Zenner EDC Manual De Montaje Y Operacion página 14

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Leakage detection:
If over a period of 24 h (96 quarter hour values)
the flow value is never zero, than this indicates a
leak. The EDC module sets corresponding bits.
If the flow rate remains zero during one quarter of
an hour (before reaching 96 quarters of an hour
with no flow) the algorithm restarts.
If 96 quarters of an hour were running with flow,
leakage remains set until during 8 quarters of an
hour in a row the flow remains zero.
The event memory stores the date and time of
the event.
Meter Stop detection (blockade)
If no meter progress will be detected by the EDC
module over a period of 4 weeks, meter stop
(blockade) is detected. The blockade deemed to
be revoked if a meter reading difference of > 10
liters occurs in a quarter of an hour.
Meter oversized detection
Meter is oversized when the flow rate never
exceed 0,1*Q3 (10% of Q3).This is averaged
over a 15-minute period. It is counted how
many times the flow rate of 10% of Q3 is not
achieved. If the flow rate is not reached after 30
days "meter oversized" is detected.
If once a flow rate of> 10% from Q3, averaged, is
reached by a quarter of an hour, the detection is
permanently disabled and the status "meter over-
sized" deleted.
The event memory stores the date and time of the
event.
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Meter undersized detection
If the flow rate is continuously higher as Q3
(permanent flow) over a 6-hour period, this
indicates an undersizing of the meter and the
message "meter undersized" will be detected.
This is averaged over a 15-minute period.
The event memory stores the date and time of the
event.
Pipe burst detection
For EDC modules with M-Bus and Pulse: "Pipe
burst" is detected when the flow rate has exceed-
ed a given value (>30% of Q3) during a 30-minute
period. This is averaged over a 15-minute period.
The event memory stores the date and time of
the event.
Reverse water flow detection
(wrong assembly)
If after reinstalling, the EDC module detects that
the meter is running backwards each ¼ hour for
12 hours , reverse water flow is detected (wrong
assembly). If the meter runs forward for 4 hours,
the message shall be considered as finished.
Note:
The smart metering functions of the EDC retrofit
modules are factory disabled. To use these func-
tions, the respective settings have to be made
in dependence of the permanent flow (Q3) via
the optical interface of the EDC module. The pro-
gramming of the smart metering function settings
is made by using a ZENNER software, the uni-
versal interface MinoConnect and the ZENNER
infrared optohead IrCombiHead.
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