Yale 524150797 Maintenance Manual page 372

®
AccuSense Q-Series Charger
Variations in this charge stage are highly de-
pendent on the battery Charge MODE selec-
ted. Flooded Lead Acid batteries are typically
aggressively charged to high voltage levels to
force internal gassing which helps to mix the
electrolyte. AGM (Absorbed Glass Mat) batter-
ies differ in that this stage limits upper voltage
regulation levels which helps prevent drying
out the Absorbed Glass Mat. Upon completion
of this stage, approximately 100% of total
charge is delivered to the battery.
5. EQUALIZATION Charge Stage:
The Equalization Charge Stage helps to pre-
vent stratification and disulfate the battery.
As batteries in a battery pack charge and dis-
charge over many cycles, cells may become
unbalanced. Cell unbalancing becomes more
common as batteries age. Equalization charg-
ing helps to prevent stratification and reduces
sulphates in the battery.
Charger charges at either a constant voltage,
or constant current, or a combination of con-
stant-current / constant voltage to 'Equalize'
Battery Cells in the battery.
This stage employs Timers in combination with
any combination of dv/dt, di/dt, dT/dt and maxi-
mum voltage.
Even if this stage is activated in a charge
MODE, it is not applied during every charge cy-
cle. For lithium and GEL batteries, Equalization
is not applied and cannot be manually selec-
ted.
Manual (intentional) Selection of this charge
stage, by the user, can be selected by de-
pressing and holding depressed the 'Menu Se-
lect Button' for 10 seconds WHILE A.C. Power
is applied. If the Menu Select Button is again
depressed and held depressed for 10 seconds,
this stage will toggle off.
NOTE: Only use this method to equalize US Battery
Wet Cell batteries. Only use this method if the charge
mode is set to 2.
The charge cycle in which this additional
Equalization Charge Stage will inject itself into
will be announced by either flashing the Red
6
Power-On LED or flashing the LCD Backlight,
continually throughout the ENTIRE charge cy-
cle. The flash will stop upon entry into the
Float/Maintenance Standby Stage.
6. FLOAT / MAINTENANCE STANDBY Charge
Stage:
Entry into this stage typically signifies that the
battery is FULLY charged and has a Green
LED 'Charged' indicator associated with it. On
an LCD display, the status will display as 'FLT'.
No further charging action occurs. However, all
batteries, regardless of chemistry, self-dis-
charge at a rate that is proportional to ambient
temperature meaning that if a battery sits on a
table completely disconnected from all loads, it
will self discharge over many months.
This charge stage, depending on the MODE
selected will either:
• Regulate at a low voltage level to sup-
ply a 'trickle current' to 'MAINTAIN' bat-
tery at full charge (prevent self dis-
charge).
• Disconnect itself from A.C. Power by
disabling the internal relay, and allow
the battery voltage to 'FLOAT' for 45
days, at which time, the charger will au-
tomatically re-initiate, an new charge cy-
cle and automatically reconnect to A.C.
Power.
• Re-start charging if the battery voltage
decays below a trigger voltage level.
If the charger is fitted with an internal A.C.
Connect/Disconnect relay, typically, the output
is allowed to 'FLOAT' and not regulated, which
prevents the consumption of utility provided
power.
During this stage, regardless of the use of an
A.C. Relay, the microprocessor continues to
monitor the battery and passage of time while
in this 'STANDBY' stage.
The charger may be left connected to battery
with the A.C. Power Removed. The amount of
drain from the battery is very minimal.
2200 YRM 2030