INTRODUCTION
:
The 091-79-12 LOAD MANAGER 2 is a device which continuously monitors the voltage of the
battery. The unit is factory set to actuate at 12.0 volts, but may be field adjusted to other
voltages. Two output relays are provided. One relay is actuated at the 12.0 volt threshold
while the other relay operates when the voltage decreases to 11.50 volts. The output relays
are capable of switching 30 amperes and both “normally open” and “normally closed” contacts
are provided.
INSTALLATION
:
Connect the Load Manager 2 to the battery and the loads as illustrated in figure 1. This is a
typical circuit; many other variations are possible. It is important to connect the Bat+ and
Bat- terminals to that point at which the voltage is to be sensed.
ADJUSTMENT
:
The factory adjustment for the Load Manager 2 is 12.0 volts for the first relay to be energized.
The 2nd relay is energized at a voltage .5 volts lower than relay 1. No separate adjustment is
provided for relay 2.
To readjust the setpoint, remove the 4 screws and lift off the cover. Connect a variable volt-
age source to the battery input terminals and an ohmeter across the normally open contacts of
relay 1. Vary the input voltage to the point at which relay 1 just becomes energized. Turn the
trimmer resistor R100 slightly CCW to lower the setpoint or slightly CW to raise the setpoint.
Check the new setting to determine what voltage will cause the relay to be energized.
CAUTION
The circuit responds very slowly so allow ample time, 15 to 30
seconds for the circuit to respond to voltage changes. This time
delay is required to prevent the relay from chattering for small changes
in voltage around the setpoint.
SPECIFICATIONS:
Input Voltage: 10 to 15 volts, D.C.
Input Amps: .020 amps, relay deenergized
.20 amps, relay energized
Relay Contacts: 30 amperes, max.
Case: non weatherproof, polypropylene
Weight: 8 ounces
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