Kussmaul Electronics 091-96-12 - Manual (Page 2)

INTRODUCTION:
The 091-96-xx LOAD MANAGER 1H is a device, which continuously monitors the voltage of the
battery. The unit is factory set to actuate at 12 volts, for 12 volt models or 24 volts for 24-volt models,
but may be adjusted to other voltages. The output relay is capable of switching 30 amperes, and both
a “normally open” and normally closed” contact are provided.
INSTALLATION:
Connect the Load Manager 1H to the battery, the load and the fuse as illustrated in figure 1. This is
a typical circuit. Other circuit configurations are possible. It is always necessary to connect the Bat+
and Bat- terminals to that point at which the voltage is to be sensed.
ADJUSTMENT:
The factory setting for the Load Manager 1H is 12.0 volts (24 v). Field adjustment of the set point is
possible. To do this, remove two screws holding down the cover. Note the position of the voltage
adjustment trimmer R6. This is the 12-volt (24 v) setting. To decrease the voltage turn counter
clockwise. To increase the voltage turn clockwise. Two indicator LED’s are provided adjacent to the
terminal strip. When the green LED is lit, the voltage sensed is normal. When the red LED is lit, the
voltage is below the set point. The voltage detector can be tested by gradually lowering the system
voltage while simultaneously measuring the voltage applied to the input terminals with a precise
voltmeter and noting the voltage at which the red LED turns “ON”.
The 091-96-xx Load Manager 1H contains an adjustable high hysteresis feature. With the normal trip
point set to 12.0 volts (24.00 volts), the hysteresis circuit maintains the relay energized until the voltage
increases above 13.45 volts. This assures that the loads being controlled are not energized until the
sensed voltage reaches 13.45 volts (26.9 volts). This limits the ON/OFF cycling of the load. The
hysteresis may be adjusted using trimmer R15. Turning R15 CCW will decrease the hysteresis while
turning CW will increase. Unless absolutely necessary it is recommended that the hysteresis remain
at the factory setting.