Rockwell Automation 1606-XLS240-UPS Power Supply Reference Manual - Manual (Page 23)

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.
Rockwell Automation Publication 1606-RM036A-EN-P — April 2014 23
Bulletin 1606 Switched Mode Power Supplies
Example for calculating the service life and the required replacement cycle:
Parameters for the example:
A 7Ah battery with a design life of 3-5 years is used (e.g. Yuasa battery from the 1606-XLSBATASSY1 module)
The average ambient temperature is 30°C
One buffer event consumes approx. 25% of the achievable buffer time.
One buffer event per day
Calculation:
Ambient temperature influence:
According to Fig. 26-1 curve A, a 2-year service life can be expected at an ambient temperature of 30°C.
Number of discharging cycles: 2 years * 365 cycles = 730cycles in 2 years.
According to Fig. 26-2, curve C has to be used (only 25% of battery capacity is required). 730 cycles have only a
negligible influence in a battery degradation and can be ignored.
Result:
The battery shall be replaced after 2 years.
Please note that the battery degrading begins from the production date (check date code on the battery) which may
shorten the replacement intervals.
Fig. 26-1 Service life versus ambient
temperatures, typ *)
Fig. 26-2 Cell capacity degradation vs.
discharging cycles *)
0
120%
100%
40%
20%
Number of Discharging Cycles
80
60%
80%
Cell Capacity
Depth of
discharge
A: 100%
B: 50%
C: 30%
160 240 320 400 480
A
B
C
200 400 600 800 1000 1200
XLSBAT2
XLSBAT1
20°C
10
30°C 35°C 40°C 45°C
8
6
4
2
Ambient Temperature
25°C
1
3
5
7
9
Service Life in Years
Design Life
of Battery
A: 3-5 Years
B: 6-9 Years
C: 10-12 Years
A
B
C
*) datasheet figures from battery manufacturer
26.2. Parallel and Serial Use
Do not use the DC-UPS in parallel to increase the output power. However, two units of the DC-UPS can be paralleled
for 1+1 redundancy to gain a higher system reliability.
Do not use batteries in parallel, since the battery quality test may generate an error message.
Do not connect two or more units in series for higher output voltages.
Do not connect two or more units in a row to get longer hold-up times.