Landis+Gyr E650 Series User Manual page 13

Device description
Tariff control
Data preparation for
billing
Memory
Power supply
Auxiliary power
supply
Extension board
D000030108 en m – E650 Series 3 – ZMD300AT/CT – User Manual

Active and reactive power

Direction of rotating field

Total harmonic distortions of active energy, voltage and current
Rate control is performed:

Externally via control inputs (3 fixed, plus up to 4 others on the
extension board)

Externally via communication interfaces using formatted commands

Internally by time switch and calendar clock

By event signals based on threshold values of the monitoring functions
The following registers are available for evaluation of the individual
measured values:

32 for energy rates

27 for total energy

10 for running mean demand values

24 for demand rates

2 for power factors cosφ (combi-meters ZMD300CT only)

Up to 41 diagnostic registers

Others for values of voltage and current, network frequency and phase
angles
A non-volatile flash memory serves to record data profiles and also
contains the configuration and parameterisation data of the meter and
secures the billing data against loss due to voltage failures.
The supply voltages for the meter electronics are obtained from the three-
phase network, whereby the phase voltage can vary over the entire voltage
range without the supply voltage having to be adjusted. A voltage monitor
ensures correct operation and reliable data recovery in the event of a
power failure and correct restarting when the voltage is restored.
For medium or high-voltage applications in particular, the measuring
voltage can be switched off. Since the meter normally obtains its supply
from the measuring voltage, it is also switched off and cannot be read. The
auxiliary power supply connected in parallel with the normal power supply
ensures operation of the meter free from interruption, so that it can be read
at any time. The auxiliary power supply is situated on an extension board.
The extension board is fitted inside the meter and is secured by the
certification seals. It cannot be exchanged. It can have the following
components:

Up to 4 control inputs in combination with

Up to 6 output contacts (solid-state relays)

Up to 2 relays outputs

An auxiliary power supply
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