41
3.3 Running CHECK MOTOR
On first use of eMCM and each time any maintenance is performed on the motor, it is essential that
the motor together with its connections are checked by running the CHECK MOTOR function. In this
mode eMCM performs a short check on all motor connections to determine the phase ordering and
that a motor is connected and running. It also checks among other things, that the voltage and
current levels are within set limits, and that the phase angle between the V1 and I11 - I12 channels
is appropriate. If eMCM detects that some condition is not met, an alarm is raised which the user
should investigate and remedy before proceeding further.
3.4 Running LEARN and IMPROVE
3.4.1 LEARN
eMCM should learn the motor under normal operating conditions. The LEARN period consists of a
preset number of data acquisition cycles and periods of data analysis. Once the preset number of
cycles has been reached, the acquired and preprocessed data are further processed to produce a
database consisting of a collection of data sets representing the behavior of the motor system under
the load conditions that the motor has met in practice. It is therefore important to have the motor
operating under its expected running conditions during a learning period. In order to adequately
cover the range of load conditions experienced by a motor system, a sufficient number of
acquisition cycles or iterations is required.
We recommend that you use somewhere between 3000 to 4000
iterations as 4000 iterations typically provide adequate coverage
under most load conditions for driven with DOL, Star-DELTA.
Since additional learning can also be performed if needed during the testing phase, a larger number
of learning iterations is not generally required.
3.4.2 IMPROVE
Once the initial learning period is complete, the eMCM unit will automatically try to improve its
estimation of the motor characteristics by updating the database obtained during the learning
mode. The database is updated with different load and line conditions in the Improve mode. The
duration of the Improve mode is determined by the number of Improve iterations set from Set
Settings command.
It is recommended that this value be set to between 8000 – 10000 iterations.
An important difference between this mode and the initial learning period is that eMCM monitors
the motor status during IMPROVE but does not during LEARN.
Once the IMPROVE stage is complete, the MONITOR phase will automatically continue without user
intervention. This is the main operating mode and eMCM is expected to spend most of its time in
this mode monitoring attached motor systems.
To Next Page
Loading...