Typical AC voltage APS terminal wiring illustrated below:
Alternatively, the APS also accepts an external DC voltage ranging from 48V to 145V.
Typical DC voltage APS terminal wiring illustrated below:
Note 1: There is no polarization for DC APS (we can connect +Ve on terminal 14 and –Ve on terminal 15.
Note 2: When the meter is only supplied by APS (3 phases cut), information relative to the angles between
phases (voltage) displayed on LCD are not pertinent.
6.4. Power-fail operation
In the event of a continuous absence of power, all SL7000 meter data is saved in a non-volatile memory, with a
retention time of at least 10 years without the aid of any backup power.
The contents of the non-volatile memory are regularly checked with checksum markers and a fatal alarm ( 68) is
raised if data corruption is detected.
6.5. Real-time clock
The meter incorporates a Real-Time Clock (RTC) to facilitate time- and date-based energy rate switching,
interval measurement and time stamping of events.
The RTC can be configured to use either the mains supply or an integral quartz crystal as its default frequency
reference. Where the mains supply is used, the RTC will automatically be maintained during periods of power
failure by the quartz crystal powered from the meter's lithium battery or super-capacitor.
The quartz crystal is temperature-compensated to ensure accuracy over the operating range of the meter.
The meter can also be configured to synchronise the RTC against an externally-sourced control I/O signal, either
every hour or once a day.
The RTC meets the requirements for IEC 62052-21 and IEC 62054-21 time-switches for metering.
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