28 Rockwell Automation Publication 1606-RM003A-EN-P - March 2019
DC-UPS with Integrated Battery - 24V, 10 A
Other Effects on Service Life
• Overcharging and deep discharging shortens the service life and should be
avoided. Due to the single battery concept of the 1606-XLS240-UPSC,
the end-of-charge voltage is precisely set automatically avoiding
unnecessary aging effects.
• Charge retention is important to get the longest battery life. Stored
batteries that are not fully charged age faster than charged batteries.
Batteries that are not in use should be recharged at least once a year.
• Excessive float charge ripple across the battery has an effect of reducing life
and performance. The 1606-XLS240-UPSC does not produce such a
ripple voltage. This effect can be ignored when the battery is charged with
the 1606-XLS240-UPSC.
Prolonging Service Life
• Place the DC-UPS in a cool location. For example, near the bottom of the
control cabinet.
• Do not place the DC-UPS near heat generating devices.
• Do not store discharged batteries.
• Do not discharge the battery more than necessary. Set the buffer time
limiter to the required buffer time. The depth of the discharge reduces the
service life of the battery and limits the number of cycles. See Figure 28
.
Calculating the Service Life
Following is an example demonstrating calculating the service life and required
replacement cycle. Uses these parameters for the example:
• A 5 Ah battery with a design life of 3
…5 years is used (for example, a Yuasa
battery that is used for type 1606-XLSBAT5).
• The average ambient temperature is 30 °C (86 °F).
• One buffer event consumes approx. 25% of the achievable buffer time.
• One buffer event per day.
As shown in Figure 27
, curve A can expect to have a service life of 2-years at an
ambient temperature of 30 °C (86 °F). The number of discharging cycles is 2
years x 365 cycles that equals 730 cycles. As shown in Figure 28
, curve C has to be
used (only 25% of the battery capacity is required). 730 cycles have only a minor
influence in a battery degradation and can be ignored.
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