Iota IQ4-X Specification Sheet

IOTA Engineering 1361 E. Wieding Rd Tucson, AZ 85706 1-800-866-4682 www.iotaengineering.com
Rev. 060617
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The LED Indicator on the IQ4-X informs the user of the DLS-X charging
state and the battery charge status. When first activated, the IQ4-X will
read the number of cells in the battery and indicate the voltage of the
battery through a number of flashes. Refer to Figure A
LIT/FLASHING LED - After reading the battery, the IQ4-X will initiate in
Bulk Charge phase. When the IQ4-X is in the Bulk Charge mode, the
green LED indicator will flash rapidly (approx. 2 flashes per second).
When the Bulk Charge is complete, the IQ4-X begins the Absorption
Charge and the LED indicator will flash at a slower rate (approx. 1 flash
per second). If the battery is not in need of charging, the IQ4-X will begin
the Float Charge phase and the LED will remain lit (no flashing).
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 voltage. 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.
Figure A: LED Code Table
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 char-
ger 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 volt-
age 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.
STAGE DESCRIPTIONS
OPERATION
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
Figure B: Predetermined Stage Trigger Values