User Guide SL7000 IEC7
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6.7.6.
Special days
The special days facility is intended to allow energy consumption charges on any locally-significant days, such as
religious or public holidays, to be different from the rest of the week in which they occur.
The meter can accommodate up to 100 entries in an internal special days list. Each entry can be either repetitive
or non-repetitive and have a different day profile (DP) applied.
•
Repetitive
These allow different day profiles to be applied on fixed dates during the year. The same dates will be used
for all subsequent years.
•
Non-repetitive
These allow a different day profile to be applied on a specific day. Each non-repetitive entry is completely
independent and when the last entry is reached it will be necessary to reprogram the meter with new values.
6.8.
Backup power supply
To ensure the real-time clock and the cover opening detector are maintained during periods of power failure, the
meter is equipped with a backup power supply comprising:
•
Light capacitor (serial)
An internal device specified to provide a minimum capacity of 2 hours power outage carry-over period.
•
Super-capacitor (option)
An internal device specified to provide a minimum capacity of 7 days power outage carry-over period.
•
Lithium battery (option)
An optional field-replaceable device, specified to provide a minimum capacity of 3 years continuous
operation at 25°C and a minimum shelf-life of 10 years, with less than 10% loss of capacity due to self-
discharge at 25°C.
During a power failure, the super-capacitor is the first backup device to be drained.
An icon on the LCD is lit when the battery voltage falls below a preset threshold value (nominal battery voltage
value 3V).
The battery can be replaced without any interruption to meter operation.
