8 A100C - BS Single Phase Electronic Meter
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7 TIME OF USE REGISTERS
One or two rate meters are available. The rate select for a two rate meter is controlled by
an external timeswitch.
The contacts operate as follows:
a) External switch contacts open - rate select terminal open circuit
b) External switch contacts closed - rate select terminal connected to neutral
According to customer requirements specified prior to manufacture, the effect of these two
conditions is as follows:
Option 1 Option 2
a) Energy stored in Rate 1 register a) Energy stored in Rate 2 register
b) Energy stored in Rate 2 register or b) Energy stored in Rate 1 register
7.1 Rate Change Lockout
Following a successful rate change, further rate changes are held off for a 10 minute
period.
To aid testing the meter, this mechanism is inhibited for either 1 minute or 1 hour
(configured at manufacture) after power up to allow any external rate select devices to be
tested.
8 OVERVOLTAGE OPERATION
The meter has been designed to withstand a voltage of √ 3 x Uref (i.e. 400V for 230V
meters, 208V for 120V meters) for an indefinite period. When tested over a 12 hour
duration, the application of 400V on a 230V meter caused permanent registration error
changes of less than 0.4%.
9 POWER FLOW INSENSITIVE MODE
Power Flow Insensitive Mode is a security feature that allows an import only meter to
increment its main kWh registers regardless of whether the meter is importing or exporting
energy.
When this option is enabled, the pulsing LED indicates identically for both import and
export. The Reverse Energy Event Flag, Reverse Energy Counts and Reverse kWh
Register respond only to reverse (export) power flow and continue to function as in normal
operation. Power flow Insensitive Mode is enabled at time of manufacture.
© Elster Metering Limited - M130 300 2C - 5.2007
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