Daylight Savings; Independent Day Control - Elster A1140 User Manual

18
A1120/40 - Electronic Polyphase Meter
Auto Reset initiates a Billing Reset every midnight. When Auto Reset is enabled there is an
option to inhibit the reset of the Maximum Demand Registers.
A message that a Billing Reset has been initiated is displayed with a code showing the cause of
the reset (See Figure 8, Display Table).
At each Billing Reset the oldest of the fifteen historical data records is overwritten. Time and date
stamps, together with causes are stored for the last three End of Billing events.
End of Billing Lock-out
A further End of Billing can be inhibited via the Power Master Unit for either:
- Up to 255 minutes
- Until the next midnight boundary
Note: This only inhibits instantaneous end of billing requests, either via the pushbutton or
communications setting, not programmed End of billing events.
11.7

Daylight Savings

The meter provides 2 Daylight Savings dates whereby the clock can be advanced by one or two
hours at the start of the summer and can be retarded by one or two hours at the end of the
summer.
The day on which a Daylight Saving occurs is programmable, with the choice of the first, second,
third, fourth or last specified weekday in a specified month.
The algorithm used will identify the correct calendar dates for the next 50 years.
All of the following will reflect Daylight Savings:
Automatic End of Billing
Switching times within the tariff definition
Time and date stamps (For firmware Version C meters, daylight savings time and date stamps
can be referenced to base time or daylight savings time)7.
Optionally load profile (A1140 only)
11.8

Independent Day Control

The meter has the facility to have a different switching program consisting of several switching
times running on different days of the week. An example of a switching program is below.
Mon Tue Wed Thu
© Elster Metering Limited - M181 001 2G - 5/2010
Fri Sat
1 2
Sun
3 Switching programs