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3.6 Metering and status
Metering
The control has the capability of displaying measured and calculated secondary quantities
and calculated primary quantities.
Secondary
The display will show local voltage, source voltage, compensated voltage, line frequency,
and load current in secondary quantities along with load power factor. The voltage is
displayed on a 120 V base and the current is displayed on a 200 mA base.
The local voltage displayed will not match the voltage measured at the test
terminals on the adapter panel if a sensing VT ratio correction other than
0.0 V has been entered.
Primary
In order to use the calculated primary quantities feature, the user must enter the following
data in the Configuration Menu:
• Select line-to-line or line-to-ground VT configuration.
• Select single-phase quantities based on measured inputs, or three-phase quantities
based on measured inputs and assume a balanced system.
• Select primary voltage and current multipliers needed to calculate primary quantities.
Present Demand
The Present Demand metering capability provided in the control follows the concept of a
lagged demand meter. The demand time interval is selected by the user as 5, 10, 15, 30 or
60 minutes. This is the time it takes for a thermal meter to indicate 90% of a change in load.
Energy Metering
The Energy Metering function of the control displays the following measured values:
• Total Lagging VAr Hours (KVArh, MVArh or GVArh)
• Total Leading VAr Hours (KVArh, MVArh or GVArh)
• Total Reverse Watt Hours (KWh, MWh or GWh)
• Total Forward Watt Hours (KWh, MWh or GWh)
The measured values are retained in non-volatile memory. A real time clock is utilized to
record a date/time stamp for each quantity to indicate when the period of measurement
was initiated.
Section 3
1VAC388793-MB A
Operation
56 TCC300
User Manual