Iota IQ4-X Manual

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 dic-
tate the voltage and force the charger into constant-current operation. As the battery charges, the
charger transitions to a constant-voltage operation. This BULK STAGE will continue for either 225
minutes or until the battery voltage reaches the “High Trigger” value (whichever occurs first). At this
point, the BULK STAGE will operate for another 15 minutes before switching to the ABSORPTION
STAGE.
ABSORPTION STAGE - This state is limited to 240 minutes (4 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 240 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 seven days when the IQ4-X initiates an equalization stage to remove sulfate layers from
the battery plates. In either situation, the unit exits the FLOAT STAGE and enters the BULK STAGE.
FAULT STATE - If the IQ4-X is exposed to an “over voltage” condition by exceeding the “Over
Voltage Trigger,” its circuitry is automatically disabled. In this state, the functionality of the IQ4-X is
completely disabled, the LED will flash irregularly, and the charger reverts 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.
PREDETERMINED VARIABLES FOR OPERATION
Battery
Voltage
12V
24V
BULK
14.8V
29.6V
ABSORPTION
14.2V
28.4V
FLOAT
13.6V
27.2V
LOW
TRIGGER
12.8V
25.6V
HIGH
TRIGGER
14.6V
29.2V
OVER VOLTAGE
FAULT
15.2V
30.4V
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 IQ4-X continues to monitor the battery volt-
age. If the battery voltage drops below a pre-determined voltage (Refer to Figure D for predeter-
mined values), the IQ4-X will automatically initiate multi-stage charging (BULK, ABSORPTION, and
FLOAT) once the AC input is re-connected.
IRREGULAR FLASHING LED - If the LED is flashing irregularly or intermittently, then the IQ4-X
has entered a FAULT state due to an over-voltage. When this occurs, the IQ4-X must be re-set in
order to resume normal operation. Refer to the FAULT STATE instructions on page for re-setting
procedures.
OPERATION AND LED INDICATOR REFERENCE (cont.)
CHARGING STAGE DESCRIPTIONS
Figure D: Predetermined Stage Trigger Values
68399-761 REV 1700