Reference Manual
All parameters are specified at 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time unless noted otherwise.
It is assumed that the input power source can deliver a sufficient output current.
8 Rockwell Automation Publication 1606-RM036A-EN-P — April 2014
Bulletin 1606 Switched Mode Power Supplies
9. Buer Time
The buer time depends on the capacity and performance of the battery as well as the load current. The diagram
below shows the typical buer times of the standard battery modules.
Buer time with battery module 1606-XLSBATASSY1 min. 19’12’’ At 5A output current *)
min. 5’42’’ At 10A output current *)
typ. 21’30’’ At 5A output current, see Fig. 9-1 **)
typ. 6’45’’ At 10A output current, see
Fig. 9-1 **)
Buer time with battery module 1606-XLSBATASSY2 min. 99’30’’ At 5A output current *)
min. 39’ At 10A output current *)
typ. 130’ At 5A output current, see Fig. 9-1 **)
typ. 55’ At 10A output current, see
Fig. 9-1 **)
*) Minimum value includes 20% aging of the battery and a cable length of 1.5m with a cross section of 2.5mm
2
between the
battery and the DC-UPS and requires a fully charged (min. 24h) battery.
**) Typical value includes 10% aging of the battery and a cable length of 0.3m with a cross section of 2.5mm
2
between the battery
and the DC-UPS and requires a fully charged (min. 24h) battery.
Fig. 9-1
Buer time vs. output current with the battery modules 1606-XLSBATASSY1 and 1606-XLSBATASSY2
Buer Current
515
2
4
6
8
10A
2010 25 30 35 45 550405 60 65 70 75 80 85
Buer Time (Minutes)
1
6
0
6
-X
LS
B
A
T
1
t
y
p
.
16
0
6-XL
SBA
T
2
1
2
V
7
A
h
b
a
t
t
er
y
1
2
V
2
6
A
h
b
a
t
t
e
r
y
120 150 210 240
300
Min.
180 27090
1
606
-X
L
SBA
T
2
t
y
p
.
90
The battery capacity is usually specied in amp-hours (Ah) for a 20h discharging event. The battery discharge is non-
linear (due to the battery chemistry). The higher the discharging current, the lower the appropriate battery capacity.
The magnitude of the reduction depends on the discharging current as well as on the type of battery. High current
battery types can have up to 50% longer buer times compared to regular batteries when batteries are
discharged in less than 1 hour.
High discharging currents do not necessarily mean high power losses as the appropriable battery capacity is reduced
with such currents. When the battery begins to recharge after a discharging event, the process is completed much
faster since only the energy which was taken out of the battery needs to be “replenished.”
For this reason, the buer time cannot be calculated using the Ah capacity value. The equation “l x t = capacity” in
Ah generally leads to incorrect results when the discharging current is higher than C20 (discharging current for 20h).
Study the battery datasheet and determine the expected buer time by using the example on the next page.
1606-XLSBAT1 typ.