INTRODUCTION:
The 091-98-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 R5. 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 volt-
age applied to the input terminals with a precise voltmeter and noting the voltage at which the
red LED turns “ON”.
The 091-98-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 ener-
gized until the voltage increases above 13.45 volts. This assures that the loads being con-
trolled are not energized until the sensed voltage reaches 13.45 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.
