Exide Technologies JA5009-00 - Manual (Page 21)

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7. EQUALIZE TIMERS
Purpose: Equalize Timers are used to switch the charger into equalize charging mode for a set period of
time, when required by the batteries. "FLOAT" and "EQUALIZE" indicating lights mounted on the
instrument panel can be included with all timers to indicate the charging mode. There are three basic timers
described below. These Equalize Timers replace the standard "FLOAT/EQUALIZE" switch (SW1) featured
in the charger mainframe and referenced elsewhere in this manual.
Descriptions:
a. MANUAL EQUALIZE TIMER (EJ0097), W/LIGHTS (EJ0096), W/LIGHTS & SW (EJ0869)
To operate this 0-72 hour timer, turn the timer control knob (TM1) clockwise to the number of charge
hours desired. This will start an AC clock, driving two cams, which operate two contacts. One contact
provides AC to the clock motor, the other changes the voltage-sensing network to the higher equalizing
voltage. Upon completion of the time period, when the timer control knob reaches "0", the clock motor is
stopped and the voltage-sensing network is returned automatically to the float voltage value. Option EJ0096
features the aforementioned manual equalize timer, along with "FLOAT" and "EQUALIZE" indicating
lights. Option EJ0896 features the aforementioned manual equalize timer and indicator lights, along with a
manual "FLOAT/EQUALIZE" switch.
b. AC LINE FAILURE AUTO-EQUALIZE TIMER WITH INDICATOR LIGHTS (EJ0131)
The Auto-Equalize timer is designed to automatically provide an equalizing cycle when the ac input has
been interrupted longer then 10 seconds. The operation of this equalize timer is as follows. Toggle switch
(SW1) to the "AUTO/EQUALIZE" position, and the battery charger in the "FLOAT" mode: When the AC
power is interrupted for a period longer than 10 seconds and returns, the battery charger is placed in the
"EQUALIZE" charge mode for a pre-selected period of time (0 to 999 hours). The timer, now energized,
displays time remaining and completes the equalize charge period. Once the timer reaches "0" the charger
will switch to the "FLOAT" mode. The timer will shut its self down and remains ready to repeat the
operation for the same number of preset hours. The charger may also be returned to the "FLOAT" mode by
pushing the "FLOAT RESET" switch (SW11).
The schematic diagram (EJ0131) shows the circuit details. Relay (TM2) is a 10-second time-delay relay,
which latches itself closed 10 seconds after the AC power fails. When the AC power returns, the timer
(TM1) operates. As long as TM2 is latched closed, the charger is in "EQUALIZE" mode. When TM1 times
out, it opens the latch circuit of TM2 and returns the charger to "FLOAT" mode. The timer clutch then
disengages, and the timer (TM1) returns to start position. Placing switch (SW1) in the "EQUALIZE"
position overrides the timer function and manually puts the charger into "EQUALIZE" mode. "FLOAT" and
"EQUALIZE" indicating lights mounted on the instrument panel are standard, to indicate the charging mode.
c. PERCENT EQUALIZE TIMER WITH INDICATOR LIGHTS (EJ0084)
The “PERCENT” Equalizing Timer is used for certain types of batteries that required a period of
equalizing charge every 72 hours. The timer is an electro-mechanical timer whose dial reads from 0 to
100%, and whose drive motor rotates internal cams once every 72 hours.
If the operator sets the “percent” dial for 10%, for example, the timer will operate the cams such that the
EQUALIZE charge contacts will be closed for 7.2 hours (10%) out of the 72 hour continuously cycling
rotation period.
There is a manual "FLOAT/AUTO-EQUALIZE" switch (SW4), which interrupts the motor circuit when
the batteries are to be left in "FLOAT" charge.
"FLOAT" and "EQUALIZE" indicating lights mounted on the instrument panel are standard, to indicate
the charging mode. The timer is used to drive a DP-DT relay (K6). One set of the relay’s contacts control
the float/equalize charging while the other set of contacts control the indicating lights.