BULK 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 char-
ger transitions to a constant-voltage operation. This BULK STAGE will continue for 240 minutes. At
this point, the BULK STAGE will switch to the ABSORPTION STAGE.
ABSORPTION STAGE
- This state is limited to 120 minutes (2 hours) during which the charger
will operate either at Full Current output or Constant Voltage output depending on the discharged
state of the battery. During Full Current output, the charger is providing its full current rating and will
slowly increase the battery voltage to the “Absorption Stage” voltage. At the end of the 120 minutes,
the charger will revert 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-TURBO initiates the MAINTENANCE stage to ensure a complete
charged condition. In either situation, the unit exits the FLOAT STAGE and enters the BULK 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
68412-110 REV 1800
PREDETERMINED VARIABLES FOR OPERATION
Battery
Voltage
12V
24V
BULK
14.78V
29.56V
ABSORPTION
14.51V
29.02V
FLOAT
13.6V
27.2V
LOW
TRIGGER
12.8V
25.6V
HIGH
TRIGGER
14.6V
29.2V
OVER VOLTAGE
FAULT
15.2V
30.4V