Operation
2–4
975-0401-01-01
Two-Stage Charging
The two-stage charging mode employs the following
sequence:
Bulk and Absorption
. It runs similar to the three-
stage sequence except that there is no float stage; after the
absorption stage the charger stops providing voltage and
current to the battery and enters a “rest or standby stage.”
Like the three-stage sequence, the charger will restart the
charging cycle in the Bulk stage if the lowest battery voltage
of the three banks drops below 12.5V (12 V chargers) or
25 V (24 V chargers) for 15 minutes. After 21 days, the
charger will automatically restart charging in order to refresh
the batteries.
Figure 2-3
Two-Stage Charging Process
Battery Voltage
Time
ABS
CC
ABS
CV
REST
(Standby)
ABS CV timeout
max 5 hrs
REST (Standby)
timeout max 21 days
Total ABS timeout
max 8 hrs
BULK
Vgas voltage
Vbat = Vgas
for 1 minute
GO TO BULK when
Vbat < 12.5 V for
15 minutes
Vbat = Vabs
for 1 minute
lout < 10% lrating
Charge
start
Start of
charging cycle
TC2 Series BattChg Owners Guide.book Page 4 Tuesday, July 1, 2008 11:55 PM
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