Product Manual

4. Operation8-2019
61A062J680 (Issue 2) Copyright © 2019 Cummins Inc.
When the generator set is started automatically in Standby mode due to a loss of
utility or manually by the operator, the control will energize all four load
management outputs, disconnecting the associated loads from AC power. Once
the transfer switch transfers to generator set power, the generator set control will
evaluate the total load on the generator set versus a set point programmed into the
control (80% of rated).
If the generator set’s total load is below the set point, the generator set control will
sequentially add the highest priority managed load every three minutes. Managed
loads will continue to be added as long as the size of the next priority load to be
added won’t increase total generator set load above the set point. The control
measures and stores the size of each managed load in its memory. Load priorities
are in the following order:
• Priority #1: load control 1
• Priority #2: load control 2
• Priority #3: load control 3
• Priority #4: load control 4
If the load on the generator set is reduced at any time to below the set point, the
control will add the next highest priority managed load in three minutes provided it
does not increase the total generator set load above the set point.
If the load on the generator set exceeds 95% of its rating, the generator set control
will begin disconnecting the lowest managed priority loads in sequence every
second until the load on the generator set is below 95% of its rating.
Priority #1 load is always the first added and the last disconnected; therefore, it
should be wired to the managed load deemed most critical to the homeowner.
Priority #2 load cannot be added before priority #1 load, nor can it be disconnected
before priority #3 or #4, etc.