Time Of Use Registers; Over Voltage Operation; Power Flow Insensitive Mode; Test Indicator & Anti-Creep - Elster A1100 Operating & Maintenance Instructions

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A1100 - Electronic Polyphase Meter
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TIME OF USE REGISTERS

The time of use input is controlled by an external timeswitch. Where an SO output is not provided,
access is available to both ends of the rate select circuit.
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 a phase conductor
See Figure 5 (auxiliary configurations) for connections to 3 phase 4 wire or 3 phase 3 wire meters.
According to customer requirement the meter can be configured during manufacture as follows:
Option 1
a) Energy stored in Rate 1 register
b) Energy stored in Rate 2 register
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.
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OVER VOLTAGE OPERATION

The meter has been designed to withstand a voltage of √3 x 1.1 Uref (i.e. 440V for 230V meters) for
an indefinite period. When tested over a 12 hour duration the change in meter error was less than
0.4%.
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POWER FLOW INSENSITIVE MODE

Power Flow Insensitive Mode is an optional feature that allows the meter to increment its main kWh
register regardless of whether the meter is measuring import or reverse energy.
When this option is enabled, the pulsing LED indicates identically for both import and reverse.
The Reverse Energy Event Alarm, Reverse Energy Count and Reverse kWh Register respond only to
reverse power flow and continue to function as in normal operation. Power Flow Insensitive Mode is
enabled at time of manufacture.
Note: Power Flow Insensitive Mode may not be allowed in certain countries due to local regulations.
10 TEST INDICATOR & ANTI-CREEP
Test Indicator
A red test output LED is provided which pulses in accordance to the following configurations:
Import only meter - The LED pulses for forward energy only
Import meter with Power Flow Insensitive enabled - The LED pulses for forward and reverse energy
Import/export meter - The LED pulses for forward and export energy
For loads above import and export starting current, this gives 40ms pulses modulated at approximately
8kHz to provide improved detection by electronic meter test equipment.
© Elster Metering Systems - M180 001 1E - 6.2005
Option 2
a) Energy stored in Rate 2 register
or b) Energy stored in Rate 1 register