Conditions To Use - Omron K7DD User Manual

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Conditions to Use

The conditions to use are as follows:
•
The user can operate the K7DD while the device is in operation.
•
Normal average value can be obtained under the condition that the product is considered to be
normal, such as immediately after maintenance/inspection or when it is brand new.
•
The device is specified to operate standalone in its operating conditions.
•
The device operates in a constant cycle.
•
The appropriate feature calculation cycle has been set according to the device operation. The
following shows examples.
Example 1) A device that does not stop the motor before or after a cycle
Device example: End milling with processing machine
Set the time per cycle t including start/end as the feature calculation cycle.
Frequency
R.M.S. current
Example 2) A device that stops the motor before or after a cycle
Device example: Deep hole drilling with processing machine
Set 1/3 to 1/2 of the operation time per cycle t as the feature calculation cycle.
Frequency
0
R.M.S. current
0
Unsuitable Error Modes and Applications
The following lists the error modes and applications for which the simplified threshold setting function is
not suitable.
•
Instantaneous errors
Errors that appear in a shorter time than the feature calculation cycle may prevent proper detection of
feature values.
•
Applications where errors cause a drop in voltage, current, or power
If the load on the device or the motor torque drops, detection of feature values may not be possible.
Power Line Data Generator User's Manual (N233)
The motor rotates at constant speed
Cycle (1)
0
Machining
Machining
Idling
Idling
0
Time/cycle: t
Stop Rotate Stop
Cycle (1)
Machining
Operating time/cycle: t
Cycle (2) Cycle (3)
Machining
Idling
Rotate Stop Rotate Stop
Cycle (2) Cycle (3)
Machining Machining
4 K7DD Function
Time
Time
Time
Time
4
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