Float Adjustment; Equalize Adjustment; Current Limit Response And Adjustment; Checks And Adjustments - HindlePower SCR series Operating Instructions Manual

a. Float Adjustment
1. Since the charger must be operable for this adjustment, preceding checks in Section IV, 1 above
must indicate a serviceable charger. Set SW1 to "FLOAT". Use a portable voltmeter of one percent
accuracy. Connect the battery supply leads to the battery and close DC (battery) circuit breaker, CB2. Set
AC circuit breaker CB1 to ON.
2. Since the EQUALIZE and FLOAT potentiometer control settings interact with each other, it is
always necessary to adjust the FLOAT control first and then the EQUALIZE control afterward. Never
finalize a voltage adjustment with the charger output in excess of 100% rated output current.
3. Turn the control clockwise, watching the response on the voltmeter. Clockwise rotation should
cause the charger output current to increase rapidly, while the voltage should rise slowly. The rate of
voltage rise depends upon whether the battery is fully charged, the size of any connected load, and the size
of the charger versus the size of the battery. After getting several volts response in battery voltage rise,
turn the FLOAT control counterclockwise. This should result in a rapid drop in charger output current and
eventually in a slow decrease in battery voltage. Now adjust the voltage for the desired float setting and
tighten the locknut on the potentiometer.
b. Equalize Adjustment
1. Since the equalize adjustment will not affect the float voltage adjustment and requires a higher
voltage it should always be made after the float voltage is determined. Use a portable voltmeter of one
percent accuracy as in the float adjustment. Set SW1 to "EQUALIZE". Close DC (battery) circuit breaker.
Set AC circuit breaker CB1 to ON.
2. In attempting to set the equalize voltage setting, one thing must be kept in mind. It will be
impossible to set the equalize voltage if the batteries are in a discharged condition. If fact, they must be at
near full-charge. This is to prevent the charger from going into a current limit condition. Current limit
reduces the charging voltage and no matter if the EQUALIZE potentiometer is increased to a full-
clockwise position, the charger voltage will not increase.
3. Therefore, it is suggested that the batteries be placed on equalize charge for several hours so that
the charger is no longer in current limit. This should be observed using the portable 1% accuracy voltmeter
and the charger panel ammeter. When the charging current falls below the 100% rated value of charger
current, observe the voltage and set carefully for the desired equalize voltage. If, upon readjustment, the
current again goes into current limit wait for the batteries to continue their charge cycle. Continue this
adjustment procedure until the desired voltage is reached and the current is less than rated current. When
the final setting is determined, tighten the lock nut on the EQUALIZE potentiometer.

2. CURRENT LIMIT RESPONSE AND ADJUSTMENT

a. Make certain the charger leads are connected to the battery and that the panel voltmeter indicates the
proper polarity. Switch the battery DC circuit breaker CB2 to ON and AC line circuit breaker CB1 to ON.
The indicating light, DS1, should illuminate, indicating power has been applied. With the charger in float
mode a float voltage charge should be indicated on the panel voltmeter and the ammeter should show
either a charge current, or practically none at all, depending on the state of battery charge.
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