BULK / FINISH STAGE
- During this state, the charger will operate either at Full Current output or
Constant Voltage output depending on the discharged state of the battery. A discharged battery will
dictate the voltage and force the charger into constant-current operation. As the battery charges,
the charger transitions to a constant-voltage operation. This BULK / FINISH STAGE will continue for
up to 480 minutes. At this point, the IQ-AGM will switch to the FLOAT STAGE.
FLOAT STAGE
- This charge state holds the batteries at Constant Voltage for a period not longer
than seven days. During this state, the charger not only floats the batteries, but it can also provide
load current up to its maximum rating for other loads without depleting the battery capacity. The
FLOAT STAGE will end when either the battery voltage drops below the “Low Trigger” point or at the
end of 7 days when the IQ-AGM initiates the MAINTENANCE stage to ensure a complete charged
condition. In either situation, the unit exits the FLOAT STAGE and enters the BULK/FINISH STAGE.
FAULT STATE
- If the IQ enters a FAULT state, its circuitry is automatically disabled. In this state,
the functionality of the IQ is completely disabled, the LED will flash irregularly, and the charger re-
verts to a stand-alone FLOAT STATE voltage. The unit will not exit this stand-alone FLOAT STATE,
therefore the unit must be reset by following the steps below.
1. Unplug the charger from its AC source.
2. Disconnect the [+] positive cable from the battery.
3. Wait 30 seconds before reconnecting the input and output. To avoid arcing, it is recom-
mended that the charger be connected to the AC input FIRST before connecting the output
of the charger to the battery*.
*Note that the connection sequence of the input and output covered above is recommended every
time an operator connects the charger to the batteries. However, as long as the charger remains
connected to the battery, periodic unplugging of the AC input does not require this sequence.
The LED indicator will remain lit or flashing when the charger is unplugged or disconnected from
the AC supply (de-energized). During this time, the IQ continues to monitor the battery voltage. If
the battery voltage drops below a pre-determined voltage (Refer to
Figure D
for predetermined val-
ues), the IQ will automatically initiate the smart-charging cycle once the AC input is re-connected.
IRREGULAR FLASHING LED
- If the LED is flashing irregularly or intermittently, then the IQ has
entered a FAULT state due to a voltage irregularity. When this occurs, the IQ must be re-set in order
to resume normal operation. Refer to the FAULT STATE instructions below for re-setting procedures.
OPERATION AND LED INDICATOR REFERENCE (cont.)
CHARGING STAGE DESCRIPTIONS
Figure D: Predetermined Stage Trigger Values
68412-113 REV 1800
PREDETERMINED VARIABLES FOR OPERATION
Battery
Voltage
12V
24V
BULK / FINISH
14.7V
29.4V
FLOAT
13.6V
27.2V
LOW
TRIGGER
12.8V
25.6V
