Tamper Detection - Landis+Gyr E470 User Manual

Page 14 of 69
4.3.2 Valid Button Press
4.3.3 Invalid Purchase Code
4.4

Tamper Detection

4.4.1 Reverse Energy Detection
4.4.2 SIM Card Removal Detection
© Landis+Gyr
Issue: 1.8
For low credit warning the buzzer shall sound for 30 seconds followed by 2
second beeps every 30 seconds for total of 5 minutes.
The low credit warning is stopped if the Display Cycle button is pressed.
The Low Credit Warning is a configurable item and may be disabled.
The buzzer sounds a short beep each time a valid Display Cycle button
press is made.
The valid button press beep is a configurable item and may be disabled.
If an Invalid Purchase Code is entered, the meter will give a 1 second beep
to signify the code is incorrect.
The meter includes several anti tamper features.
If the meter is configured to operate in a reverse energy fraud detection
mode the meter will alternate a warning message on the display should a
fraud attempt be made by running current backwards through the meter.
The reverse energy-warning message is triggered when the reverse power
exceeds a programmable threshold level of between 1-10 Amps for a
period of 10Wh. A reverse energy event can optionally be communicated to
the utility information system immediately or returned with scheduled read
meter status.
The meter will store the number of RED tamper events detected together
with the time and date of the last recorded event.
Once triggered the reverse energy-warning message can only be reset by a
command programmed either via the IEC 1107 port or by SMS message.
The meter is fitted with two detection devices to protect the SIM card fitted
to the meter. An initial detection device monitors the opening of the flap
covering the SIM aperture. A second detector monitors the movement of
the SIM carriage outwards from the meter. The sim carriage detection
circuit operates when on or off supply. On triggering of either detector, the
meter stores the number of SIM tamper events together with the time and
date of the last event. On the event of a tamper event the meter will enact
all, any one or none [configurable] of the following actions:
Meter Operation
E470 Tokenless Smart Prepayment Meter