Journal Limit - Dranetz PowerGuide 4400 User Manual

Journal Limit

Journal entry
settings
Logging data by
limits
Logging data by
time
NOTE
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The 4400 allows power parameters to be trended using periodic readings that are stored
in a journal. Statistical information is always captured regardless of the limit settings,
so users will never be without a trend even if he/she did not set the limits correctly. The
system collects data even when no disturbances occur by recording periodical statistical
data (By Time).
Page 6-16 shows one example of how to set entries under the Standard - Basic
parameter. The same procedure applies when setting entries under other journal
parameters.
Page 6-17 features the list of journal parameters that can be trended.
Limit methods allow users to set the threshold units by which high and low limits of
voltage trigger and current trigger are calculated. Thresholds are set in ranges with high
limit (threshold above the normal range) and low limit (threshold below the normal
range). The following threshold limits are used to trend journal parameters:
Very High: specifies an absolute limit for comparison that is higher than the high limit
High: specifies an absolute limit for comparison that is higher than the low limit
Low: specifies an absolute limit for comparison that is lower than the high limit
Very Low: specifies an absolute limit for comparison that is lower than the low limit
Deadband: specifies how much a value can change before another event is recorded
The Very high must be greater than High, Very low less than Low. Deadbands or
sensitivity is used to record incremental changes in the parameter besides when limits
are crossed. The hysteresis values assigned to limits are fixed and not programmable by
the user. All limit values are used to determine if corresponding reporting or logging
action should take place.
The 4400 is able to measure periodic samples as well as take snapshots of the voltage
and/or current waveform. The Journal Interval menu (see page 6-19) allows users to set
the time of how often the instrument will record power parameter values, demand and
energy, harmonics, and flicker.
Users can record data simultaneously by limits and by time. Make sure to enable the
parameters to trend under Journal Categories and Journal Interval.
www.
CH 6/ Advanced Setup Options
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