Load Shed - Kohler KD700 Operation

2.6

Load Shed

The manual key switch/ load shed module is available as an optional kit.
The load shed function drives outputs to four Form C dry contacts to remove non-critical loads. If the generator set load reaches
or exceeds the level set in power threshold #9, loads are shed until the total load drops below the threshold level.
Loads are added again when the total load drops below the level in threshold #9. Factory -set time delays ensure that the load
is stable before loads are shed or added. Load 1 is shed first and added last. Load 4 is shed last and added first.
The load shed level is set in Power Threshold 9 on the APM802 controller. The factory default setting for threshold 9 is 90%.
The threshold setting can be changed in Screen 1.2 after logging in with the operator's password. See the Operator Login and
the Menu 1- Settings sections.
Do not connect critical loads to the load shed outputs. Only connect low-priority loads that can be disconnected when necessary.
Connection
Controllers with load shed capability are equipped with a Manual Key Switch/Load Shed digital I/O Module, which is factory-
installed in the first position. Connect up to four non-critical loads to Load Shed Outputs 1 through 4 on the Manual Key
Switch/Load Shed Module. See Figure 14. The load shed outputs are Form C contacts. Connect to the normally open (NO) or
normally closed (NC) contacts as required for the application.
Power
Load (Disconnect) Time
Threshold *
1 #9
2 #9
3 #9
4 #9
 Default setting = 90%. Power threshold setting can be changed by the technician.
Figure 13 Load Shed Settings
Operation
The outputs are activated and loads are shed when the total generator set load reaches the level set in power threshold #9.
Load 1 (output #0) is shed first. Additional outputs are activated every 5 seconds as shown in Figure 13 until the total load drops
to the threshold value or all four non-critical loads are shed. Messages on the main screen will indicate that load shed outputs 1
through 4 are active.
If all four loads are shed, the generator set will continue to run if the load remains at or below 100% of the rated load.
When the generator set load drops below the level in threshold 9, the outputs are deactivated one at a time starting with Load 4
(output #3), reconnecting the loads. Adjust the loads, if necessary to avoid cyclic adding and shedding around the threshold #9
level.
TP-7070 11/22
Load Shed Load Add
(Reconnect)
Delay Time Delay
5 seconds 60 seconds
5 seconds 45 seconds
5 seconds 30 seconds
5 seconds 15 seconds
Displayed as
O #0
O #1
O #2
O #3
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