IOTA IQ4 - Manual (Page 2)

OPERATION OF THE IQ4 IN THE 3-STATE MODE
BULK STAGE - During this state, the charger will operate either at Full Current output or Constant Voltage output depend-
ing 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 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 480 minutes (8 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 480 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 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 Trig-
ger” point or at the end of seven days when the IQ4 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 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 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 recommended 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
36V
48V**
BULK
14.8V
29.6V
44.3V
59.2V
ABSORPTION
14.2V
28.4V
42.6V
56.8V
FLOAT
13.6V
27.2V
40.7V
54.4V
LOW
TRIGGER
12.8V
25.6V
38.4V
51.2V
HIGH
TRIGGER
14.6V
29.2V
43.8V
58.4V
OVER VOLTAGE
FAULT
15.2V
30.4V
45.6V
60.8V
FIGURE D. OPERATING VARIABLES
**48V applications require the IQ4-54V Model