Load Limiting; Supply Capacity Control; Reduced Emergency Credit Load; Change Of Supplier (Cos) - Secure Liberty 100 Technical Reference Manual

5.12

Load Limiting

Liberty 100 meters support the following two types of load limiting when operating in Prepayment mode:

1. Supply capacity control

2. Reduced Emergency Credit load

Load limiting for a SIP is skipped if there is a load limit configuration change, time setting, time synchronisation
or power interruption during the averaging period.
5.12.1 Supply Capacity Control
Supply Capacity Control restricts the user from drawing more power than the defined load limit. This is done
using the demand value, which is calculated from the energy consumed within the defined monitoring period
(configurable monitoring period is 30 to 3600 seconds).
The meter when operating in Credit or Prepayment mode will disconnect the supply if the demand is above the
defined load limit and will display an 'OVERLOAD' message for 20 seconds on the meter display after which the
meter puts the switch into 'READY' state and displays instructions for reconnecting supply. If configured, the
meter will send a supply disconnection alert to the IHD and HES as well as log the occurrence of overload as an
event and increment the load limit occurrence counter (the counter can be reset by sending an authenticated
command).
5.12.2 Reduced Emergency Credit Load
Reduced Emergency Credit load provides a longer Emergency Credit period by reducing allowed load when
Emergency Credit is in use.
5.13

Change of Supplier (COS)

On receipt of a COS request any delayed COS request will be cancelled and the meter will perform one or more
of the following actions, depending on the configuration:
● Performs a billing action before and after change of supplier.
● Takes a billing snapshot before and after change of supplier; if the meter is operating in Credit mode
then the meter balance is also reset.
● Resets Credit and Debt registers (in Prepayment mode the Credit register will automatically start using
the Emergency Credit allowance, if available).
● Resets tariff to its Default mode value.
● Clears snapshot registers, historical load profile information, payment card ID, UTRN log, prepayment
log, account log, hardware log, configuration log, supply quality log, operating condition log, supply log
and tamper log.
● Changes the meter's switch state to 'Off' or 'READY' state.
After COS activation the meter logs an event, together with the date and time of COS activation, and then
performs the following actions:
• Cancels all delayed tariffs having the old supplier ID.
• Updates the current active tariff with the new supplier ID and supplier name.
• Makes all consumption history, payment history and profile data available for the IHD and meter display.
• Communicates all meter data over WAN.
Page 42 of 116 Liberty 100 Smart Electricity Meter Technical Reference Manual BGX501-767-R02