SGM3000 Series Smart Meters
User Manual
Restricted
GEH-7111-1.00-2
53
If all enable conditions are met, the LCD segment will remain ON when the load control relay is
in the connected state, will remain OFF when the load control relay is in the disconnected state,
and will flash with a 50 % duty cycle during the boost operation.
Note
: Although implied, when the LCD is blinking, the relay is physically in the open state until
the boost is activated.
Restriction to Protect Critical Customers
The SGM3000 Series meters with auxiliary load control relays will maintain a load control
functionality enable/disable flag. The load control enable/disable flag will be configured
independently for meters that have both a 32 A and a 2 A load control relay (SGM3013,
SGM3023, and SGM3033). The factory default setting for the load control enable/disable flag
will be the enabled state.
If the load control flag command is disabled, the relay remains in its current state regardless of
any other load control command that may be configured or received.
If the load control flag command is enabled, the relay will behave in accordance with the load
control functionality defined throughout this section of the functional specification.
The load control enable/disable flag can be configured at any time regardless of the current
operating mode of the meter.
Auxiliary Load Control Event Priority
The SGM3000 Series meters with auxiliary load control relays have a hierarchical approach to
the implementation of the load control functionality. The load control functionality will only
impact relays that have their load control enable/disable flag in the enabled state. The load
control functionality will (typically) cause a change to the state of the load control relay.
The hierarchy will be used to define the relay state behavior when more than one load control
activity occurs at the same time, with the higher priority event taking precedence.
The priorities are ranked as follows:
•
Priority 1
A change in relay state caused by a manual override, either initiated locally or remotely
Note:
If boost primacy is enabled, then the boost will become the highest priority and
manual override will be relegated to the second highest priority.
•
Priority 2
A change in relay state caused by an emergency load shedding state triggered by a
broadcast command to control groups
•
Priority 3
An open relay state triggered by an Under Frequency Load Shedding (UFLS) condition
•
Priority 4
