Kussmaul Electronics 091-75-AT - Manual (Page 4)

SEQUENCE CONTROL
The installer wiring the relays to the Load Manager Mark IV-AT controls load sequencing. In order to
limit the sequencing to fewer than 9 channels, a 4 element "dip switch" has been provided. This switch
locks out the sequencing function for channels 6, 7, 8, and 9. Placing the #1 switch in the "ON" position
enables channel 6 instantly, not in sequence. Placing the #2 switch in the "ON" position enables
channel 7, and so forth. This sequencing lockout control has no effect on the load shedding operation.
Any or all of the channels that are removed from the sequencer are still controlled by their load shedding
program switches.
INPUT SIGNAL POLARITY SELECTION
The Load Manager Mark IV-AT has been designed to accept command inputs of either +12 volts or
ground for the Load Manager Enable (pin 15) and the Start Sequencer (pin 12). Switch S10 on
the circuit board controls the polarity of both inputs. Placing this switch in the Source position permits
the Load Manager to respond to +12 volt inputs as illustrated in figure 1. With S10 in the Ground
position it is necessary to ground pins 12 and 15 for sequencing and load managing. The schematic
for ground inputs is illustrated in figure 3.
HIGH IDLE LOCKOUT
Since the High Idle output occurs first, before shedding any loads, the vehicle's engine will be speeded
up before any loads are shed. At some time, such as when a pump drive is to be engaged, it is
mandatory that the engine be at idle speed. (Pin 17) provides a means of disabling the high idle.
Switching (Pin 17) to ground will ensure that the High Idle is locked out. This has no effect on the
sequencing or load management functions of the Load Manager Mark IV-AT.