Cadex C4000 SERIES, User Manual

Page: 114 / 152

•
C-Code Tables
14. Voltage Limit (SLA)
•
CODE
undefined 0
undefined 1
undefined
2
2.20V/celf
3
2.25V/cell
4
2.30V/celf
5
2.35V1cell 6
2.40V/cell*
7
2.45V/cell
8
2.50V/cell
9
Table 11.14 '"Default
Full-charge detection
Charge time
The SLA charge method is based on voltage limit. (In
comparison, the NiCd and NiMH are based on current
limit). The C4000 charges the SLA battery at the
specified current until the set voltage threshold is
reached.
Recommended setting
The recommended voltage
limit is 2.30V to 2.45V per cell. Refer to the battery
manufacturer's
specifications for the recommended
setting. Observe the ambient temperature when
selecting the voltage limit.
Slow charge If a slow charge is desired, or the battery
temperature is likely to reached 30°C (86°F) or higher,
use 2.35V/cell.
Fast charge If a fast charge is desired and the battery
temperature will remain below 30°C (86°F), use
2.40 V/cel I.
Caution
Do not use a voltage limit of 2.40V/cell or
higher if the battery temperature is likely to reach 30°C
(86°F).
After the voltage limit is reached, the charge current
decreases. The decrease continues over several hours
until it levels off and forms a plateau. At this point, the
SLA battery is considered fully charged.
The charge time at the default C-Rate setting of 0.3C is
10 hours typical. The charge cycle is part of two stages:
•
Stage
1 Maximum charge current is applied until the voltage limit
Constant current charge
is reached. Typical time is 5 hours.
Stage 2
Charge current starts to drop. Typical time until the
. Topping charge
battery is fully saturated and the current reaches a low
plateau is 5 hours .
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