Guide For Setting Alarm - Omron K6CM User Manual

3 Measuring and Monitoring Mechanism
3-3-4

Guide for Setting Alarm

Vibration & Temperature Type (K6CM-VBM)
For the Vibration & temperature type (K6CM-VB), the threshold setting method differs depending on the
monitored object (i.e., acceleration, velocity) as follows.
Monitoring By Acceleration
In acceleration monitoring, you can generally monitor the bearing wears.
There are two threshold setting methods in accordance with the state of the motor.
Monitoring by relative value
Monitor by relative value is used when it can be determined that there is no abnormality in the motor
(new or overhauled).
Set the alarm threshold value referring to the table below based on the initial value that is set after
installation.
Warning
Critical
Monitoring by absolute value
Monitor by absolute value is used when the motor status is unknown.
The threshold guide value is determined from the shaft diameter D [mm] of the motor to be moni-
tored and the rotation speed N [rpm].
Refer to the figure below and set the alarm threshold.
100
10
1
0.1
0.01
0
The default value of the alarm threshold is set as follows.
• Alarm threshold (Warning): 0.5 G
• Alarm threshold (Critical): 1.0 G
When the motor capacity is set to 11 kW, the shaft diameter is 42 mm, and when the 4 pole motoris
are directly put in the power supply (60 Hz), the rotation number is 1800 rpm. 42 mm × 1800 rpm =
4
7.56 × 10 . Based on this result of the formula, the figures are set as rounded values.
3 - 18
Alarm
3 to 5 times the initial value after installation
More than 5 times the initial value after installation
2 4 6 8
Shaft diameter D [mm] X Rotation speed N [rpm]
Criteria
C Area: Critical
B Area: Warning
A Area: Normal
10 12 14 16
K6CM Motor Condition Monitoring Device User's Manual (N219)
Warning
Critical
18 20
4
×10