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Note:
The generator management start % should be significantly lower than the Gen Overload Percent so that additional generators
will come online before a load is shed.
An under frequency event will also shed load—the under frequency threshold is not adjustable from the User Interface.
The load control will shed subsequent loads more quickly if shedding a load did not remove the overload or underfrequency
condition.
In a standard application (single generator or generator controlled by external switchgear) the load control logic uses the Gen
% or Rated kW and the Gen Frequency.
In a paralleling application (where the Decision-Maker
®
3500 controller is responsible for first-on, synchronizing, load sharing,
and generator management) the load control logic uses the Bus % of Rated kW and Bus Frequency. All generators use the
same start signal, load and frequency values to determine load control timing, hence each controller will shed and add a given
load priority at the same time (provided that the load control settings are identical in each controller).
In a paralleling application where Generator Management is used, some generator sets may be shut down (turned Off) by
Generator Management. Even if the generator set is Off, it may de-activate its Load Control outputs to energize those loads.
This may seem counter-intuitive, but the generator sets are acting as a system. If voltage and frequency of the paralleling bus
are adequate, and Load Add accumulators are met, the loads will be enabled, even if a particular generator set is shut down by
the Generator Management.
Description of User Adjustable Load Control Settings
The Load Control settings are found under GENERATOR INFO -> PARALLEL OPERATION -> LOAD CONTROL. Load control
is active, even if the generator is not operating in a paralleling application.
Gen % Max Cap. The load level on the generator (or paralleling bus, in a paralleling application) that the load control will not
intentionally exceed. If the load is within 15% of this load level, the load control will not add the next priority until the load
decreases (or another generator starts, synchronizes and closes its paralleling breaker/contactor, in a paralleling application).
Gen Overload Percent. The load level on the generator (or paralleling bus, in a paralleling application) above which the load
Control will start to consider shedding loads. Loads will shed more quickly if the generator is heavily overloaded, more slowly if
the generator is barely overloaded. If the load drops below the Gen Overload Percent before a load priority is shed, the
accumulator for shedding load is reset.
Note:
Additional load control settings are provided in SiteTech™, but they are configured during commissioning and should not require
adjustment after commissioning is complete. Have setup and adjustments of the Decision-Maker
®
3500 controller performed
only by an authorized Kohler distributor/dealer.
2.12 Controller Configuration Menu
2.12.1 Controller Configuration Submenu
• Language displays the user selected language. At this time, English is the only available option.
• Units displays the user selected unit of measure as Metric or English.
• Time Format displays the user selected time format as 12 hours or 24 hours.
• Date Format displays the user selected date format as mm/dd/yyyy or dd/mm/yyyy.
• Contrast displays user selected resolution values to improve digital display clarity.
• Alarm Silence displays the programmer selected alarm silence method Always or Auto Only using SiteTech™ software.
The Always selection activates the alarm horn in any of the OFF/RESET-AUTO-RUN modes. The Auto Only selection
activates the alarm horn only when in the Auto mode.
Note:
Press the Alarm Silence/Lamp Test button to silence the alarm horn.
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