GE Industrial Solutions AMP1H5 - Manual (Page 22)

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AMP1H5 INSTALLATION GUIDE
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DATA LOGGING
The AMP1H5 includes a data logging feature that records three meter parameters, accessible via BACnet using Trend_Log objects. All three Trend_Log objects utilize shared
data logging resources in the meter, so all three are controlled in unison. All writable properties other than Log_Device_Property_Object are common to all three Trend_Log
obects. Changes to these properties (Log_Enable, Start_Time, Stop_Time, Log_Interval, Stop_When_Full or Record Count) for any one of the objects will be reflected in
the corresponding property of all three objects. The Log_Interval property is also common with the Demand_Subinterval (Present_Value of AV11), since logging records are
updated synchronously with demand calculations.
Default settings cause logging to begin immediately, with 15 minute intervals and no stop time. When full, the buffer wraps and overwrites the oldest data first (unless the
Stop_When_Full property is used).
Configuration:
Use Log_Device_Object_Property to select the meter parameter to log with each object. Set this property to point to Present_Value property of any of the Analog_Input
objects. The default the values for the Log_Device_Object_Property of the three Trend_Log objects are set as follows:
• TL1 = Real Energy Consumption (AI1 Present_Value)
• TL2 = Reactive Energy Consumption (AI27 Present_Value)
• TL3 = Total Real Power Present Demand (AI34 Present_Value)
The Log_Interval (& Demand Subinterval) can be set from 10 seconds to 32767 seconds (values of 1000 to 3276700). The subinterval timer, which determines how often the
meter’s demand accumulators are updated, also triggers writing to the Trend_Log log buffers. Use the Log_Interval property to set the data logging time subinterval, in units
of hundredths of a second (0.01 seconds). The default subinterval is 15 minutes (a value of 90000 in the Log_Interval property). The Buffer_Length is fixed at 5760, so at a 15
minute interval setting, the buffers hold 60 days of data.
Use the Stop_When_Full property to select either Single Shot (Stop_When_Full = TRUE) or Continuous mode (Stop_When_Full = FALSE) for data logging. The default mode
is Continuous. In Single Shot mode, the meter records data only until the buffer is full. Data for this time period is kept, but newer energy information is lost. In Continuous
mode, the meter continues to record energy data as long as the meter is operating. The buffer can only hold 5760 entries at one time, however, so when the number of records
exceeds 5760, the oldest entry is deleted to make room for the newest.
To start data logging with any of the three Trend_Log objects, set the Log_Enable property to TRUE or set the Start_Time and Stop_Time properties appropriately and wait
for logging to commence at Start_Time.
By default, the Record_Count property of the Trend_Log objects is initialized to Zero.
Reading Data:
Access logged data with corresponding timestamps via the Log_Buffer property of the Trend_Log object using the BACnet ReadRange service. The AMP1H5 supports both the
“by Position” and “by Sequence Number” modes of the ReadRange service, but not the “by Time” mode.
Trend_Log Objects
Trend_Log Properties
Used
R/W Units Additional information
Object_Name R Trend_Log_<n> Where n is 1-3 (there are three instances of Trend_Log objects available)
Description R Trend_Log <n> Where n is 1-3 (there are three instances of Trend_Log objects available)
Log_Enable W Binary Set this to TRUE to enable logging or FALSE to disable logging. The default is TRUE.
The value is set to FALSE internally if logging stops for other reasons (i.e. buffer is full).
Start_Time W Date/Time Sets the Date/Time when data logging will Start (if Log_enable is TRUE). Set to a Date/Time earlier
than the Local_Date/Local_Time properites of the Device object and Set Log_Enable TRUE to start
logging immediately.