Landis+Gyr ZMQ202, User Manual

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Gyr H 71 0200 0215 f en - ZMQ202 / ZFQ202 - User Manual
26/88 Description of Unit
2.8.2 Event Log
Events that occur sporadically are stored in the event log. The user may
select what events trigger an entry in the event log. The event log is used
to analyse the behaviour of the network as well as to supervise the correct
application of the meter.
In the event log, a minimum of 256 event entries can be stored, all of
which consist of the time stamp of 5 bytes, the event number (1 byte) and
an internal offset of 1 byte.
The event log is organised as a circular buffer, i.e. the oldest entry will be
overwritten by the most recent entry.
2.9 Power Supply
The supply voltages for the meter are obtained from the three-phase
network, whereby the phase voltage may vary over the entire voltage
range without the power supply having to be adjusted. As the power
supply even works with only one phase voltage available, single-phase
voltage dips do not affect the operation of the meter.
A voltage monitor ensures correct operation and reliable data recovery in
the event of a all-phase voltage interruption and correct restarting when
the voltage is restored
2.10 Additional Power Supply
Because the three-phase network can be switched off in grid metering
applications, the meter is equipped with an auxiliary power supply in order
to prevent the meter from being switched off.
The additional power supply supplies its voltage in parallel to the normal
network supply and it ensures an uninterrupted operation of the meter, so
that the meter can be read at any time. In a special mode, the meter may
also be powered by the auxiliary power supply only (optional, depending on
parameter settings). As a result, there is no load on the line between
transformer and meter which prevents the line from voltage drops.
2.11 Transmitting Contacts Module
The transmitting contacts module is fitted inside the meter and is therefore
secured by calibration seals. It features up to four changeover contacts or
up to eight normally open contacts (solid-state relays). The contacts are
used to transmit energy pulses and/or energy direction information or
status information.
The transmitting contacts either transmit pulses with a defined pulse length
(20 ms, 40 ms or 80 ms) or pulses with a mark-to-space-ratio of 1.
There are transmitting contact modules with a pre-defined terminal
allocation while the terminal allocation of other modules can be
parameterised according to the customer’s specification.
Event log memory
size