User's Manual

ANSI Electric Meter v3.1 User’s Guide 51
Locking the Disconnect in the Open State
You can configure the meter to lock the load disconnect contactor in the open state at
a specific time for a set period of time. This procedure can also be used to cancel
whatever schedule currently exists regarding the status of the load disconnect
contactor. The load disconnect contactor will be locked open at the scheduled
date/time until the configured duration has passed. If the duration is set to 0, the
load disconnect contactor will remain open indefinitely until another a new command
is issued that overrides the previous one.
If the meter is powered down at the preset date/time and the duration has not passed
when it is powered back on, the meter will be locked open until the specified duration
has elapsed (starting form the time the load disconnect contactor was locked open,
and not when the meter was powered back on). The scheduled date/time and
duration will be set to 0 if the duration expires while the meter is powered down,
meaning that the load disconnect contactor will no longer be locked in the open state
when power returns.
Prepaid Metering
The meter will automatically turn off the load disconnect contactor once the credit
level in energy (not currency) has gone to zero in a prepaid metering installation. The
meter reduces the amount of remaining credit based on energy usage and tariff level.
This feature can be enabled or disabled.
The consumer must manually reset the load disconnect once a credit level is re-
established in the meter. The meter will not allow re-engagement of the disconnect
until credit is loaded into it remotely from NES System Software, or directly via the
Provisioning Tool.
The meter can be configured so that a reverse energy flow deducts prepay credit just
as if it was forward energy, or the meter can be configured so reverse energy does not
deduct prepay credit.
Switching to Maximum Power when Prepay is
Exhausted
The meter can either be configured to turn off the load disconnect or to switch into
Maximum Power mode (to avoid complete power shutoff at the premises) once the
prepaid credit is exhausted (has reached zero). When switching to Maximum Power
mode, the Power Threshold on Exhausted Credit value (in watts) and the Maximum
Power Duration Threshold settings are in effect (see descriptions below). Normal
operation resumes when the prepay credit value is increased to above zero.
Emergency Prepay Credit
The meter can be configured to provide emergency credit after exhaustion of the
standard prepay credit. The maximum emergency credit amount is configurable. If
the emergency credit option is activated, it is automatically used upon exhaustion of
standard prepay credit. Once emergency credit is exhausted, the load disconnect
switch is turned off. It can only be turned back on when prepay credit level is
reestablished.
The emergency credit can be replenished separately from the standard prepay credit,
or they can be replenished together, with the emergency credit filling up to its
maximum value and the balance going into the standard prepay credit.