Buffer Time - Allen-Bradley DC-UPS Manual

Buffer Time

The buffer time (sometimes also called autonomy time) is the maximum time
for which the battery can maintain the required output current. The buffer
time mainly depends on the capacity and quality of the battery and the output
current in battery mode.
The following times are typical values for a new product and the aging effect
during operation is not included.
IMPORTANT • The following buffer times apply for a battery temperature from
• Due to long-term aging effects of batteries consider a buffer time
• The shown buffer times only apply for Rockwell Automation battery
• The buffer time is defined for a fully charged battery. The buffer time
Buffer Time
Battery
7 Ah
Size
Typ 1 d: 17 h: 40 m: 0 s
Typ 17 h: 13 m: 20s
Typ 5 h: 16 m: 40s
Typ 2 h: 32 m: 0 s
Typ 46 m: 30s
Typ 19 m: 11 s
Typ 10 m: 35 s
Typ 06 m: 45 s
Typ 4 s
Figure 11 - Buffer Time Definition
Battery
Charge
100%
80-90%
Battery
Mode
Rockwell Automation Publication 1606-RM008A-EN-P - November 2021
20...30°C and a buffer voltage setting of 22.5V. At higher voltages, the
buffer time is correspondingly shorter. Furthermore, with a wire length
of 2x1m (equal 1 m cord length) and a cross section of 4 mm
between the battery module and the DC-UPS.
reduction of 30...50% over time.
modules or from Rockwell Automation recommended batteries.
can be 10...20% shorter for buffer events, which start immediately after
the "Ready" signal becomes active.
12 Ah
2d: 22 h: 50 m: 0 s
1d: 6 h: 41 m: 40s
9 h: 51 m: 40s
5 h: 17 m: 59 s
2 h: 2 m: 55 s
46 m: 2 s
27 m: 34 s
16 m: 47 s
4 s
"Ready" signal threshold
Buffer Time
DC-UPS - 24V, 20 A, 480 W Reference Manual
2
(or AWG 12)
26 Ah Notes
6d: 19 h: 53 m: 20s At 22.5V, 0 A
2d: 20 h: 03 m: 20s At 22.5V, 0.2 A
21 h: 43 m: 20s At 22.5V, 1 A
11 h: 27 m: 30s At 22.5V, 2 A
4 h: 26 m: 40s At 22.5V, 5 A
2 h: 10 m: 0 s At 22.5V, 10 A
1 h: 17 m: 40s At 22.5V, 15 A
55 m: 00s At 22.5V, 20 A
4 s At 22.5V, 30 A
t
t
15