Aclara SGM1400 Series, Руководство пользователя

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S G M 1 4 0 0 S e r i e s S m a r t M e t e r U s e r M a n u a l – S M E T S 2
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Chapter 6 • Advanced Features
Overheating
The overheating event feature is application- and customer-specific.
Tamper Detection
The SGM1400-B meter has the capability to open the load switch when detecting
a tamper condition.
Arming and Disarming
The SGM1400-B Series meters support a supply arming function to provide a
safer means of reconnecting supply to a premise, especially when activating
supply remotely. The meter can be armed or disarmed locally or remotely;
however, supply will not be connected to the premise until the reconnection
buttons are physically pressed on the meter. An end user can access the physical
reconnection button without requiring an authorized technician.
When the meter is in the armed state, the LCD icon for the particular contactor
will blink indicating that the contactor is open but armed. When the reconnection
buttons are pressed on the meter, the main supply contactor will close for supply
to be reconnected to the premise. The arming state can be canceled locally via the
optical port or remotely via the AMI interface.
Auxiliary Load Relay
The SGM1412-B and SGM1416-B meters contain a 2 A voltage-free contact relay
to allow switching of an external contactor. The 2 A relay can be controlled
remotely or scheduled to open or close at specific times of the day to control
auxiliary loads such as water or under-floor heating. An LCD segment indicates if
the 2 A relay is connected (see Display on page 10).
Real-Time Clock
All SGM1400-B Series meters have an internal clock mechanism to maintain the
time and date. There are two time base options: line frequency based time and
crystal oscillator based time.
N
OTE
Time accuracy will not be affected by high or low voltage operation,
regardless of whether the time is being maintained by line frequency or
crystal oscillator.
The crystal oscillator based time mechanism is based on an internal 32.768 kHz
crystal oscillator. The crystal oscillator is used to maintain the meter time when
the supply voltage is not present or when the meter is configured to use oscillator
based time.
If the meter is configured to use the line frequency based synchronization, the
meter will switch to crystal based time when the main supply is unavailable (i.e.,
the meter is powered down). The time keeping method will revert to line
synchronization upon the supply being re-energized.