User's Manual

ANSI Electric Meter v3.1 User’s Guide 49
Magnetic Tamper
The meter is equipped with a sensor that detects large external magnetic fields. If
an external magnetic field is detected, the meter will automatically set an alarm.
The alarm is read and reset through NES System Software, or via the local optical
communications port. Typically, the magnetic tamper sensor is used to detect
potential fraud when strong magnets (such as rare earth magnets) are placed in close
proximity to the meter.
Tilt Conditions
The meter includes a sensor that will detect when the meter has been tilted,
indicating that it may have been moved or tampered with. This meter display
includes an icon that will appear when the sensor has detected a tilt condition. The
meter event log also now includes an alarm indicating when a tilt condition has been
detected.
Load Disconnect
The load disconnect contactor in the meter provides a manual means of load
disconnect, automatic prepay control, automatic trip at programmed power levels,
and remote disconnect operation. The load disconnect contactor can be electronically
turned off as a result of several configurable conditions. It can be turned on
manually using the disconnect switch push buttons. It can also be turned on remotely
with NES System Software, or directly via the optical port using the Provisioning
Tool. Note that the ability to turn on the load disconnect contactor remotely can be
disabled, as described later in this section.
Display Indicator for Disconnect Position and Load
Side Voltage
This display indicator, can be configured by the user to either reflect the
current state of the load disconnect contactor, or to indicate whether load side voltage
has been detected by the meter.
If it is configured to reflect the current state of the load disconnect contactor, it will
be illuminated when the load disconnect contactor is in the open position.
If it configured to indicate whether or not load side voltage has been detected by the
meter, it will be illuminated when there is no load side voltage detected by the meter.
When the load side voltage changes state, it can take up to one second for this icon to
reflect the change. You should take care to notice when this icon is not illuminated
and load side voltage is present for safety reasons, as the meter does not
automatically close the load disconnect contactor when there is load side voltage
present.
Note: If this display indicator is configured to reflect the current position of the load
disconnect contactor, the F4 icon will be used to indicate whether or not load
side voltage has been detected. In this case, the F4 icon will be illuminated
when there is no load side voltage detected.
There are two conditions that must be true for this display indicator (or the F4 icon)
to illuminate when load side voltage has been detected. First, the load disconnect
contactor must be open. Second, there must not be any load side generation (such as