Manual Gossen Metrawatt MAVOWATT 20 (page 127 of 228) (English)

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6-8

Journal Limit

Journal entry

settings

Energy Platform 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 6-9 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 6-10 features the list of journal parameters that can be trended.

Logging data by

limits

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 H i gh

: 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 L ow

: 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.

Logging data by

time

Energy Platform is able to measure periodic samples as well as take snapshots of the

voltage and/or current waveform. The Journal Interval menu (see page 6-12) allows

users to set the time of how often the instrument will record power parameter values,

demand and energy, and harmonics.

NOTE

Users can record data simultaneously by limits and by time. Make sure to enable the

parameters to trend under Journal Limit and Journal Interval.

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Gossen Metrawatt MAVOWATT 20 Manual

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