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A1120/40 - Electronic Polyphase Meter
©
Elster Metering Limited - M181 001 2G - 5/2010
13.2.6 CT Ratio Programming
The CT ratio can be displayed as a ratio or as a scalar quantity. A count of the number of CT
Ratio reprogramming events to a maximum of 65,535 is recorded together with source (Optical or
RS232 port) and time and date stamps for the three most recent events. The identity of the
programming user is also stored. The count and time and date stamp can be included in the
display sequence.
Note: CT Ratio Reprogramming Events are communications sessions where the primary or
secondary value of the CT has been changed.
An End of Billing Reset can be requested with a CT ratio change.
A CT Programming switch can be fitted as a manufacturing option. The switch must be activated
in order to change the CT ratio. The switch is under the terminal cover and may be protected by a
paper seal.
13.2.7 Watchdog (Transient Reset)
A count of the number of watchdog resets to a maximum of 65,535 is recorded together with time
and date stamps for the three most recent events. The count and time and date stamps can be
included in the display sequence.
13.2.8 In Service Hours
The elapsed time counter records the cumulative time (to a resolution of 1 hour) the meter has
been powered up. The count can be included in the display sequence.
The amount of storage is in excess of 25 years.
13.2.9 Meter
Errors
An alarm can be displayed if an error occurs. The alarm and error message
(See Figure 8, Display table) can be disabled via the Power Master Unit.
Access to the data is via the optical port, the RS232 data port or on the LCD.
A time and date stamp of the three most recent non-fatal error events is recorded where possible.
In the unlikely event that any of the above meter errors occur, a catastrophic failure has been
detected and the meter should be returned to Elster Metering for failure investigation.
13.2.10 Cover Removal Detection
Main Cover
As a manufacturing option the main cover can be fitted with a tamper switch to detect removal.
The number of times the cover has been removed to a maximum of 65,535 is recorded together
with the time and date stamps of the last three occurrences. The count and time and date stamps
can be included in the display sequence.
Note: The main cover removal option is not available when the meter is configured for CT Ratio
Programming Switch.
Summary of Contents for A1120
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Page 3: ...A1120 40 Programmable Electronic Polyphase Meter Chapter 1 Introduction M181 001 1B 5 2009 ...
Page 4: ...Minor Change Record Date Modification 7 5 2009 Format change ...
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Page 53: ...Operating Maintenance Instructions 45 Figure 4 Load Curves ...
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