Equalize Timers - HindlePower SCR series Operating Instructions Manual

7. EQUALIZE TIMERS

Purpose: Equalize Timers are used to switch the charger into the equalize charging mode when
required by the batteries. Float and equalize indicating lights can be included on all timers to indicate the
charging mode. There are three basic timers which are described below.
Description:
a. PERCENT EQUALIZE TIMER WITH INDICATING LIGHTS (EJ0084-XX)
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 electromechanical 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 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 are provided as standard. The timer is used to drive a DPDT relay
(K6). One set of the relay's contacts control the float/equalize charging while the other set of contacts
control the indicating lights.
b. LINE FAILURE AUTO EQUALIZE TIMER WITH INDICATING LIGHTS (EJ0131-XX)
The principle of operation of this equalize timer with SW1 in the AUTO/EQUALIZE position is as
follows: When the AC power is interrupted for a period longer than 10 seconds, the battery charger is
placed in the EQUALIZE charge mode for a preselected period of time (0 to 72 hours). When the AC
power returns, the timer motor starts and completes the EQUALIZE charge period and then returns the
charger to the FLOAT mode. The timer resets itself 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).
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 clutch and
motor of TM1 operate. As long as TM2 is latched closed the charger is in the EQUALIZE mode. When
the timer motor times out, it opens the latch circuit of TM2 and returns the charger to FLOAT mode. The
timer clutch disengages and the timer (TM1) returns to its start position. Placing switch SW1 in the
EQUALIZE position overrides the timer function and the charger remains in the EQUALIZE mode. Float
and Equalize indicating lights are provided as standard.
c. MANUAL EQUALIZE TIMER (EJ0097-XX) WITH IND (EJ0096-XX)
To operate this 72 hour timer, turn timer control knob 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 (the timer control knob on zero), the clock motor is stopped and the
voltage sensing network is returned automatically to the float voltage value. This timer replaces switch
SW1. Float and Equalize indicating lights, as shown on EJ0096, are optional. The manual equalize timer is
available with a manual override switch as option EJ0869.
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