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34 Freedom Sequence Intelligent Power Manager Owner’s Guide
Freedom Sequence Operational Concepts
AC Load Shedding
When the current draw from the main AC source increases beyond the
current clamp, Freedom Sequence power manager starts to shed (to
disconnect) AC load circuits in a priority order set by the installer. Circuits
having the lowest ranking priority gets shed first.
Freedom Sequence takes into account the Line Association of a circuit
for load shedding when it operates with a split phase AC source. It will shed
the circuit with lowest ranking priority with the group of circuits associated
to the line that is overloaded.
When it operates from a single phase supply, Freedom Sequence does not
check for line association before shedding the lowest ranking priority load
circuit.
After an overload condition is detected, Freedom Sequence waits for two
seconds to check if the overload persists before disconnecting a load circuit.
If the overload condition is corrected it will not disconnect any load circuit,
otherwise, it will shed the lower ranking priority circuit.
If disconnecting of one load circuit was not enough to correct the overload
condition, the power manager will continue to shed the next lowest priority
ranking load that is On until the overload condition is corrected.
The Freedom Sequence power manager keeps in its onboard memory the
current each load circuit was drawing before it got disconnected. This
current is displayed on the SCP as the Last Shed Current. The power
manager uses the two values, Reconnect MRGN and Last Shed Current
to determine if adequate headroom of current is available to reconnect the
load circuit. If the headroom of current was available throughout the
Connect Seq Delay period the power manager would reconnect the
circuit. However, if during this Connect Seq Delay period the available
headroom falls below the Reconnect MRGN plus Last Shed Current
then, the power manager will not reconnect the circuit.
The Freedom Sequence power manager will reconnect circuits in the order
of highest ranking load circuit in the Off setting. When operating on a split-
phase AC, the power manager will reconnect specifically those load circuits
which are associated to the line that has adequate headroom.
While operation on a single-phase AC, the power manager will not check
for line associations.
See the illustration on the next page.
FSequence IPM Owners Guide.book Page 34 Thursday, October 6, 2011 3:33 PM