.
n.2 Outputs the alarm (A.520) when vibration is detected.
Pn311
Vibration Detection Sensitivity
Classification
Setting Range Setting Unit Factory Setting When Enabled
50 to 500 1% 100 Immediately Tuning
• The vibration may not be detected because of improper servo gains. Also, not all
kinds of vibrations can be detected. Use the detection result as a guideline.
• Set a proper moment of inertia ratio (Pn103). Improper setting may result in the vibra-
tion alarm, warning misdetection, or non-detection.
• The references that are used to operate your system must be input to execute this
function.
• Execute this function under the operating condition for which the vibration detection
level should be set.
• Execute this function while the motor speed reaches at least 10% of its maximum.
Detection level =ޓ
Vibration detection level (Pn312 [min
-1
])× Vibration detection sensitivity (Pn311 [%])
100
Step Display after Operation Keys Operation
1
Press the Key to view the main menu for the
utility function.
Use the or Key to move through the list and
select Fn01B.
RUN − FUNCTION−
Fn014:Opt Init
Fn01B:Viblvl Init
Fn01E:SvMotOp ID
Fn01F:FBOpMot ID
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