Kussmaul Electronics 091-9-1000 - Manual (Page 2)

Introduction
The AUTO CHARGE 1000 Pump Plus is a compact, completely automatic, single channel
battery charger designed for vehicles with a single battery system. The charger is rug-
gedized to withstand the shock and vibration encountered by vehicle mounted equipment.
The Auto Charge 1000 Pump Plus operates an 091-9 air compressor. With the selector
switch in the AC position the compressor runs only when the AC power is applied. With
the selector switch in the DC position the compressor will operate when the AC power is
on or off. In either position the compressor operates from the vehicle’s batteries, the Pump
Plus automatically recharging the batteries as required.
The battery charger features:
• Electronic remote sensing of true battery voltages, eliminates the need
for sensing wires
• Automatic current limiting
• Built-in BATTERY SAVER
• Remote battery charge/condition indicator
• Power “ON” LED indicator
• BATTERY SAVER overload indicator
Charge Controls & Electronic Remote Sensing
The Auto Charge 1000 Pump Plus contains a precision voltage controller to maintain
the battery’s charge. Automatic electronic remote sensing measures the true battery
voltage, eliminating the need for the additional sense wires. The output current of any
charger is inherently a series of pulses whose frequency is determined by the power
line frequency. Therefore their are brief intervals during which no charging current flows.
During this brief interval the Auto Charge 1000 Pump Plus measures and stores the bat-
tery voltage. This battery voltage is compared to a standard and any error is detected
and used to control the charger output at the desired level. Their is no “trickle charge”
and therefore no danger of overcharging and water boil-off.
Automatic Current Limiting
When batteries are severely discharged, some battery chargers can be overloaded due
to the high charging current required. The Auto Charge 1000 Pump Plus contains an
automatic current limit. This circuit limits the output current to the rated 15 amperes
when charging a deeply discharged battery or if the starter cranks the engine while
charging. The current limiter thus eliminates the need for an ignition interlock circuit.