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3.4
Selecting the Charging Mode
The A75D(E) has two different settings for DC output voltage, float mode and equalize mode. Float charging
mode is used for all normal battery charging needs, in the case of the A75DE the float mode can also be used
for battery elimination (directly powering the DC load from the A75DE). Equalize mode is used when it is
necessary to equalize (or balance) the level of charge across all cells present in the battery.
There is an LED which indicates the current mode of the charger to the bottom right of the charger. If the
charger is in Float mode simply press the
button to switch into Equalize mode. If the charger is in
Equalize mode it will automatically switch back to float mode after the designated equalize time, alternatively
the charger can manually be switched to float mode by pressing the
button.
3.4.1 Equalize Timer Modes
The A75D(E) battery charger has five different modes of Equalize charging operation. The Equalize mode can
be viewed on the charger display by pressing the
button twice (while viewing the DC outputs). The equalize
mode can be changed via Customer Calibration which will be discussed in detail in section 3.5 in all of the
equalize modes, the charger will return to float mode if the
button is pressed.
Mode 0 (Displayed As “P0”)
Mode 0 is a manual equalize cycle and is the default setting for the charger. When the charger is set for mode
0 the equalize cycle must be activated manually. Once activated the equalize timer will turn on and the
equalize "LED" will light. The length of the timer is eight hours by default and can be changed via Customer
Calibration. After the timer cycles to zero the charger will automatically return to the float mode. Equalize mode
will not start again until it is manually activated by the user.
Mode 1 (Displayed As “P1”)
Mode 1 is an automatic equalize cycle that activates every seven days. The length of the equalize cycle is
determined by the timer setting. The length of the timer is eight hours by default and can be changed via
Customer Calibration. After the timer cycles to zero the charger will automatically return to the float mode.
Equalize mode will restart again after seven days.
Mode 2 (Displayed As “P2”)
Mode 2 is an automatic equalize cycle that activates every 14 days. The length of the equalize cycle is
determined by the timer setting. The length of the timer is eight hours by default and can be changed via
Customer Calibration. After the timer cycles to zero the charger will automatically return to the float mode.
Equalize mode will restart again after 14 days.
Mode 3 (Displayed As “P3”)
Mode 3 is an automatic equalize cycle that activates every 30 days. The length of the equalize cycle is
determined by the timer setting. The length of the timer is eight hours by default and can be changed via
Customer Calibration. After the timer cycles to zero the charger will automatically return to the float mode.
Equalize mode will restart again after 30 days.
Mode 4 (Displayed As “P4”)
Mode P4 is an automatic equalize cycle that is triggered when the battery experiences a sizeable discharge.
When the DC voltage drops below the LV alarm threshold (default 1.98V/C for Lead Acid, 1.2V/C for NiCad), &
exceeding a minimum time delay (default 30 seconds). Momentary dips in DC voltage shorter than the
minimum delay will not trigger the P4 Auto-EQ timer. When the charger raises the battery voltage high enough
to clear the LV alarm (default
≥
5% above the LV alarm threshold), the EQ timer will start and will run the
charger in the EQ mode for the duration set in the EQ menu (default 8Hrs). When the EQ timer expires, the
charger will immediately return to the Float charging mode. The EQ timer mode, LV alarm voltage, time delay,
