This part of the IEC 62055-31 standard applies to newly manufactured, static watt-hour pay meters with accuracy classes 45 and 65 for direct connection, for the measurement of alternating current electrical energy consumption of a frequency in the range of 1 Hz to 2 Hz.
This only applies to checkout counters for indoor applications where the checkout counter must be installed for normal service (ie with a specific matching outlet where appropriate).
Payment meters are used in cases where the electrical energy supply to the load may be interrupted or restored under the control of the payment meter regarding a payment tariff agreed between the customer and the supplier. A checkout counter is part of a system that uses token bearers to transmit payment information as tokens between a sales network and checkout counters, which includes the meter calculation process.
The functions of a payment meter are to measure the electrical energy consumed and reduce the current credit value according to the measured consumption and possibly elapsed time. This available credit value is increased as a result of payments made to the electricity supplier, and the meter accounting process continuously calculates the available credit balance on the customer's hand. When the available credit value is reduced to a predetermined value related to the payment mode in use, a switch is used to cut off the supply to the customer's load.
Electricity to the load in accordance with the current value of the current loan held in the payment counter
switch to interrupt or restore its supply.
It does not apply to static watt-hour pay meters where the voltage between connection terminals exceeds 600 V (line-to-line voltage for meters for multiphase systems). Applicable to indoor applications checkout counters only.
This part of IEC 62055 does not cover specific functionality or performance requirements for safety, circuit protection, isolation or similar purposes that may be specified by reference to other specifications or standards.
This part of IEC 62055 does not cover software requirements. Software requirements for basic energy meter metrology are being evaluated for the IEC 62059 series of standards and other organizations.
This part of IEC 62055 only covers type testing requirements. For acceptance testing, the concepts given in IEC 61358 can be used as a basic guide. Reliability issues are addressed in the IEC 62059 series of standards.
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