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Operational Functions
3
Operational Functions
3.1
Measurement
3.2
Anti-creep
3.3
Meter Memory
3.4
Reverse / Export Energy registration
5235 Single Phase Credit Meter – User Manual & Technical Specification
Issue: 4 5
The standard operational functions of the 5235
The Meter is a 120V or 220-240Vac, 50Hz or 60Hz, 5 to 100A Single
Phase Credit Meter. It contains a measuring element capable of measuring
active energy (kWh). The meter measures and registers kWh up to class
1.0. accuracy. The metrology LED is incorporated into the optical port and
pulses at a rate of 1,000 impulses per kWh for energy registration. All
variants offer a test mode, which shows 3 decimal places and is reset when
voltage is removed.
Below starting current, the meter enters into an anti-creep mode. In this
state the metrology LED is permanently lit and the registers do not
increment. The LED remains lit until the meter current is increased in a
forward direction beyond the starting current. The starting current is shown
in the technical summary.
All the meters data is to be recorded in a Ferroelectric Random Access
Memory (FRAM) under the control of the microprocessor. All the kWh
registers are stored in the FRAM and will be updated periodically and on
power-fail. The FRAM is able to be re-written throughout the life of the
meter and will hold the information, if required for over twenty years.
Three factory configurable reverse energy modes can be set as follows:
Export Energy Registration
A reverse / export energy register stores the value of kWh recorded by the
meter in a reverse direction. The register may be configured as part of the
display cycle of the meter. Alternately the register is held in memory and
can be read from the meter via the IEC 1107 port. The Reverse energy
register can be displayed with 0, 1 or 2 decimal places. Export energy will
be recorded in the same way as forward (Import) flowing energy using
identical starting currents etc.
A
F
B
E
C
D
Total Reverse
Reverse Energy Detection
A configurable option within the meter will alternate a warning message on
the display should a fraud attempt be made by running current backwards
Page 9 of 21
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